Diagnostic Trouble Code (DTC) Charts

Diagnostic Trouble Code (DTC) Charts Note: Before proceeding to the Pinpoint Test, refer to the Diagnostic Trouble Code (DTC) Descriptions for additional information to assist in diagnosis. 6.0L Diesel DTCs Chart Diagnostic Trouble Code (DTC) Application Continuous Memory 111 ALL No errors detected 112 ALL GO to Powertrain Control Module Power (PCM PWR) 113 ALL GO to Powertrain Control Module Power (PCM PWR) 114* ALL GO to Engine Coolant Temperature (ECT) Sensor 115* ALL GO to Engine Coolant Temperature (ECT) Sensor 121* ALL GO to Manifold Absolute Pressure (MAP) Sensor 122* ALL GO to Manifold Absolute Pressure (MAP) Sensor 123* ALL GO to Manifold Absolute Pressure (MAP) Sensor 124* ALL GO to Injection Control Pressure (ICP) Sensor 125* ALL GO to Injection Control Pressure (ICP) Sensor 131* ALL GO to Accelerator Pedal Position Sensor and Idle Validation Switch (APS/IVS) 132* ALL GO to Accelerator Pedal Position Sensor and Idle Validation Switch (APS/IVS) 133* ALL GO to Accelerator Pedal Position Sensor and Idle Validation Switch (APS/IVS) 134* ALL GO to Accelerator Pedal Position Sensor and Idle Validation Switch (APS/IVS) 135* ALL GO to Accelerator Pedal Position Sensor and Idle Validation Switch (APS/IVS) 141 ALL GO to Vehicle Speed Sensor (VSS) 142 ALL GO to Vehicle Speed Sensor (VSS) 143 ALL GO to Camshaft Position (CMP) Sensor 145 ALL GO to Camshaft Position (CMP) Sensor 146 ALL GO to Crankshaft Position (CKP) Sensor 147 ALL GO to Crankshaft Position (CKP) Sensor 151* ALL GO to Barometric Absolute Pressure (BAP) Sensor 152* ALL GO to Barometric Absolute Pressure (BAP) Sensor 154 ALL GO to Intake Air Temperature (IAT) Sensor 155 ALL GO to Intake Air Temperature (IAT) Sensor

Diagnostic Trouble Code (DTC) Charts 6.0L Diesel DTCs Chart Diagnostic Trouble Code (DTC) Application Continuous Memory 161* ALL GO to Manifold Air Temperature (MAT) Sensor 162* ALL GO to Manifold Air Temperature (MAT) Sensor 163* ALL GO to Exhaust Gas Recirculation (EGR) Actuator 164* ALL GO to Exhaust Gas Recirculation (EGR) Actuator 211* ALL GO to Engine Oil Pressure (EOP) Sensor 212* ALL GO to Engine Oil Pressure (EOP) Sensor 215 ALL GO to Vehicle Speed Sensor (VSS) 225 ALL GO to Engine Oil Pressure (EOP) Sensor 231 ALL GO to Data Link 236 ALL GO to Engine Coolant Level (ECL) Sensor 241 ALL GO to Injection Pressure Regulator (IPR) 246 ALL GO to Engine Fan Control (EFAN) 251 ALL GO to Glow Plug Control (GPC) Circuit 256 ALL See Note 11. 261 ALL GO to Variable Geometry Turbocharger (VGT) Actuator 264 ALL GO to Exhaust Gas Recirculation (EGR) Actuator 267 ALL GO to Engine Crank Inhibit (ECI) System 311* ALL GO to Engine Oil Temperature (EOT) Sensor 312* ALL GO to Engine Oil Temperature (EOT) Sensor 313 ALL Refer to Section 3 Symptom Charts. 314 ALL Refer to Section 3 Symptom Charts. 315* ALL Refer to Section 3 Symptom Charts. 316 ALL See Note 9. 321 ALL Refer to Section 3 Symptom Charts. 322 ALL Refer to Section 3 Symptom Charts. 323 ALL See note 10. 324 ALL See Note 3. 325 ALL Refer to Section 3 Symptom Charts. 331* ALL GO to Injection Control Pressure (ICP) System 332* ALL GO to Injection Control Pressure (ICP) Sensor 333* ALL GO to Injection Control Pressure (ICP) System

Diagnostic Trouble Code (DTC) Charts 6.0L Diesel DTCs Chart Diagnostic Trouble Code (DTC) Application Continuous Memory 334 ALL GO to Injection Control Pressure (ICP) System 335 ALL GO to Injection Control Pressure (ICP) System 341* ALL GO to Exhaust Back Pressure (EBP) Sensor 342* ALL GO to Exhaust Back Pressure (EBP) Sensor 343* ALL GO to Air Management System 344* ALL GO to Exhaust Back Pressure (EBP) Sensor 345 ALL GO to Air Management System 346 ALL GO to Air Management System 351 ALL GO to Air Management System 353 ALL GO to Air Management System 354 ALL GO to Air Management System 355 ALL GO to Air Management System 361 ALL GO to Air Management System 365* ALL GO to Air Management System 366* ALL GO to Air Management System 367* ALL GO to Air Management System 421-428 ALL GO to Injector Drive Circuits 431-438 ALL GO to Injector Drive Circuits 451-458 ALL GO to Injector Drive Circuits 523 ALL GO to Injection Driver Module Power (IDM PWR) 525* ALL GO to Injection Driver Module Power (IDM PWR) 533 ALL GO to Injection Driver Module Power (IDM PWR) 534 ALL GO to Injection Driver Module Power (IDM PWR) 543* ALL GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications 551 ALL GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications 552 ALL GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications 553 ALL GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications 554 ALL GO to Powertrain Control Module (PCM)/Injector Driver Module (IDM) Communications 571-578* ALL See Note 4.

Diagnostic Trouble Code (DTC) Charts 6.0L Diesel DTCs Chart Diagnostic Trouble Code (DTC) Application Continuous Memory 613* ALL See Note 5. 614* ALL See Note 6. 621* ALL See Note 7. 622* ALL See Note 7. 623* ALL See Note 6. 624 ALL See Note 7. 626 ALL GO to Powertrain Control Module Power (PCM PWR) 631 ALL See Note 8. 632 ALL See Note 8. 655 ALL See Note 7. 661 ALL See Note 8. 664 ALL See Note 7. 665 ALL See Note 8. (1) Note 1: * Indicates amber ENGINE indicator on when a Diagnostic Trouble Code (DTC) is set. (2) Note 2: ** Indicates red ENGINE indicator on if the Engine Warning Protection System (EWPS) is enabled and a DTC is set. (3) Note 3: DTC 324 does not indicate any system or circuit fault. Diagnostic tests are not required for this DTC. (4) Note 4: When DTCs are set for cylinder balance, perform all Performance Diagnostics Tests. Refer to Section 4. (5) Note 5: Install correct PCM or IDM. (6) Note 6: Check engine family rating code (EFRC) for the current PCM strategy. Reprogram the PCM or change the EFRC as required. Refer to Section 2. (7) Note 7: Reprogram the PCM. Refer to Section 2. (8) Note 8: Install a new PCM. (9) Note 9: DTC 316 only indicates the engine has not been able to reach operating temperature. It does not indicate a circuit fault. Refer to the Workshop Manual for cooling system diagnostics. (10) Note 10: If coolant level is correct, GO to Engine Coolant Level (ECL) Sensor (11) Note 11: Refer to the Workshop Manual for cooling system diagnostics.

111 No Errors PCM No errors detected No errors detected Detected 112 Electrical System The PCM internally DTC 112 is set when the The PCM monitors the Voltage B+ Out Of Range monitors battery voltage. PCM detects a generator VREF voltage and will High When the PCM output greater than 23 adjust the signal values for continuously receives volts at pin X3-3 for more the sensors that use VREF greater than 23 volts a than 0.5 seconds. for operation. If a sensor or DTC will be set. DTC 112 can be set circuit pulls VREF lower when jump starting the than 5 volts, the PCM may engine and additional set out of range high DTCs voltage is introduced. for the sensors that Incorrect external battery operate on VREF (APS, connections can cause BAP, B+, and VSS). the voltage increase. If the condition causing DTC 112 is intermittent, the code will change from active to inactive status. DTC 112 will not cause the amber ENGINE indicator to turn on. 113 Electrical System The PCM internally DTC 113 can be set by a DTC 113 is set when the Voltage B+ Out Of Range monitors battery voltage. defective generator or PCM detects less than 7.0 Low When the PCM PCM power relay, volts at pin X3-3 for more continuously receives less discharged batteries, or than 0.5 seconds. than 7.0 volts, a DTC will be set. increased resistance in the battery feed circuits. If the condition causing DTC 113 is intermittent, the code will change from active to inactive status. DTC 113 will not cause the amber ENGINE indicator to turn on.

114 Engine Coolant The PCM continuously DTC 114 is set by the Signal voltage was less Temperature Signal Out monitors the signal of the PCM when the ECT than 0.127 volts for more Of Range Low ECT sensor to determine if signal is less than 0.127 than 0.35 seconds. the signal is within an volts for more than 0.35 expected range. If the PCM seconds. detects an out of range DTC 114 can set due to high or low, the PCM will a short to ground in the ignore the ECT signal and signal circuit or a assume an engine coolant defective sensor. temperature of -34 C When DTC 114 is set the (-29 F) for starting and amber ENGINE indicator 82 C (180 F) for engine is illuminated. running conditions. When this occurs, the EWPS, CAP, IST, cold idle advance, and coolant compensation features are disabled. 115 Engine Coolant The PCM continuously DTC 115 is set by the Signal voltage was greater Temperature Signal Out monitors the signal of the PCM when the ECT than 4.6 volts for more Of Range High ECT sensor to determine if signal is greater than 4.6 than 0.35 seconds. the signal is within an volts for more than 0.35 expected range. If the PCM seconds. detects an out of range DTC 115 can set due to high or low, the PCM will an open signal or ground ignore the ECT signal and circuit, a short to a assume an engine coolant voltage source, or a temperature of -34 C defective sensor. (-29 F) for starting and When DTC 115 is set the 82 C (180 F) for engine amber ENGINE indicator running conditions. When is illuminated. this occurs, the EWPS, CAP, IST, cold idle advance, and coolant compensation features are disabled 121 Intake Manifold The PCM will ignore the DTC 121 can be set due DTC 121 is set by the Absolute Pressure Signal MAP signal when the to a sensor signal wire PCM when the MAP signal Out Of Range High signal is detected to be out short to VREF or B+ or a is greater than 4.9 volts for of range or an incorrect defective MAP sensor more than 0.4 seconds. value is read. The engine When DTC 121 is active will continue to operate the amber ENGINE based on estimated values. indicator is illuminated. 122 Intake Manifold The PCM will ignore the DTC 122 can be set due DTC 122 is set by the Absolute Pressure Signal MAP signal when the to a sensor signal circuit PCM when the MAP signal Out Of Range Low signal is detected to be out open or shorted to is less than 0.039 volts for of range or an incorrect ground or a defective more than 0.4 seconds. value is read. The engine MAP sensor. DTC 122 will continue to operate based on estimated values. can also be set due to an extremely restricted CAC/intake system. When DTC 122 is active the amber ENGINE indicator is illuminated.

123 Intake Manifold The PCM will ignore the DTC 123 can be set due DTC 123 is set by PCM Absolute Pressure Signal MAP signal when the to a restricted or plugged when the MAP signal is In-Range Fault signal is detected to be out sensor inlet, VREF greater than 120 kpa (2 of range or an incorrect shorted to a voltage psi) absolute at low idle. value is read. The engine source greater than 5.5 will continue to operate based on estimated values. volts, or a defective MAP sensor. When DTC 123 is active the amber ENGINE indicator is illuminated. 124 Injection Control The PCM continuously DTC 124 can be set due DTC 124 is set by the Pressure Signal Out Of monitors the signal of the to an open or short to PCM if signal voltage is Range Low ICP sensor to determine if ground on the signal less than 0.039 volts for the signal is within an circuit, a defective sensor more than 0.1 seconds. expected range. If the PCM or an open VREF circuit detects a higher or lower or a VREF circuit short to voltage than expected, the ground. PCM will set a DTC, When DTC 124 is active illuminate the amber the amber ENGINE ENGINE indicator, ignore indicator is illuminated. the ICP sensor signal, and use a preset value based on engine operating conditions. 125 Injection Control The PCM continuously DTC 125 can be set due DTC 125 is set by the Pressure Signal Out Of monitors the signal of the to an open signal ground PCM if the signal voltage is Range High ICP sensor to determine if circuit, short to a voltage greater than 4.9 volts for the signal is within an source on the ICP signal more than 0.1 seconds. expected range. If the PCM circuit, or a defective detects a higher or lower sensor. voltage than expected, the When DTC 125 is active PCM will set a DTC, the amber ENGINE illuminate the amber indicator is illuminated. ENGINE indicator, ignore the ICP sensor signal, and use a preset value based on engine operating conditions.

131 APS Signal Out Of The PCM continuously Possible causes include DTC 131 is set if the PCM Range Low monitors the APS/IVS a short to ground or an detects voltage less than circuits for expected open in the APS signal 0.147 volts. voltages. It also compares circuit. the APS and IVS signals DTC 131 can be set due for conflict. If the PCM to a short to ground or detects an APS signal out an open VREF or signal of range low, the engine circuits. If the condition will ignore the APS signal and operate at low idle. causing DTC 131 is intermittent and the condition is no longer present, the code will become inactive and normal engine operation will resume. When DTC 131 is active the amber ENGINE indicator is illuminated. 132 APS Signal Out Of The PCM continuously DTC 132 can be set due DTC 132 is set if the PCM Range High monitors the APS/IVS to a short to VREF or B+ detects a voltage greater circuits for expected in the APS signal circuit. than 4.55 volts. The PCM voltages. It also compares When DTC 132 is active monitors voltage on VREF the APS and IVS signals the amber ENGINE A and will adjust signal for conflict. If the PCM indicator is illuminated. values for the sensors that detects an APS signal out use VREF A for operation. of range high, the engine If a sensor or circuit pulls will ignore the APS signal and operate at low idle. VREF less than 5 volts, the PCM may set out of range high DTCs for the sensors that operate on VREF B (APS, BAP, B+, and VSS). 133 APS Signal In The PCM checks the If the IVS signal is DTC 133 is caused by Range DTC voltage output of the APS changing and the APS intermittent conditions. The by comparing the APS signal is constant, the DTC will remain active until signal with the IVS signal. PCM assumes the APS the vehicle has been APS and IVS signals can is the conflict source and shutdown and restarted. disagree in two cases: sets DTC 133. The The DTC does not recover The APS signal indicates engine rpm is restricted without cycling the key the pedal is pressed to idle. switch. down to accelerate, but When DTC 133 is active the IVS signal indicates the amber ENGINE idle position. indicator is illuminated. The APS signal indicates the pedal has been released to allow the engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC.

134 APS Signal And The PCM checks the If neither the APS or IVS DTC 134 is caused by IVS Disagree voltage output of the APS is changing, or both are intermittent conditions. The by comparing the APS changing, or the PCM DTC will remain active until signal with the IVS signal. cannot determine the the vehicle has been APS and IVS signals can DTC in specified time, shutdown and restarted. disagree in two cases: DTC 134 is set and The DTC does not recover The APS signal indicates engine rpm is restricted without cycling the key the pedal is pressed to idle. switch. down to accelerate, but When DTC 134 is active the IVS signal indicates the amber ENGINE idle position. indicator is illuminated. The APS signal indicates the pedal has been released to allow the engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC. 135 Idle Validation The PCM checks the If the APS is changing DTC 135 is caused by Switch Circuit Fault voltage output of the APS but IVS is constant, the intermittent conditions. The by comparing the APS PCM assumes the IVS is DTC will remain active until signal with the IVS signal. the conflict source and the vehicle has been APS and IVS signals can sets DTC 135. In this shutdown and restarted. disagree in two cases: case the PCM limits the The DTC does not recover The APS signal indicates APS signal to a lower without cycling the key the pedal is pressed value that provides less switch. down to accelerate, but than full rpm, but does the IVS signal indicates not limit engine rpm to idle position idle. The APS signal indicates When DTC 135 is active the pedal has been the amber ENGINE released to allow the indicator is illuminated. engine to return to idle, but the IVS signal indicates off-idle position of the pedal. If the PCM detects either of the above conditions, the PCM attempts to isolate the source of conflict and set the appropriate DTC.

141 Vehicle Speed The PCM performs DTC 141 is set by the The PCM will not set DTCs Sensor Signal Out Of diagnostic checks on the PCM when an out of for VSS circuit failure for Range Low VSS circuit when the range low condition is vehicles equipped with engine is operating at 0 detected in the VSS Allison MD (WTEC) and mph. The PCM transmits a circuit. 2000 series transmissions. voltage signal on the VSS When DTC 141 is active For vehicles equipped with circuit and determines if the amber ENGINE MD transmissions, the return voltage is out of indicator is not diagnose the range high or low. When a illuminated. communication circuit fault condition is detected, (CAN 1) between the the PCM disables the engine and transmission cruise control and power module. takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. 142 Vehicle Speed The PCM performs DTC 142 is set by the The PCM monitors voltage Sensor Signal Out Of diagnostic checks on the PCM when an out of on VREF A and will adjust Range High VSS circuit when the range high condition is signal values for the engine is operating at 0 detected in the VSS sensors that use VREF A mph. The PCM transmits a circuit. for operation. If a sensor or voltage signal on the VSS When DTC 142 is active circuit pulls VREF less than circuit and determines if the amber ENGINE 5 volts, the PCM may set the return voltage is out of indicator is not out of range high DTCs for range high or low. When a illuminated. the sensors that operate on fault condition is detected, VREF B (APS, BAP, B+, the PCM disables the and VSS). cruise control and power takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. 143 Incorrect CMP An inactive CMP signal DTC 143 is set by the An inactive CMP signal will Signal Signature during cranking is PCM when the CMP cause a no start condition. detectable by the PCM. transition occurs at the During engine cranking the wrong CKP location. PCM monitors the CKP DTC 143 can be set due signal and Injection Control to a mistimed CMP to Pressure (ICP) to verify the CKP signal, electrical engine is rotating. If the noise in the CMP circuit, CMP signal is inactive or a defective CMP during this time a DTC will sensor. be set. Electrical noise can also be detected by the PCM. When the level is sufficient to affect engine operation, a corresponding DTC will be set.

145 CMP Signal An inactive CMP signal DTC 145 is set by the An inactive CMP signal will Inactive during cranking is PCM when the CMP cause a no start condition. detectable by the PCM. signal is inactive, the During engine cranking the CKP signal is active, and PCM monitors the CKP the ICP has increased. signal and Injection Control DTC 145 can be set due Pressure (ICP) to verify the to an open short to engine is rotating. If the ground or open voltage CMP signal is inactive source in the CMP during this time a DTC will circuit. A defective sensor be set. Electrical noise can can cause DTC 145 to also be detected by the be set. PCM. When the level is sufficient to affect engine operation, a corresponding DTC will be set. 146 CKP Signal An inactive CKP signal DTC 146 is set by the An inactive CKP signal will Inactive during cranking is PCM when no CKP cause a no start condition. detectable by the PCM. signal is detected while During engine cranking the the CMP signal is active PCM monitors the CMP and ICP has increased. signal and injection control DTC 146 can be set due pressure to verify the to an open short to engine is rotating. If the ground or voltage source CKP signal is inactive in the CKP circuit. A during this time a DTC will defective CKP sensor be set. Electrical noise can can also set DTC 146. also be detected by the PCM, if the level is sufficient to effect engine operation, a corresponding DTC will be set. 147 Incorrect CKP An inactive CKP signal DTC 147 is set by the An inactive CKP signal will Signal Signature during cranking is PCM when the CKP cause a no start condition. detectable by the PCM. signal has too few or During engine cranking the many transitions per PCM monitors the CMP engine rotation. signal and injection control DTC 147 can be set due pressure to verify the to an electrical noise in engine is rotating. If the the CKP circuit or a CKP signal is inactive defective CKP sensor. during this time a DTC will be set. Electrical noise can also be detected by the PCM. If the level is sufficient to affect engine operation, a corresponding DTC will be set.

151 Barometric When the PCM detects the DTC 151 is set when the The PCM monitors voltage Absolute Pressure Signal BAP voltage signal out of BAP signal is greater on VREF A and will adjust Out Of Range High range high, the PCM will than 4.95 volts for more signal values for the ignore the BAP signal and than 0.5 seconds. sensors that use VREF A use the Manifold Absolute DTC 151 can be set for operation. If a sensor or Pressure (MAP) signal when the signal circuit is circuit pulls VREF less than generated at low idle as an shorted to VREF or B+. 5 volts, the PCM may set indication of barometric A defective BAP sensor out of range high DTCs for pressure. When a MAP can also set DTC 151. the sensors that operate on fault is detected, the BAP When DTC 151 is set the VREF B (APS, BAP, B+, signal will default to amber ENGINE indicator and VSS). barometric pressure at sea is illuminated. level, 100.24 kpa (29.6 in Hg). 152 Barometric When the PCM detects the DTC 152 can be set DTC 152 is set when the Absolute Pressure Signal BAP voltage signal out of when the signal circuit is BAP signal is less than 1.0 Out Of Range Low range low, the PCM will shorted to ground or volts for more than 0.5 ignore the BAP signal and open. If VREF is shorted seconds. use the Manifold Absolute to ground, DTC 152 can Pressure (MAP) signal be set. A defective BAP generated at low idle as an sensor can set DTC 152. indication of barometric When DTC 152 is set the pressure. When a MAP amber ENGINE indicator fault is detected, the BAP is illuminated. signal will default to barometric pressure at sea level, 100.24 kpa (29.6 in Hg). 154 Inlet Air When the PCM detects an DTC 154 can be set due DTC 154 is set by the Temperature Signal Out IAT signal out of range to a short to ground in PCM if signal voltage is Of Range Low low, the PCM will ignore the signal circuit or a less than 0.127 volts for the IAT signal and assume defective IAT sensor. more than 0.35 seconds. an ambient temperature of When DTC 154 is set, When DTC 154 is set, the 25 C (77 F). the amber ENGINE PCM will default to 25 C indicator is illuminated. (77 F) for starting 155 Inlet Air When the PCM detects an DTC 155 can set due to DTC 155 is set by the temperature Signal Out IAT signal out of range an open signal or ground PCM if signal voltage is Of Range High high, the PCM will ignore circuit, a short to a greater than 4.6 volts for the IAT signal and assume voltage source, or a more than 0.35 seconds. an ambient temperature of defective sensor. When DTC 155 is set, the 25 C (77 F). When DTC 155 is active, PCM will default to a value the amber ENGINE of 25 C (77 F) for starting. indicator is illuminated. 161 Manifold Air The PCM continuously DTC 161 can be set due DTC 161 is set by the Temperature Signal Out monitors the signal of the to a short to ground in PCM when the signal Of Range Low MAT sensor to determine if the signal circuit or a voltage is less than 0.098 the signal is within an defective sensor. volts for more than 0.35 expected range. If the PCM When DTC 161 is active seconds. detects the signal voltage the amber ENGINE is higher or lower than indicator is illuminated. expected, the PCM will set a DTC.

162 Manifold Air The PCM continuously DTC 162 can be set due DTC 162 is set by PCM Temperature Signal Out monitors the signal of the to an open signal or when the signal voltage is Of Range High MAT sensor to determine if ground circuit, short to a greater than 4.58 volts for the signal is within an voltage source, or a more than 0.35 seconds. expected range. If the PCM defective sensor. detects the signal voltage When DTC 162 is active is higher or lower than the amber ENGINE expected, the PCM will set indicator is illuminated. a DTC. 163 Exhaust Gas The EGRP sensor is DTC 163 is set by the The EGR actuator can be Recirculation Valve calibrated to zero position PCM when the EGRP tested for a stuck or Position Signal Out Of each time the key is cycled voltage is greater than sticking valve by Range Low to allow compensation if 0.3 volts for more than performing an Output State carbon deposits develop on 0.35 seconds. Low Test while monitoring the valve. If the deposits DTC 163 can be set due EGRP percentage. Refer to get so heavy that the to an open or short to Section 4 Performance position is out of range to ground on the signal zero, a DTC will be set, the circuit, a defective sensor Diagnostics. valve will close. When the or an open VREF circuit EGRP signal voltage is or a VREF circuit short to detected out of range high ground. or low, the PCM will cause When DTC 163 is active the engine to ignore the the amber ENGINE EGRP signal and the EGR indicator is illuminated. valve will close. 164 Exhaust Gas The EGRP sensor is DTC 164 is set by the The EGR actuator can Recirculation Valve calibrated to zero position PCM when the EGRP tested for a stuck or Position Signal Out Of each time the key is cycled voltage is greater than sticking valve by Range High to allow compensation if 4.5 volts for more than performing an Output State carbon deposits develop on 0.35 seconds. Low Test while monitoring the valve. If the deposits DTC 164 can be set due EGRP percentage. Refer to get so heavy that the to an open or short to Section 4 Performance position is out of range to ground on the signal zero, a DTC will be set, the circuit, a defective sensor Diagnostics. valve will close. When the or an open VREF circuit EGRP signal voltage is or VREF short to ground. detected out of range high When DTC 164 is active or low, the PCM will cause the amber ENGINE the engine to ignore the indicator is illuminated. EGRP signal and the EGR valve will close. 211 Engine Oil When the EOP signal DTC 211 can be set due DTC 211 is set by the Pressure Signal Out Of voltage is detected out of to an open or short to PCM when the EOP signal Range Low range low, the PCM will ground on the signal is less than 0.039 volts for cause the engine to ignore circuit, a defective sensor more than 0.35 seconds. the EOP signal and disable or an open VREF circuit the Engine Warning and Protection System (EWPS). or VREF short to ground. When DTC 211 is active the amber ENGINE indicator is illuminated.

212 Engine Oil When the EOP signal DTC 212 can be set due DTC 212 is set by the Pressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EOP signal Range High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts for cause the engine to ignore source on the ICP signal more than 0.35 seconds. the EOP signal and disable circuit, or a defective the Engine Warning and Protection System (EWPS). sensor. When DTC 212 is set the amber ENGINE indicator is illuminated. 215 Vehicle Speed The PCM performs DTC 215 is set by the The PCM will not set DTCs Sensor Signal Frequency diagnostic checks on the PCM when the PCM for VSS circuit failure for Out Of Range High VSS circuit when the detects a VSS signal vehicles equipped with engine is operating at 0 greater than 4365 Hz. Allison MD (WTEC) and mph. The PCM transmits a 2000 series transmissions. voltage signal on the VSS Vehicles equipped with MD circuit and determines if transmissions only the return voltage is out of diagnose the range high or low. When a communication circuit fault condition is detected, (CAN 1) between the the PCM disables the engine and transmission cruise control and power module. takeoff. If the road speed limiting option is enabled, the PCM will limit engine rpm for all gears. 225 EOP Sensor When the EOP signal DTC 225 is set by the KOEO Engine oil pressure Signal In Range Fault voltage is detected out of PCM when the EOP is greater than 15 psi. range high, the PCM will signal voltage is higher cause the engine to ignore than expected with the the EOP signal and disable key ON and the engine the Engine Warning and OFF. Protection System (EWPS). DTC 225 can be set due to a biased circuit or a defective EOP sensor. When DTC 225 is active the amber ENGINE indicator is illuminated.

231 Data Communication The PCM continuously DTC 231 is set when the Vehicles equipped with the Link Error monitors the datalink for an PCM cannot access the Allison WTEC transmission open, short or intermittent datalink. When this may display DTC 231 connection. If an active occurs, data cannot be when attempting to DTC occurs on the retrieved using the scan program the PCM. The datalink, the diagnostic tool. DTCs can only be WTEC controller must be software will not display retrieved using the cruise disconnected when correct data. control feature. programming the engine DTC 231 can be set PCM. when the any of the following conditions occur: Defective device (transmission controller or anti-lock brake controller) is connected to the bus and pulls signal to ground. Number of devices exceeds limit Defective PCM When DTC 231 is active the amber ENGINE indicator is not illuminated. 236 ECL Switch Circuit The PCM continuously DTC 236 can be set Signal voltage was greater Fault monitors the ECL circuit for when a high resistance than 3.4 volts or less than in-range faults. The PCM connection or intermittent 4.3 volts more than 2.0 does not detect open or short to ground in the seconds. short circuits in the ECL circuit exists. system. When the PCM DTC 236 will not cause detects an in-range fault, DTC 236 will be set. the red ENGINE indicator to illuminate. If the condition is intermittent, the DTC will be logged as inactive.

241 Injection Control An open or short to ground DTC 241 is set by the Output Circuit Check Pressure Regulator in the EGR control circuit PCM when the OCC test detected indicates high or Output Circuit Check can be detected by an on has failed after the low resistance in circuit. (OCC) Self-test Failed demand output circuit KOEO Standard test has check during KOEO been run. Standard tests. If there is a DTC 241 can be set circuit fault detected a DTC when a poor connection will be set. When the to the IPR solenoid or engine is running, the PCM defective IPR coil exists. can detect if the injection When DTC 241 is set the control pressure is equal to engine will not run and the desired pressure. the amber ENGINE When the measured indicator will not be injection control pressure illuminated. does not compare to the desired pressure, the PCM will ignore the measured ICP signal and control the engine with the desired value. 246 Engine Fan Output An open or short to ground DTC 246 is set by the Before diagnosing, verify Circuit Check (OCC) in the EFAN can be PCM only during the the PCM is programmed Self-test Failed detected by the PCM KOEO Standard test. correctly. Verify the vehicle during an on-demand During this test the PCM has an electronic fan. engine standard test. The performs an output circuit IAT and ECT are test that momentarily monitored continuously. If a enables the EFAN DTC is detected in the IAT solenoid and measures or ECT, the EFAN control the voltage drop across is disabled and the engine the relay fan is on all the time. 251 Glow Plug Control An open or short to ground DTC 251 can be set for Glow plug and glow plug Output Circuit Check in the glow plug relay an open or shorted GPC harness problems cannot (OCC) Self-test Failed circuit can be detected by signal circuit, an open be detected by the PCM. an on demand output feed circuit, or an open circuit check performed glow plug relay coil. during the KOEO Standard tests. When a circuit fault is detected, a DTC will be set. 256 Radiator Shutter A fault in the Radiator DTC 256 can be set RSE output circuit check Enable Output Circuit Shutter Enable (RSE) when an open, short to a self-test failed. Check (OCC) Self-test circuit can be detected by voltage source or short to Failed an on demand output ground in the RSE circuit circuit check during KOEO Standard test. exists. DTC 256 can be set due to a defective relay.

261 Variable Geometry An open or short to ground DTC 261 can be set DTC 261 can be set when Turbo Output Circuit in the VGT control circuit when an open or short to a poor connection to the Check (OCC) Self-test can be detected by an on ground in the VGT VGT solenoid exists. Failed demand output circuit control circuit or a check during KOEO defective VGT coil exists. Standard tests. If there is a circuit fault detected a DTC will be set. When the engine is running, the PCM can detect if the exhaust back pressure is equal to the desired pressure. When the measured exhaust back pressure does not compare to the desired pressure, the PCM will ignore the measured EBP signal and will control the engine with the desired value. 264 Exhaust Gas An open or short to ground DTC 264 can be set due EGR output circuit check Recirculation Output in the EGR control circuit to open or short to self-test failed. Circuit Check (OCC) can be detected by an on ground, short to a Self-test Failed demand output circuit voltage source in the check during KOEO EGR control circuit, or a standard test. If there is a defective coil. circuit fault detected a DTC will be set. 267 Engine Crank When the on demand DTC 267 can be set due If the engine cranks when Inhibit Output Circuit engine on standard test is an open or short to the start switch is engaged, Check (OCC) Self-test performed, an open or ground on the coil side of check for failed ECI relay Failed short to ground can be the ECI relay. or problems with the PCM detected on the coil side of or PCM wiring harness. the ECI relay. 311 Engine Oil The EOT sensor provides DTC 311 can be set due DTC 311 is set by the Temperature Signal Out a feedback signal to the to a sensor signal wire PCM when the EOT signal Of Range Low PCM indicating engine oil short to ground or a is less than 0.2 volts for temperature. The PCM defective EOT sensor. more than 0.35 seconds. monitors the EOT signal to When DTC 311 is active control fuel quantity and the amber ENGINE timing throughout the indicator is illuminated. operating range of the engine. During engine operation, if the PCM recognizes that the EOT signal is lower or higher than the expected value it will set a DTC.

312 Engine Oil The EOT sensor provides DTC 312 can be set due DTC 312 is set by the Temperature Signal Out a feedback signal to the to a signal or ground PCM when the EOT signal Of Range High PCM indicating engine oil circuit open, a short to a is greater than 4.8 volts for temperature. The PCM voltage source, or a more than 0.35 seconds. monitors the EOT signal to defective EOT sensor. control fuel quantity and When DTC 312 is active timing throughout the the amber ENGINE operating range of the indicator is illuminated. engine. During engine operation, if the PCM recognizes that the EOT signal is lower or higher than the expected value it will set a DTC. 313 Engine Oil DTC 313 is set by the DTC 313 can be set due Compare the actual oil Pressure Below Warning PCM when the oil to a defective sensor pressure to the reading on Level pressure has dropped sending an incorrect the data list of the scan below the warning level. signal. Low oil pressure tool. The specifications for the due to defective warning level are : mechanical components 34 kpa (5.0 psi) @ 700 will also set DTC 313. rpm The PCM illuminates the 69 kpa (10.0 psi) @ red ENGINE indicator 1400 rpm and sounds an audible 138 kpa (20.0 psi) @ alarm. 2000 rpm 314 Engine Oil DTC 314 is set by the DTC 314 can be set due Compare the actual oil Pressure Below Critical PCM when the oil to a defective sensor pressure to the reading on Level pressure has dropped sending an incorrect the data list of the scan below the critical level. signal. Low oil pressure tool. The specification for the due to defective critical level is: mechanical components 14 kpa (2.0 psi) @ 700 will also set DTC 314. rpm The PCM illuminates the 34 kpa (5.0 psi) @ red ENGINE indicator 1400 rpm and sounds an audible 152 kpa (12.0 psi) @ alarm. 2000 rpm 315 Engine Speed DTC 315 is set by the DTC 315 can be set due The engine hours and Above Warning level PCM when the engine rpm to any of the following miles of the last two over has exceeded 3350 rpm. conditions: speed occurrences will be Excessive engine recorded in the Engine speed in an unintended Event Log. downshift. Steep acceleration downhill without correct brake application. External fuel source being ingested into air intake system. When DTC 315 is active the amber ENGINE indicator is illuminated.

316 Engine Coolant DTC 316 is set if the DTC 316 can be set due DTC 316 only indicates the Temperature Unable To engine does not reach to any of the following engine has not been able Reach Commanded Set operating temperature. conditions: to reach operating Point DTC 316 will only be set Extended idle time. temperature. It does not with engines that have Cold ambient indicate an electronic fault. cold ambient protection temperatures (may (CAP) strategy enabled. require use of winter DTC 316 is set after the front). engine has run for more Thermostat stuck in than 120 minutes and open position. has not exceeded the Incorrectly plumbed following specifications cooling system for engine coolant (thermostat bypassed). temperature: Fan clutch locked on. Manual transmission 65 C (149 F) Automatic transmission 60 C (140 F) 321 Engine Coolant DTC 321 is set by the The PCM illuminates the The PCM will log the Temperature Above PCM when the engine red ENGINE indicator engine hours and odometer Warning Level coolant temperature is and sounds the audible reading at the time of above 109 C (228 F). alarm. occurrence. When the temperature drops below 109 C (228 F) the DTC will become inactive. 322 Engine Coolant DTC 322 is set by the The PCM illuminates the The PCM will log the Temperature Above PCM when the engine red ENGINE indicator engine hours and odometer Critical Level coolant temperature is and sounds the audible reading at the time of above 112.5 C (234.5 F). alarm. occurrence. When the temperature drops below 112.5 C (234.5 F) the DTC will become inactive. 323 Engine Coolant DTC 323 is set by the When the coolant has If coolant level is correct, Level Below PCM when coolant is low. returned to correct levels, an ECL signal shorted to Warning/Critical Level When the EWPS mode is DTC 323 will become ground can cause DTC 3-way protection and DTC inactive. The PCM will 323. 323 is active, the engine log the engine hours and will shutdown. odometer reading at the time of occurrence. After the shutdown, the engine can be restarted for thirty seconds.

324 Idle Shutdown The IST feature is internal DTC 324 is set by the DTC 324 does not indicate Timer Enabled Engine to the PCM. The PCM when the engine any system or circuit Shutdown subsystems that contribute has been shutdown due DTCs. Diagnostic checks to the IST strategy have to exceeding the are not required for DTC their own fault codes. The programmed idle time 324. fault code for the IST is not criteria. The IST feature a system diagnostic trouble must be enabled for DTC code. The IST fault code is 324 to be displayed. only set to indicate that the IST has been activated and the engine has shutdown. DTC 325 Power DTC 325 is set by the When the temperature For each Celsius degree of Reduced - Matched To PCM when the cooling drops below 107 C temperature the fuel will be Cooling System system temperature (225 C ) the DTC will reduced 6%. This reduces Performance exceeds 107 C (225 C). At become inactive and the the heat produced by the this temperature the PCM engine will return to engine and reduces the will reduce the fuel normal operation. burden on the cooling delivered to the engine. system. The vehicle speed will also be reduced and allow the operator to downshift and increase the efficiency of the cooling system. As the temperature is reduced the compensation level is reduced until the temperature drops below 107 C (225 F ) and normal operation is resumed. DTC 331 - Injection DTC 331 is set by the DTC 331 can be an Check oil level for Control Pressure Above PCM when the injection indicator of a problem in contamination, debris, and System Working Range control pressure is above the mechanical injection correct API classification. normal working range of 25 control pressure system, MPa (3675 psi). When wiring, or ICP sensor. DTC 331 is active, the Possible causes for DTC PCM will ignore feedback 331 include the following: from the ICP sensor and Debris in engine control the IPR valve from Incorrect grade of oil programmed default values. Defective, stuck or plugged inlet on the IPR valve IPR control wire shorted to ground ICP sensor or circuit causing signal to be biased high The amber ENGINE indicator will be illuminated when DTC 331 is active.

332 Injection Control DTC 332 is set by the DTC 332 can be caused If the PCM sets DTC 332, Pressure Above PCM, if the voltage signal by a defective sensor, a the PCM will ignore the Specification With Engine from the ICP sensor is biased circuit, or ICP signal and operate the Not Running higher than expected with momentary loss of the IPR with fixed values the key on engine off. CMP/CKP signal. based on engine operating When DTC 332 is active conditions. the amber ENGINE indicator is illuminated. 333 Injection Control DTC 333 is set by the Low oil level in If ICP system was Pressure Above/below PCM when the measured crankcase. serviced, vehicle should be Desired Level pressure does not match Contaminated engine oil. operated 20 miles to the pressure expected by Debris in engine oil. validate system the PCM. DTC 333 will be Aerated engine oil. performance. set if the measured value Trapped air in the ICP is less than or greater than system (particularly after 2.5 MPa (362 psi) of an injector or high desired injection control pressure pump pressure for a period replacement). greater than 7 seconds. Intermittent IPR valve When DTC 333 is active, wiring connection. the PCM will ignore Spread IPR harness feedback from the ICP terminals at valve, poorly sensor and control the IPR crimped terminals, or valve from programmed default values. pulled back pins. Defective or stuck injection pressure regulator. Leaks in ICP system. Problem with ICP sensor or sensor circuit, incorrect sensor, system biased high or low. Defective high pressure hydraulic pump. The amber ENGINE indicator will be illuminated when DTC 333 is active.

334 ICP Unable To DTC 334 indicates an Low oil level in DTC 344 can be set due to Reach Set Point (Poor injection control system crankcase. a plugged EBP sensor or a Performance) response time fault and Contaminated engine oil. restriction in the tube may be set during normal Debris in engine oil. leading to the sensor. To engine operation through Aerated engine oil. check for this condition, the continuous monitor Trapped air in the ICP remove the sensor and function or during the system (particularly after tube and inspect for carbon Engine Running Standard an injector or high deposits. DTC 334 compares pressure pump measured ICP to desired replacement) ICP and looks for a large Intermittent IPR valve pressure difference of 9 wiring connection. MPa (1300 psi) for a period Spread IPR harness of 3 seconds. When DTC terminals at valve, poorly 334 is active, the PCM crimped terminals, or ignores the ICP sensor and pulled-back pins. controls the IPR valve Defective or stuck operation from injection pressure programmed default values. regulator. Leaks in ICP system. Problem with ICP sensor or sensor circuit, incorrect sensor, system biased high or low. Defective high pressure hydraulic pump. 335 ICP Unable To DTC 335 is set after the Low oil level in Engine cranking time Build Pressure During PCM detects 8 to 10 crankcase varies with engine Cranking seconds of engine cranking No lube oil pressure or temperature. Verify ICP with less than 5 MPa (725 lube oil delivery (reservoir sensor and IPR wiring is psi) of ICP. Engine empty or not filling) connected. Check for oil cranking speed must be Trapped air in the ICP leaks. Verify if system has greater than 130 rpm system (particularly after been recently serviced (air before diagnostic trouble an injector or high entrapment). If ICP system code detection can begin. pressure pump was serviced, vehicle replacement) should be operated 20 Leaks in ICP system miles to validate system Defective or stuck performance. injection pressure regulator Loose high pressure hydraulic pump gear Defective high pressure hydraulic pump 341 Exhaust Back When the EBP signal DTC 341 can be set due DTC 341 is set by the Pressure Signal Out Of voltage is detected out of to an open or short to PCM when the EBP signal Range Low range low, the PCM will ground on the signal is less than 0.039 volts for cause the engine to ignore circuit, a defective sensor more than 0.5 seconds. the EBP signal. The EGR or an open VREF circuit valve will close and the or VREF short to ground. PCM will rely on the VGT pre-programmed values. When DTC 341 is active the amber ENGINE indicator is illuminated.

342 Exhaust Back When the EBP signal DTC 342 can be set due DTC 342 is set by the Pressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EBP signal Range High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts for cause the engine to ignore source on the EBP signal more than 0.5 seconds. the EBP signal. The EGR circuit, or a defective valve will close and the sensor. PCM will rely on the VGT pre-programmed values. When DTC 342 is active the amber ENGINE indicator is illuminated. 343 Excessive Exhaust DTC 343 is set by the EBP sensor bias high Make sure all sensor, Back Pressure (Gauge) PCM when the exhaust EBP signal ground open injector and actuator backpressure is greater Exhaust restriction electrical DTCs have been than 260 kpa (37.7 psi). (muffler or catalytic repaired. converter) VGT valve or vanes stuck closed VGT Control Circuit short to B 344 Exhaust Back DTC 344 is set by the EBP sensor bias high Make sure all sensor, Pressure Above PCM when the EBP is EBP sensor or tube line injector and actuator Specification When greater than 300 kpa (43.5 plugged electrical DTCs have been Engine Off psi) when engine is off or repaired. being cranked. 345 Faults Detected DTC 345 is set by the Oil pressure and quality Make sure all sensor, During VGT Portion Of PCM during the AMS test High intake restriction injector and actuator The AMS Test when the PCM measures Intake/CAC system leak electrical DTCs have been the EBP and does not see (pipes, loose clamps, repaired. the expected response in pressures. hoses) Exhaust system leak MAP sensor bias EBP sensor bias EGR stuck open VGT valve or vanes sticking EBP sensor or tube plugged Power cylinder integrity VGT control circuit 346 - Faults Detected DTC 346 is set by the EGR valve stuck or Make sure all sensor, During EGR Portion Of PCM during AMS test sticking injector and actuator AMS Test when the PCM measures EGR valve position electrical DTCs have been EBP and EGRP and does sensor bias repaired. not see the expected EBP sensor bias response in pressures versus position. EBP sensor or tube plugged EGR control circuit 351 - Change In Exhaust DTC 351 is set by the EBP tube or sensor Make sure all sensor, Back Pressure Did Not PCM when less than 14.5 plugged injector and actuator Occur When Expected kpa (2.1 psi) is detected EBP sensor bias electrical DTCs have been between key ON and 2500 EGR valve stuck open repaired. rpm. Exhaust system leak

353 - Variable Geometry DTC 353 is set when the Oil pressure and quality Make sure all sensor, Turbo Control Over Duty PCM overcompensates by High intake restriction injector and actuator Cycle increasing duty cycle to the Intake/CAC system leak electrical DTCs have been VGT to achieve desired (pipes, loose clamps, repaired. boost/backpressure hoses) Exhaust system leak BAP sensor bias low MAP sensor bias low EBP sensor bias low ICP sensor bias high Power cylinder integrity ICP system integrity Injector operation/part number EGR valve stuck open VGT valve or vanes sticking VGT control circuit open 354 Variable Geometry DTC 354 is set when the Oil pressure and quality. Make sure all sensor, Turbo Control Under PCM overcompensates by BAP sensor bias high. injector and actuator Duty Cycle decreasing duty cycle to MAP sensor bias high. electrical DTCs have been the VGT to achieve the EBP sensor bias high. repaired. desired boost/backpressure. Open exhaust (no muffler). ICP sensor bias low. ICP system integrity. Injector operation/part number Exhaust restriction (muffler or catalytic converter) 355 Variable Geometry DTC 355 is set when the High intake restriction Make sure all sensor, Turbo Overspeed PCM detects turbo over Intake/CAC system leak injector and actuator speed several times in a (pipes, loose clamps, electrical DTCs have been specific period of time hoses) repaired. (dependent on PCM Restricted CAC system calibration). Turbo speed is VGT valves or vanes estimated by engine speed, sticking boost pressure, and barometric pressure. Open exhaust (no muffler) BAP sensor bias MAP sensor bias high EBP sensor bias low

361 - VGT Control Input DTC 361 is set when the High intake restriction Make sure all sensor, (MAP/EBP) Above/Below PCM detects an in range Intake/CAC system leak injector and actuator Desired Level error in the MAP/EBP (pipes, loose clamps, electrical DTCs have been signal. hoses) repaired. BAP sensor bias MAP sensor bias EBP sensor bias Power cylinder integrity ICP system integrity. Injector operation/part number EGR valve stuck open VGT valve or vanes sticking VGT control circuit open Open exhaust (no muffler) Exhaust restriction or leak (muffler or catalytic converter) DTC 365 - EGR Valve DTC 365 is set when the EGR valve stuck or Make sure all sensor, Position Above/Below actual EGR valve position sticking injector and actuator Desired Level does not match desired EGR valve position electrical DTCs have been position. sensor bias repaired. EBP sensor or tube plugged EBP sensor bias EGR control circuit DTC 366 - EGR Valve DTC 366 is set when the EGR valve stuck Make sure all sensor, Duty Operating Out Of PCM has EGR valve sluggish injector and actuator Expected Range overcompensated by EGR valve position electrical DTCs have been increasing or decreasing sensor error repaired. EGR duty to achieve the desired EGRP. Exhaust leak BAP sensor bias EBP sensor bias MAP sensor bias EGR cooler restriction/leak DTC 367 - Improper DTC 367 is set when the EGR valve stuck open Make sure all sensor, Position Signal When PCM detects the EGR EGR valve position injector and actuator EGR Valve Is Expected valve position is out of sensor bias high electrical DTCs have been Closed desired range during initial repaired. key ON (signal voltage greater than 2.5 volts). 421 through 428 DTC 421-428 is set by the DTC 421-428 usually The last digit in the injector Cylinder #1 through PCM when the rising time indicates a harness or DTC corresponds to the Cylinder #8 High Side To is too long on open or coil is open. cylinder where a fault has Low Side Open close coil. been detected. 431 through 438 DTC 431-438 is set by the DTC 431-438 usually The last digit in the injector Cylinder #1 through PCM when the rising time indicates an internally DTC corresponds to the Cylinder #8 High Side to 20 amps is short, but shorted coil cylinder where a fault has Shorted To Low Side not zero on the open or been detected. close coil.

451 through 458 DTC 451-458 is set by the DTC 451-458 usually The last digit in the injector Cylinder #1 through PCM when the rising time indicates the harness or DTC corresponds to the Cylinder #8 High Side to 20 amps is zero on the coil is shorted to ground cylinder where a fault has Short To Ground Or open or close coil. been detected. VPWR 523 IDM VPWR The IDM internally monitors DTC 523 can be set due DTC 523 is set by the Voltage Low battery voltage. When the to poor connections PCM when the voltage IDM continuously receives between the IDM terminal from the ignition switch is less than 7 volts, a DTC X3-7 and the ignition less than 7 volts. will be set. switch. 525 IDM Fault DTC 525 is set by the IDM When DTC 525 is set, PCM when there is an install a new IDM. internal IDM failure. 533 IDM Relay Voltage DTC 533 is set by the DTC 533 can be set due DTC 533 can be set when High PCM when the voltage to a generator voltage jump starting the engine from the IDM power relay output of greater than 16 exceeds 16 volts. volts or an incorrect external battery connections exist. 534 IDM Relay Voltage DTC 534 is set by the DTC 534 can be set due IDM relay voltage is less Low a PCM when the voltage to a defective generator, than 7 volts. from the IDM power relay IDM power relay, is less than 7 volts. discharged batteries or increased resistance in the battery feed circuits 543 PCM/IDM DTC 543 is set by the DTC 543 can be set If IDM power is low, DTC Communications Fault PCM when the PCM is not when the CAN 2 lines 543 can be set. communicating with the between the PCM and IDM. IDM are shorted to ground, VREF, battery or the current is open. When DTC 543 is active the amber ENGINE indicator is illuminated. 551 IDM/CMPO Signal DTC 551 is set by the DTC 551 can be set DTC 551 can also be set Inactive PCM when no CMPO when the CMPO is open, when no CMPO/CKPO is signal is present while the or shorted to ground or present while the PCM CKPO is active. shorted to a voltage reports it is in the run source. If logic power is mode. low, DTC 551 can be set. 552 IDM Incorrect DTC 552 is set when the DTC 552 can be set due The PCM continuously CMPO Signal Signature CMPO transition occurs at to a camshaft incorrectly monitors the IDM. When the wrong CKPO tooth. timed to crankshaft or an the PCM fails to receive electrical noise creating a required continuous miscount on CMP location. communication from the IDM, the PCM will set a DTC

DTC 553 IDM CKPO DTC 553 is set by the DTC 553 can be set DTC 552 can also be set Signal Inactive PCM when no CKPO when CKPO is open, when no CMPO/CKPO is signal is present while the shorted to ground, or present while the PCM CMPO is active. shorted to a voltage reports it is in the run source. DTC 553 can mode. also be set if logic power is low. 554 IDM Incorrect DTC 554 is set by the DTC 554 can be set due The PCM continuously CKPO Signal Signature PCM when CKPO signal to an electrical noise or a monitors the IDM. When has too few or too many defective CKP sensor. the PCM fails to receive transitions per engine rotation. required continuous communication from the IDM, the PCM will set a DTC. 571 through 578 DTC 571 through 578 is Oil pressure and quality When DTCs are set for Cylinder #1 through set by the PCM when the Fuel pressure Cylinder Balance all Cylinder #8 Cylinder IDM is unable to adjust fuel Intake restriction Performance Diagnostics Balance Limit Exceeded quantity to compensate for EGR system should be performed. rough idle. Exhaust system restriction 613 PCM/IDM Software PCM/IDM software is Replacement of PCM or Install correct PCM or IDM. Not Compatible incompatible IDM 614 EFRC/PCM Engine Family Rating Incorrect Engine Family Check EFRC and verify Configuration Mismatch Code (EFRC) does not Rating Code (EFRC) that it matches the PCM match PCM strategy level. selected for the PCM strategy level. Reprogram strategy programmed in the PCM or change the the module. EFRC as required. 621 Engine Using Mfg. Manufacturing defaults Programmable Program PCM. Default Rating selected. Very low power parameters for the PCM (25 hp). were never programmed in module. (Usually occurs in new vehicle or new module). 622 Engine Using Engine using Field Default Programmable Program PCM. Field Default Rating Rating. Low power (lowest parameters for the PCM rating in engine class) and incorrectly programmed vehicle features not in module. working. 623 Invalid Engine Invalid EFRC. Wrong EFRC selected for Check the EFRC and verify Family Rating Code the PCM strategy that it matches the PCM (EFRC) programmed in the strategy level. Reprogram module the PCM or change the EFRC as necessary. 624 Field Default Vehicle features not Programmable Program PCM. Active functioning (Low power - parameters for the PCM lowest rating in engine incorrectly programmed class). in module

626 Unexpected Reset DTC 626 is set when Loose or dirty The scan tool can be used Fault power is interrupted to the connections at battery or to display the ignition PCM. Turning the ignition ground cables can cause switch voltage measured OFF and then ON will the PCM to power down by the PCM. Monitor the cause the code to change DTC 626 will not turn the voltage at PCM pins X4-1 from active to inactive amber ENGINE indicator and X4-2. status. on Intermittent connections in the power feed wiring DTC 631 - Read Only Internal ROM fault. Internal PCM fault Install a new PCM. Memory (ROM) Self-Test Fault DTC 632 - Random Internal RAM fault. Internal PCM fault. Install a new PCM. Access Memory (RAM) - CPU Self-Test Fault 655 Programmable Programmable parameter Programming problem or Program PCM. Parameter List Level list level incompatible. internal PCM problem. Incompatible 661 RAM RAM programmable Internal PCM problem. Install a new PCM. Programmable Parameter parameter list corrupt. The List Corrupt DTC will cause a no start or the engine to run in field defaults. 664 Calibration Level Calibration level Programmable problem Program PCM. Incompatible. incompatible. The DTC will or internal PCM problem. cause a no start or the engine to run in field defaults. 665 Programmable Programmable parameter Internal PCM problem. Install a new PCM. Parameter Memory memory content corrupt. Content Corrupt The DTC will cause a no start or the engine to run in field defaults.