CHECK AT THE ECU TERMINALS

1.Connect a needle-nosed wire probe to a voltmeter probe. 2.Insert the needle-nosed wire probe into each of the engine-A/T-ECU connector terminals from the wire side, and measure the voltage while referring to the check chart. note Make the voltage measurement with the engine-A/T-ECU connector connected. You may find it convenient to pull out the engine-A/T-ECU to make it easier to reach the connector terminals. The checks can be carried out off the order given in the chart. caution Short-circuiting the positive (+) probe between a connector terminal and earth could damage the vehicle wiring, the sensor, engine-A/T-ECU or all of them. Be careful to prevent this! 3.If voltmeter shows any division from standard value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace. 4.After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem. Terminal No. Check item Check condition (Engine condition) Normal condition 1 No. 1 injector While engine is idling after having warmed up, suddenly depress the accelerator pedal. From 9 - 13 V*, momentarily drops slightly 5 No. 2 injector 14 No. 3 injector 21 No. 4 injector 3 EGR valve (A) Ignition switch: Immediately after turning ON 5 - 8 V* (fluctuates for approximately 3 seconds) 12 EGR valve (B) 19 EGR valve (C) 26 EGR valve (D) 8 A/C relay Engine: Idle speed A/C switch: OFF → ON (A/C compressor is operating) System voltage → 1 V or less 10 Cylinder 2, 3 oxygen sensor heater (front) Engine: Idling after warming up 2 - 5 V* Engine: 4,000 r/min or more 0 V 15 Throttle valve control servo relay Ignition switch: ON → LOCK (OFF) 1 V or less → system voltage → 1 V or less 16 Fuel pump relay Ignition switch: ON System voltage Engine: Idling 1 V or less 17 Fan controller Radiator and condenser fan is not operating 0 - 0.3 V* Radiator and condenser fan is operating 0.7 V* or more 18 Cylinder 2, 3 oxygen sensor heater (rear) Engine: Idling after warming up System voltage Engine: 4,000 r/min or more 0 V 23 Purge control solenoid valve Ignition switch: ON System voltage Running at 3,500 r/min while engine is warming up after having been started. Decreases voltage 24 Cylinder 1, 4 oxygen sensor heater (rear) Engine: Idling after warming up System voltage Engine: 4,000 r/min or more 0 V 25 Cylinder 1, 4 oxygen sensor heater (front) Engine: Idling after warming up 2 - 5 V* Engine: 4,000 r/min or more 0 V 31 Ignition coil - No. 1 Engine: 3,000 r/min 0.1 - 2.0 V* 32 Ignition coil - No. 2 35 Ignition coil - No. 3 52 Ignition coil - No. 4 34 Power supply Ignition switch: ON System voltage 43 45 Alternator G terminal Engine: Idling after warming up (radiator fan: OFF) Headlamp: OFF → ON Stop lamp: OFF → ON Rear defogger switch: OFF → ON Voltage increases 50 Ignition switch - IG Ignition switch: ON System voltage 51 Ignition switch - ST Engine: Cranking 8 V or more 57 Engine control relay (Power supply) Ignition switch: LOCK (OFF) System voltage Ignition switch: ON 1 V or less 58 Backup power supply Ignition switch: LOCK (OFF) System voltage 63 Air flow sensor Engine: Gradually increase the speed. Voltage increase in response to revving 70 Crank angle sensor Engine: Cranking 0.4 - 4.0 V Engine: Idling 2.0 - 3.0 V 71 Camshaft position sensor Engine: Cranking 2.0 - 4.8 V Engine: Idling 3.0 - 4.0 V 84 Power steering fluid pressure sensor Engine: Idling after warning up When steering wheel is Stationary 0.4 - 1.0 V When steering wheel is turned Voltage rises Full lock 3.0 - 4.0 V 86 Alternator FR terminal Engine: Idling after warming up (radiator fan: OFF) Headlamp: OFF → ON Stop lamp: OFF → ON Rear defogger switch: OFF → ON Voltage decreases 92 Power supply voltage applied to accelerator pedal position sensor Ignition switch: ON 4.9 - 5.1 V 95 Oil control valve Ignition switch: ON System voltage Engine: warming up, 4,000 r/min 4.0 - 10 V* 97 Sensor impressed voltage Ignition switch: ON 4.9 - 5.1 V 98 Engine coolant temperature sensor Ignition switch: ON When engine coolant temperature is -20°C 3.9 - 4.5 V When engine coolant temperature is 0°C 3.2 - 3.8 V When engine coolant temperature is 20°C 2.3 - 2.9 V When engine coolant temperature is 40°C 1.3 - 1.9 V When engine coolant temperature is 60°C 0.7 - 1.3 V When engine coolant temperature is 80°C 0.3 - 0.9 V 99 Intake air temperature sensor Ignition switch: ON When intake air temperature is -20°C 3.8 - 4.4 V When intake air temperature is 0°C 3.2 - 3.8 V When intake air temperature is 20°C 2.3 - 2.9 V When intake air temperature is 40°C 1.5 - 2.1 V When intake air temperature is 60°C 0.8 - 1.4 V When intake air temperature is 80°C 0.4 - 1.0 V 106 Power supply voltage applied to throttle position sensor Ignition switch: ON 4.9 - 5.1 V 107 Accelerator pedal position sensor (sub) Ignition switch: ON Release the accelerator pedal 0.4 - 1.0 V Depress the accelerator pedal fully 3.6 V or more 108 Cylinder 2,3 oxygen sensor (front) Engine: 2,500 r/min after warmed up (Check using a digital type voltmeter) 0.4 V or less <=> 0.6 - 1.0 V (Changes repeatedly) 109 Cylinder 1,4 oxygen sensor (front) Engine: 2,500 r/min after warmed up (Check using a digital type voltmeter) 0.4 V or less <=> 0.6 - 1.0 V (Changes repeatedly) 113 Throttle position sensor (sub) Remove the intake air hose at the throttle body Disconnect the electronic-controlled throttle valve connector, and then connect terminal numbers No. 3, No. 4, No. 5 and No. 6 with the use of the special tool (MB991658). Ignition switch: ON Fully close the throttle valve with your finger 2.2 - 2.8 V Fully open the throttle valve with your finger 4.0 V or more 114 Accelerator pedal position sensor (main) Ignition switch: ON Release the accelerator pedal 0.8 - 1.2 V Depress the accelerator pedal fully 4.0 V or more 115 Throttle position sensor (main) Remove the intake air hose at the throttle body Disconnect the electronic-controlled throttle valve connector, and then connect terminal numbers No. 3, No. 4, No. 5 and No. 6 with the use of the special tool (MB991658). Ignition switch: ON Fully close the throttle valve with your finger 0.3 - 0.7 V Fully open the throttle valve with your finger 4.0 V or more 116 Cylinder 2,3 oxygen sensor (rear) Engine: Idling after warmed up (Check using a digital type voltmeter) 0.4 V or less <=> 0.6 - 1.0 V (Changes repeatedly) 117 Cylinder 1,4 oxygen sensor (rear) Engine: Idling after warmed up (Check using a digital type voltmeter) 0.4 V or less <=> 0.6 - 1.0 V (Changes repeatedly) 132 Power supply voltage applied to throttle valve control servo Ignition switch: ON System voltage 133 Throttle valve control servo (+) Ignition switch: ON Accelerator pedal: fully opened → fully closed Decreases slightly (approximately 2 V) from battery voltage. 141 Throttle valve control servo (-) Ignition switch: ON Accelerator pedal: fully closed → fully opened Decreases slightly (approximately 2 V) from battery voltage. note *:The average voltage is shown when an analog voltmeter is used (because the average voltage might not be shown stably when digital voltmeter is used).

Engine-A/T-ECU Connector Terminal Arrangement

Engine-A/T-ECU Harness Side Connector Terminal Arrangement