[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - CHECK AT THE ECU TERMINALSPRINT PAGE / INDEX / PRIOR / NEXT
CHECK AT THE ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
       
    1. Connect a needle-nosed wire probe to a voltmeter probe.
    1. 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.
      2. NOTE: 
      1. Make the voltage measurement with the engine-A/T-ECU connector connected.
      1. You may find it convenient to pull out the engine-A/T-ECU to make it easier to reach the connector terminals.
      1. 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!
    1. If voltmeter shows any division from standard value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace.
    1. 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
    1. Turn the ignition switch to "LOCK" (OFF) position.
    1. Disconnect the engine-A/T-ECU connector.
    1. 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.
      2. NOTE: 
      1. When measuring resistance and checking continuity, a harness for checking contact pin pressure should be used instead of inserting a test probe.
      1. 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!
    1. If the ohmmeter shows any deviation from the standard value, check the corresponding sensor, actuator and related electrical wiring, and the repair or replace.
    1. 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 TERMINALSPRINT PAGE / INDEX / PRIOR / NEXT
    ©2004 Mitsubishi Motors Corporation