J - PIN VOLTAGE CHARTS
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1 J - PIN VOLTAGE CHARTS 1995 Volvo ENGINE PERFORMANCE Volvo - Pin Voltage Charts 850 * PLEASE READ THIS FIRST * NOTE: Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate. INTRODUCTION Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at Electronic Control Unit (ECU) determines whether it is receiving and transmitting proper input and output signals. Charts may also help determine if ECU wiring harness is shorted or open. TESTING To read values requires the use of a scan tester, DVOM, Breakout Box ( ) and Adapter ( ). DO NOT measure resistance/voltage at ECU. Manufacturer does not recommend checking values directly at ECU connectors, as damage to wiring harness or ECU harness connector could occur. Unless otherwise specified, values specified in table are with ignition on and engine at normal operating temperature. Values are measured between ground terminal A20 and specified ECU terminal. See ECU PIN VALUES - FUEL INJECTION table or ECU PIN VALUES TABLE - IGNITION. ECU PIN VALUES - FUEL INJECTION ECU PIN VALUES TABLE - FUEL INJECTION ECU Circuit Voltage Terminal (Condition) (1) A1 Throttle Position Sensor Signal 0.5 (Ignition On & Closed Throttle) Throttle Position Sensor Signal 4.2 (Ignition On & Wide Open Throttle) A2 Throttle Position Sensor Power Supply (Ignition On) 5 A3-A7 A8 Mass Airflow Sensor Power Ground (Ignition On) Zero A9 Injectors Control Signal (Ignition On) Zero Injectors Control Signal (Engine Idling) (2) A10 Power Supply From Battery (Ignition On) Battery
2 A11 A12 Mass Airflow Sensor Signal Ground (Ignition On) Zero A13 Mass Airflow Sensor Signal (Ignition On) 2.8 Mass Airflow Sensor Signal (Engine Idling) 3.6 A14 Sensor Ground (Ignition On) Zero A15 Engine Coolant Temperature Sensor (Ignition On) (3) A16 Idle Air Control Valve Opening Signal (Ignition On) (4) IAC Valve Opening Signal (Engine Idling) A17 Idle Air Control Valve Closing Signal (Ignition On) (5) IAC Valve Closing Signal (Engine Idling) (6) A18 A19 Power Supply From Main Relay (Ignition On) Battery A20 Signal Ground (Always) (7) A21 A22 Heated Oxygen Sensor Signal (Ignition On) 0.45 Heated Oxygen Sensor Signal (Engine Idling) (Fluct -uates) A23 Heated Oxygen Sensor Ground (Always) Zero A24 Main Relay Control Signal (Ignition On) 1 A25 A/C Compressor (Ignition On) Zero A/C Compressor (Engine Idling) (8) A26 A27 Air Injection Control Solenoid Signal Zero (Solenoid Activated) Air Injection Control Solenoid Signal Battery (Solenoid Deactivated) A28 Heated Oxygen Sensor Preheater (Ignition On) Battery Heated Oxygen Sensor Preheater (Engine Idling) 0.5 A29 System Ground (Always) Zero A30 Power Supply From Ignition Switch (Ignition On) Battery B1-B4 B5 Data Link Connector Test Lead (Ignition On) Battery B6
3 B7 Malfunction Indicator Light (MIL) Control Signal 0.5 (MIL On) Malfunction Indicator Light (MIL) Control Signal Battery (MIL Off) B8-B11 B12 Load Signal (Ignition On) Zero Load Signal (Engine Idling) (9) B13-B17 B18 Vehicle Speed Sensor Signal (Ignition On & Drive Wheel Turning) B19 B20 Throttle Position Sensor Signal 0.5 (Ignition On & Closed Throttle) Throttle Position Sensor Signal 4.2 (Ignition On & Wide Open Throttle) B21 Tachometer Signal (Ignition On) Zero Tachometer Signal (Engine Idling) 4-7 B22 Air Injection Pump Relay Signal (Relay On) Zero Air Injection Pump Relay Signal (Relay Off) Battery B23 Engine Coolant Temperature Signal (Ignition On) 6 B24 PNP Idle Compensation Signal 5 (Ignition On, In Park Or Neutral) PNP Idle Compensation Signal 0.1 (Ignition On, Except In Park Or Neutral) B25 B26 Idling Compensation Signal (Ignition On) 11 B27 Fuel Pump Relay Control Signal (Ignition On) 7.5 Fuel Pump Relay Control Signal (Engine Idling) 4.5 B28 B29 Fuel Consumption Signal 0.8 (Ignition On, Models With Trip Computer) Fuel Consumption Signal Zero (Ignition On, Models Without Trip Computer) (1) - Check pin value between ECU ground terminal A20 and specified ECU terminal. (2) - Specification is 0.3 volt. Injector "On" time is milliseconds. Voltage and "On" time increases with engine speed and load.
4 (3) - Specification is 1.8 volts with sensor temperature at 68 F (20 C) or 200 millivolts with sensor temperature at 212 F (100 C). Voltage decreases as temperature increases. (4) - Specification is 2.2 volts on models with chassis No or less, or 3.4 volts on models with chassis No or greater and all 5-door models. (5) - Specification is 12 volts on models with chassis No or less, or 10.5 volts on models with chassis No or greater. (6) - Specification is 7.5 volts on models with chassis No or less, or 4.5 volts on models with chassis No or greater. (7) - Measured with negative lead connected to negative battery terminal. (8) - Zero voltage with A/C off. Battery voltage with A/C on. (9) - Frequency is 34 Hz. Duty cycle is 99.8 percent. Frequency increases and duty cycle percentage decreases with engine speed. ECU PIN VALUES - IGNITION ECU PIN VALUES TABLE - IGNITION ECU Circuit Voltage Terminal (Condition) (1) A1 RPM Sensor Signal (Ignition On) Zero RPM Sensor Signal (Engine Idling) 1.2 AC Volts A2 RPM Sensor Ground (Ignition On) Zero A3 A4 Camshaft Position Sensor Signal (Ignition On) (2) 5 Or Zero A5 EGR Temperature Sensor Signal (Ignition On) (3) A6-A9 A10 Power Supply From Battery (Ignition On) Battery A11-A13 A14 Camshaft Position Sensor Power Supply (Ignition On) Battery A15 Camshaft Position Sensor Ground (Ignition On) Zero A16 EGR Temperature Sensor Ground (Ignition On) Zero A17 Low Speed Cooling Fan (Fan Off) Battery Low Speed Cooling Fan (Fan On) Zero A18-A19 A20 ECU Signal Ground (Ignition On) (4) Zero
5 A21 A22 Front Knock Sensor Signal (Ignition On) Zero A23 Front Knock Sensor Ground (Ignition On) Zero A24 Rear Knock Sensor Ground (Ignition On) Zero A25 Rear Knock Sensor Signal (Ignition On) Zero A26 High Speed Cooling Fan (Fan Off) Battery High Speed Cooling Fan (Fan On) Zero A27 EGR Controller Signal (Ignition On) Battery A28 Control Unit Cooling Fan Signal (Fan Off) Battery Control Unit Cooling Fan Signal (Fan On) 0.8 A29 System Ground (Always) Zero A30 Power Supply From Ignition Switch (Ignition On) Battery B1 B2 Torque Control Signal From TCM (Ignition On) 5 B3 Torque Control Signal From TCM (Ignition On) 5 B4 Torque Control Acknowledgment Signal (Ignition On) 5 B5 Data Link Connector Test Lead (Ignition On) Battery B6 B7 Malfunction Indicator Light (MIL) Control Signal Zero (MIL On) Malfunction Indicator Light (MIL) Control Signal Battery (MIL Off) B8 Variable Intake Manifold Solenoid Signal (5) (Solenoid Closed) Variable Intake Manifold Solenoid Signal (6) (Solenoid Open) B9-B11 B12 Load Signal (Ignition On) Zero Load Signal (Engine Idling) (7) B13 Power Stage Control Signal (Ignition On) 0.15 Power Stage Control Signal (Engine Idling) 0.6 B14-B17 B18 Vehicle Speed Sensor Signal (Ignition On & Drive Wheel Turning)
6 B19 B20 Throttle Position Sensor Signal 0.5 (Ignition On & Closed Throttle) Throttle Position Sensor Signal 4.2 (Ignition On & Wide Open Throttle) B21 Tachometer Signal (Ignition On) Zero Tachometer Signal (Engine Idling) 4-7 B22 B23 Engine Coolant Temperature Signal (Ignition On) 6 B24 B25 A/C Acknowledgment Signal (Engine Idling & A/C Off) Zero A/C Acknowledgment Signal (Engine Idling & A/C On) Battery B26 Idling Compensation Signal Battery (Engine Idling & Engine Cooling Fan Off) B26 Idling Compensation Signal 0.7 (Engine Idling & Engine Cooling Fan On) B27 A/C High Pressure Switch (Ignition On) Zero B28 A/C Control Signal (Ignition On) 7-12 A/C Control Signal (Engine Idling & A/C On) Zero A/C Control Signal (Engine Idling & A/C Off) Battery B29 Rev Counter Signal (Ignition On) 11 Rev Counter Signal (Engine Idling) 6.5 B30 (1) - Check pin value between ECU ground terminal A20 and specified ECU terminal. (2) - Specification is dependent on camshaft position. (3) volts with sensor temperature at 32 F (0 C) or 1.8 volts with sensor temperature at 176 F (80 C). Voltage decreases as temperature increases. (4) - Measured with negative lead connected to negative battery terminal. (5) - Specification is battery voltage on models with chassis No or less, or 0.5 volt on models with chassis No or greater and all 5-door models. (6) - Specification is 0.5 volt on models with chassis No or less, or battery voltage on models with chassis No or greater. (7) - Frequency is 34 Hz. Duty cycle is 99.8 percent. Frequency increases and duty cycle percentage decreases with engine speed.
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