FAULT CODE VGT Actuator Driver Circuit - Abnormal Update Rate
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- Patience Florence Rice
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1 Page 1 of 22 FAULT CODE 2636 VGT Actuator Driver Circuit - Abnormal Update Rate View Related Topic Overview CODE REASON EFFECT Fault Code: 2636 PID: S027 SPN: 641 FMI: 9/9 LAMP: Red SRT: VGT Actuator Driver Circuit - Abnormal Update Rate. No communications on the J1939 data link between the engine ECM and the smart VGT controller. The VGT will move to the default open position. ISB, ISC, and ISL - VGT Actuator Circuit Circuit Description The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports failures back to the primary engine ECM, using the J1939 data link. Component Location The VGT actuator is located on the turbocharger bearing housing. Refer to Procedure in Section F. This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
2 Page 2 of 22 The primary engine ECM does not receive a valid J1939 message from the VGT actuator for more than 1 second. The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails. The VGT will move to the default open position. The ECM will turn off the red STOP ENGINE light and enable VGT operation immediately after a valid J1939 message is received from the VGT actuator. Shop Talk Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM again. Refer to Procedure in Section 19. This fault code is logged when the primary engine ECM does not receive valid J1939 information from the VGT actuator. Troubleshoot high inactive counts of Fault Code 2636 as an active fault code. Possible causes of this fault code include: The VGT actuator is not receiving power from the ECM. This could be caused by an open circuit in the power supply wire or low voltage supplied by the primary engine ECM An open return circuit on the VGT actuator circuit An open or short circuit on the J1939 data link circuit between the ECM and VGT actuator Intermittent communications between the VGT actuator and the primary engine ECM on the J1939 data link Rapid cycling of the keyswitch Connector pins are not installed in the appropriate locations specified by the wiring diagram. A damaged termination resistor in the engine data link harness A damaged engine ECM. The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter. Refer to Procedure in Section 14. This procedure is found in the ISB CM2150 Service Manual, Bulletin Refer to Procedure in Section 14 This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Cautions and Warnings CAUTION
3 Page 3 of 22 To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. Troubleshooting Steps CAUTION To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: Part Number male Deutsch /AMP /Metri-Pack test lead. STEPS SPECIFICATIONS STEP 1. Check the fault codes. STEP 1A. Check for inactive fault codes. Fault Code 2636 inactive? STEP 2. Check the VGT actuator circuit. STEP 2A. Inspect the VGT actuator and connector pins. STEP 2B. Check the J1939 data link resistor termination resistance inside the VGT actuator. STEP 2C. Check the voltage to the VGT actuator. Dirty or damaged pins? Resistance between 110 and 130 ohms? Voltage is within 1-VDC of battery voltage? STEP 3. Check the ECM and engine harness. STEP 3A. Inspect the ECM and engine harness connector pins. Dirty or damaged pins? STEP 3A-1. Check the VGT actuator voltage at the ECM. STEP 3A-2. Check the battery supply voltage to the ECM. STEP 3B. Inspect the ECM and engine harness connector pins. Dirty or damaged pins? STEP 3B-1. Check the J1939 data link termination resistor. STEP 3B-2. Check for an open in
4 Page 4 of 22 the J1939 data link harness. STEP 3B-3. Check for a short circuit in the J1939 data link harness. STEP 3B-4. Check for a short circuit to ground in the J1939 data link harness. STEP 3B-5. Check the fault codes. STEP 4. Clear the fault code. STEP 4A. Check for progressive damage to the aftertreatment system. STEP 4B. Disable the fault code. STEP 4C. Clear the inactive fault codes. Progressive damage to the aftertreatment system found during the Snap Acceleration Test? Fault Code 2636 inactive? All fault codes cleared? Guided Step 1 - Check the fault codes. Guided Step 1A - Check for inactive fault codes. Turn keyswitch ON. Connect INSITE electronic service tool. Check for inactive fault codes. Use INSITE electronic service tool to read the fault codes. Fault Code 2636 inactive? Fault Code 2636 inactive?
5 Page 5 of 22 Refer to Procedure in Section 19. Go to 2A Guided Step 2 - Check the VGT actuator circuit. Guided Step 2A - Inspect the VGT actuator and connector pins. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Inspect the engine harness and VGT actuator connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris on or in the connector pins Connector shell broken Wire insulation damage Damaged connector locking tab. Use the following procedure for general inspection techniques. Refer to Procedure in Section 19. Dirty or damaged pins? A damaged connection has been detected in the harness or VGT actuator connector. Dirty or damaged pins?
6 Page 6 of 22 Clean the connector and pins. Repair the damaged harness, connector, or pins, if possible. Refer to Procedure in Section 19. Replace the VGT actuator. Refer to Procedure in Section 10. This procedure is found in the ISB CM2100 and CM2150 Service Manual, Bulletin Refer to Procedure in Section 10. This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Go to 4A Go to 2B Guided Step 2B - Check the J1939 data link resistor termination resistance inside the VGT actuator. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Check the J1939 data link resistance. Measure the resistance between the SAE J1939 data link (+) wire and the SAE J1939 data link (-) wire at the VGT actuator connector. Use the following procedure for general resistance measurement techniques. Refer to Procedure in Section 19. Resistance between 110 and 130 ohms? Resistance between 110 and 130 ohms?
7 Page 7 of 22 The J1939 data link termination resistor is damaged in the VGT actuator. Replace the VGT actuator. Refer to Procedure in Section 10. This procedure is found in the ISB CM2100 and CM2150 Service Manual, Bulletin Refer to Procedure in Section 10. This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Go to 2C Go to 4A Guided Step 2C - Check the voltage to the VGT actuator. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Turn keyswitch ON. Check the power supply and return circuit to the VGT actuator. Measure the voltage between the VGT actuator power SUPPLY circuit and the VGT actuator RETURN circuit at the engine harness TE: Check the voltage at key-on and while cranking the engine. Refer to the circuit diagram or the wiring diagram for connector pin identification. Voltage is within 1-VDC of battery voltage? Voltage is within 1-VDC of battery voltage?
8 Page 8 of 22 Go to 3B Go to 3A Guided Step 3 - Check the ECM and engine harness. Guided Step 3A - Inspect the ECM and engine harness connector pins. Turn keyswitch OFF. Disconnect the engine harness from the ECM connector. Inspect the engine harness and ECM connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris on or in the connector pins Connector shell broken Wire insulation damage Damaged connector locking tab. Use the following procedure for general inspection techniques. Refer to Procedure in Section 19. Dirty or damaged pins? Repair the damaged pins. Repair or replace Dirty or damaged pins?
9 Page 9 of 22 the engine harness, OEM harness, or replace the ECM, whichever has the damaged pins. Flush the dirt, debris or moisture from the connector pins. Use electronic contact cleaner, Part Number Install the appropriate connector seal if it is damaged or missing Repair the engine harness. Refer to Procedure in Section 19. Replace the engine harness. Refer to Procedure in Section 19. Repair the OEM harness. Refer to Procedure in Section 19. Replace the OEM harness. Refer to the OEM service manual. Call for pre-authorization to replace the ECM. Upon receipt of authorization, replace the ECM. Refer to Procedure in Section 19. Go to 4A Go to 3A-1 Guided Step 3A-1 - Check the VGT actuator voltage at the ECM. Turn keyswitch OFF. Disconnect the engine harness from the ECM connector. Turn keyswitch ON. Check the power supply and return circuit to the VGT actuator.
10 Page 10 of 22 Measure the voltage to the VGT actuator power RETURN circuit at the ECM connector. Note: Check the voltage at key-on. Refer to the circuit diagram or the wiring diagram for connector pin identification. Refer to Procedure in Section 19. This procedure gives instructions for general measurement techniques. Voltage is within 1- VDC of battery voltage? An open circuit in the VGT actuator power SUPPLY or RETURN circuit has been detected in the engine harness. Voltage is within 1-VDC of battery voltage? Repair or replace the engine harness. Refer to Procedure in Section 19. Go to 4A Go to 3A-2 Guided Step 3A-2 - Check the battery supply voltage to the ECM.
11 Page 11 of 22 Turn keyswitch OFF. Disconnect the OEM power harness from the ECM connector. Turn keyswitch ON. Check the power supply and return circuit to the ECM. Measure the voltage between the ECM power SUPPLY circuit and the ECM RETURN circuit at the OEM power harness connector. Measure the voltage between the VGT actuator power SUPPLY circuit and the VGT actuator RETURN circuit at the engine harness connector. Refer to the circuit diagram or the wiring diagram for connector pin identification. Refer to Procedure in Section 19. This procedure
12 Page 12 of 22 gives instructions for general measurement techniques. Voltage is equal to battery voltage? Call for preauthorization to replace the ECM. Upon receipt of authorization, replace the ECM. Refer to Procedure in Section 19. Go to 4A Voltage is equal to battery voltage? Low voltage has been detected at the ECM power connector. Check the battery voltage and the OEM wiring between the battery and the ECM power harness connector. Go to 4A Guided Step 3B - Inspect the ECM and engine harness connector pins. Turn keyswitch OFF. Disconnect the engine harness from the ECM connector. Inspect the engine harness and ECM connector pins for the following: Loose connector Corroded pins Bent or broken pins Pushed back or expanded pins Moisture in or on the connector Missing or damaged connector seals Dirt or debris on or in the connector pins Connector shell broken Wire insulation damage
13 Page 13 of 22 Damaged connector locking tab. Use the following procedure for general inspection techniques. Refer to Procedure in Section 19. Dirty or damaged pins? Repair the damaged pins. Repair or replace the engine harness, OEM harness, or replace the ECM, whichever has the damaged pins. Dirty or damaged pins? Flush the dirt, debris or moisture from the connector pins. Use electronic contact cleaner, Part Number Install the appropriate connector seal if it is damaged or missing Repair the engine harness. Refer to Procedure in Section 19. Replace the engine harness. Refer to Procedure in Section 19. Repair the OEM harness. Refer to Procedure in Section 19. Replace the OEM harness. Refer to the OEM service manual. Call for authorization to replace the ECM. Upon receipt of authorization, refer to Procedure in Section 19. Go to 4A Go to 3B-1 Guided Step 3B-1 - Check the J1939 data link termination resistor. Turn keyswitch OFF. Disconnect the J1939 termination resistor from the engine harness.
14 Page 14 of 22 Check the J1939 data link termination resistor resistance. Measure the resistance between the SAE J1939 data link (+) and SAE J1939 data link (-) at the J1939 termination resistor. Use the following procedure for general resistance measurement techniques. Refer to Procedure in Section 19. Resistance between 110 and 130 ohms? Go to 3B-2 Resistance between 110 and 130 ohms? Replace the J1939 termination resistor. Go to 4A Guided Step 3B-2 - Check for an open in the J1939 data link harness. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Disconnect the engine harness from the ECM connector. Disconnect the terminating resistor from the engine harness. Disconnect the EGR valve from the engine harness. Check for an open circuit in the J1939 data link harness. Measure the resistance between the SAE J1939 data link (+) wire at the VGT actuator engine harness connector and the SAE J1939 data
15 Page 15 of 22 link (+) wire at the ECM engine harness connector. Measure the resistance between the SAE J1939 data link (-) wire at the VGT actuator engine harness connector and the SAE J1939 data link (-) wire at the ECM engine harness connector. Use the following procedure for general resistance measurement techniques. Refer to Procedure in Section 19. Less than 10 ohms? Less than 10 ohms? An open has been detected in the J1939 data link harness. Repair or replace the engine harness. Refer to Procedure in Section 19. Go to 3B-3 Go to 4A Guided Step 3B-3 - Check for a short circuit in the J1939 data link harness. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Disconnect the engine harness from the ECM connector. Disconnect the EGR valve from the engine
16 Page 16 of 22 harness. Remove the J1939 termination resistor from the engine harness. Check for a short circuit in the J1939 data link harness. Measure the resistance between the SAE J1939 data link (+) wire at the ECM engine harness connector and all other pins in the connector. Measure the resistance between the SAE J1939 data link (-) wire at the ECM engine harness connector and all other pins in the connector. Note: Disregard any resistance between 50 and 130 ohms between the SAE J1939 (+) and the SAE J1939 data link (-) pins. Use the following procedure for general resistance measurement
17 Page 17 of 22 techniques. Refer to Procedure in Section 19. Greater than 100k ohms? Greater than 100k ohms? A short circuit has been detected in the J1939 data link harness. Repair or replace the engine harness. Refer to Procedure in Section 19. Go to 3B-4 Go to 4A Guided Step 3B-4 - Check for a short circuit to ground in the J1939 data link harness. Turn keyswitch OFF. Disconnect the VGT actuator from the engine harness. Disconnect the engine harness from the ECM connector. Disconnect the EGR valve from the engine harness. Check for a short circuit to ground in the J1939 data link harness.
18 Page 18 of 22 Measure the resistance between the SAE J1939 data link (+) wire at the ECM engine harness connector and ground. Measure the resistance between the SAE J1939 data link (-) wire at the ECM engine harness connector and ground. Use the following procedure for general resistance measurement techniques. Refer to Procedure in Section 19. Greater than 100k ohms? Greater than 100k ohms? A short circuit has been detected in the J1939 data link harness. Repair or replace the engine harness. Refer to Procedure in Section 19. Go to 3B-5 Go to 4A Guided Step 3B-5 - Check the fault codes.
19 Page 19 of 22 Turn keyswitch OFF. Connect the engine harness to the ECM connector. Connect the VGT actuator to the engine harness. Connect the J1939 data link termination resistor. Connect the EGR valve to the engine harness. Turn keyswitch ON. Connect INSITE electronic service tool. Check for the appropriate circuit response after 30 seconds. Use INSITE electronic service tool to read the fault codes. Fault Code 2636 active? Replace the VGT actuator. Refer to Procedure in Section 10. This procedure is found in the ISB CM2100 and CM2150 Service Manual, Bulletin Refer to Procedure in Section 10. This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Go to 4A Fault Code 2636 active? None. The removal and installation of the connector corrected the fault. Go to 4A Guided Step 4 - Clear the fault code. Guided Step 4A - Check for progressive damage to the aftertreatment system.
20 Page 20 of 22 Perform the Snap Acceleration Test. Refer to Procedure in Section 14. This procedure is found in the ISB CM2150 Service Manual, Bulletin Refer to Procedure in Section 14. This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Check for damage to the aftertreatment system. Perform the Snap Acceleration Test to check for damage to the aftertreatment diesel particulate filter. Refer to Procedure in Section 14 This procedure is found in the ISB CM2150 Service Manual, Bulletin Refer to Procedure in Section 14 This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin Progressive damage to the aftertreatment system found during the Snap Acceleration Test? Replace the damaged aftertreatment component. Progressive damage to the aftertreatment system found during the Snap Acceleration Test? Refer to Procedure in Section 11. This procedure is found in the ISB CM2150 Service Manual, Bulletin Refer to Procedure in Section 11. This procedure is found in the ISC and ISL CM2150 Service Manual, Bulletin
21 Page 21 of 22 Go to 4B Go to 4B Guided Step 4B - Disable the fault code. Connect all components. Turn keyswitch ON. Connect INSITE electronic service tool. Disable the fault code. Use INSITE electronic service tool to verify that the fault code is inactive. Fault Code 2636 inactive? Go to 4C Fault Code 2636 inactive? Return to the troubleshooting steps or contact a Cummins Authorized Repair Location if all steps have been completed and checked again. Go to 1A Guided Step 4C - Clear the inactive fault codes. Connect all components. Turn keyswitch ON. Connect INSITE electronic service tool.
22 Page 22 of 22 Clear the inactive fault codes. Use INSITE electronic service tool to clear the inactive fault codes. All fault codes cleared? Repair complete All fault codes cleared? Troubleshoot any remaining active fault codes. Appropriate troubleshooting steps Last Modified: 27-May-2009 Copyright 2009 Cummins, Inc. All rights reserved
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