[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - CHECK AT THE ECU TERMINALS | PRINT PAGE / INDEX / PRIOR / NEXT

| CHECK AT THE ECU TERMINALS
| TERMINAL VOLTAGE CHECK CHART
| Connect a needle-nosed wire probe to a voltmeter probe. 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! If voltmeter shows any division from standard value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace. After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem.
Engine-A/T-ECU Connector Terminal Arrangement
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)
7 | Engine warning lamp | Ignition switch: "LOCK" (OFF) → "ON" | 1 V or less → System voltage (After several seconds have elapsed)
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) <Vehicles for Hong kong> | Engine: Idling after warming up | 9 - 11 V
Engine: 5,000 r/min | System voltage
15 | Throttle valve control servo relay | Ignition switch: "ON" | System voltage
Running at 3,500 r/min while engine is warming up after having been started. | 1 V or less
16 | Fuel pump relay | Ignition switch: ON | System voltage
Engine: Idle speed | 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) <Vehicles for Hong kong> | Engine: Idling after warming up | 1 V or less
Engine: Racing | System voltage
23 | Purge control solenoid valve | Ignition switch: "ON" | Decreases Voltage
Running at 3,500 r/min while engine is warming up after having been started. | 1 V or less
24 | Cylinder 1, 4 oxygen sensor heater (rear) <Vehicles for Hong kong> | Engine: Idling after warming up | 1 V or less
Engine: 5,000 r/min | System voltage
25 | Cylinder 1, 4 oxygen sensor heater (front) <Vehicles for Hong kong> | Engine: Idling after warming up | 9 - 11 V
Engine: Racing | System voltage
31 | Ignition coil - No. 1 | Engine r/min: 3,000 r/min | 0.3 - 3.0 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
38 | Accelerator pedal position switch | Ignition switch: "ON" | Release the accelerator pedal | 0 - 1 V
Depress the accelerator pedal | 4 V or more
45 | Alternator G terminal | Engine: Warm, idle (radiator fan: OFF) Headlamp: OFF → ON Stop lamp: OFF → ON Rear defogger switch: OFF → ON | Voltage increases
47 | Power steering fluid pressure switch | Engine: Idling after warming up | When steering wheel is Stationary | System voltage
When steering wheel is turned | 1 V or less
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
69 | A/C switch | Engine: Idle speed | Turn the A/C switch OFF | 0.5 V or less
Turn the A/C switch ON (A/C compressor is operating) | System voltage
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
78 | A/C load signal | Refer to GROUP 55 - Troubleshooting (Inspection at the Automatic compressor - ECU Terminal)
86 | Alternator FR terminal | Engine: Warm, idle (radiator fan: OFF) Headlamp: OFF → ON Stop lamp: OFF → ON Rear defogger switch: OFF → ON | Voltage decreases
87 | Tachometer signal | Engine: 3,000 r/min | 0.3 - 3.0 V
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
101 | Manifold absolute pressure sensor | Engine: idling | 0.8 - 2.4 V
Engine: idling Revving (momentary wide open throttle) | Rises from 0.8 - 2.4 V suddenly
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 | 0.335 - 0.935 V
Depress the accelerator pedal fully | 4.0 V or more
108 | Cylinder 2, 3 oxygen sensor (front) <Vehicles for Hong kong> | Engine: Running at 2,500 r/min after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.8 V (Changes repeatedly)
109 | Oxygen sensor (front) <Except for Hong kong> | Engine: Running at 2,500 r/min after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.8 V (Changes repeatedly)
109 | Cylinder 1, 4 oxygen sensor (front) <Vehicles for Hong kong> | Engine: Running at 2,500 r/min after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.8 V (Changes repeatedly)
113 | Throttle position sensor (sub) | Remove the intake air hose at the throttle body Disconnect the throttle position sensor, 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 | 4.6 V or more
114 | Accelerator pedal position sensor (main) | Ignition switch: "ON" | Release the accelerator pedal | 0.335 - 0.935 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 throttle position sensor, 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) <Vehicles for Hong kong> | Engine: Idling after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.6 V (Changes repeatedly)
117 | Oxygen sensor (rear) <Vehicles for Brazil and Chile> | Engine: Idling after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.6 V (Changes repeatedly)
117 | Cylinder 1, 4 oxygen sensor (rear) <Vehicles for Hong kong> | Engine: Idling after warmed up (Check using a digital type voltmeter) | 0 ⇔ 0.6 V (Changes repeatedly)
118 | A/C pressure sensor | Engine: Idling A/C switch: ON | When A/C is "MAX, COOL" condition (when the load by A/C is high) | 2.2 V or more
When A/C is "MAX, HOT" condition (when the load by A/C is low) | 1.8 V or less
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).
| CHECK CHART FOR RESISTANCE AND CONTINUITY BETWEEN TERMINALS Turn the ignition switch to "LOCK" (OFF) position. Disconnect the engine-A/T-ECU connector. Measure the resistance and check for continuity between the terminals of the engine-A/T-ECU harness-side connector while referring to the check chart. NOTE: When measuring resistance and checking continuity, a harness for checking contact pin pressure should be used instead of inserting a test probe. Checking need not be carried out in the order given in the chart. CAUTION If the terminals that should be checked are mistaken, or if connector terminals are not correctly shorted to earth, damage may be caused to the vehicle wiring, sensors, engine-A/T-ECU and/or ohmmeter. Be careful to prevent this! If the ohmmeter shows any deviation from the standard value, check the corresponding sensor, actuator and related electrical wiring, and the repair or replace. After repair or replacement, recheck with the ohmmeter to confirm that the repair or replacement has corrected the problem.
Engine-A/T-ECU Harness Side Connector Terminal Arrangement
Terminal No. | Inspection item | Normal condition (Check condition)
--- | --- | ---
1 - 34 | No. 1 injector | 10.5 - 13.5 Ω (At 20°C)
5 - 34 | No. 2 injector
14 - 34 | No. 3 injector
21 - 34 | No. 4 injector
3 - 34 | EGR valve (A) | 20 - 24 Ω (at 20°C)
12 - 34 | EGR valve (B)
19 - 34 | EGR valve (C)
26 - 34 | EGR valve (D)
10 - 34 | Oxygen sensor <Except for Brazil, Chile and Hong kong> | 11 - 18 Ω (at 20°C)
10 - 34 | Oxygen sensor (front) <Vehicles for Brazil and Chile> | 4.5 - 8.0 Ω (at 20°C)
18- 34 | Oxygen sensor (rear) <Vehicles for Brazil and Chile> | 11 - 18 Ω (at 20°C)
10 - 34 | Cylinder 2,3 oxygen sensor heater (front) <Vehicles for Hong kong> | 4.5 - 8.0 Ω (at 20°C)
25 - 34 | Cylinder 1,4 oxygen sensor heater (front) <Vehicles for Hong kong>
18 - 34 | Cylinder 2,3 oxygen sensor heater (rear) <Vehicles for Hong kong> | 11 - 18 Ω (at 20°C)
24 - 34 | Cylinder 1,4 oxygen sensor heater (rear) <Vehicles for Hong kong>
23 - 34 | Purge control solenoid valve | 30 - 34 Ω (At 20°C)
33 - Body earth | ECU earth | Continuity (2 Ω or less)
42 - Body earth
144 - Body earth
145 - Body earth
34 - 95 | Oil control valve | 6.9 - 7.9 Ω (at 20°C)
96 - 98 | Engine coolant temperature sensor | 14 - 17 kΩ (When coolant temperature is -20°C)
5.1 - 6.5 kΩ (When coolant temperature is 0°C)
2.1 - 2.7 kΩ (When coolant temperature is 20°C)
0.9 - 1.3 kΩ (When coolant temperature is 40°C)
0.48 - 0.68 kΩ (When coolant temperature is 60°C)
0.26 - 0.36 kΩ (When coolant temperature is 80°C)
96 - 99 | Intake air temperature sensor | 13 - 17 kΩ (When intake air temperature is -20°C)
5.3 - 6.7 kΩ (When intake air temperature is 0°C)
2.3 - 3.0 kΩ (When intake air temperature is 20°C)
1.0 - 1.5 kΩ (When intake air temperature is 40°C)
0.56 - 0.76 kΩ (When intake air temperature is 60°C)
0.30 - 0.42 kΩ (When intake air temperature is 80°C)
133 - 141 | Throttle actuator control motor | 0.3 - 80 Ω (at 20°C)

[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - CHECK AT THE ECU TERMINALS | PRINT PAGE / INDEX / PRIOR / NEXT

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