Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 4) >> Engine (ECM) >> DTC P0123: TP Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT 
    1. Disconnect electric throttle control actuator harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between electric throttle control actuator harness connector and ground.
      Electric throttle control actuator Ground Voltage
      Connector Terminal
      F94 3 Ground Approx. 5 V

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair open circuit, short to ground or short to power in harness or connectors.

  2. CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.
      Electric throttle control actuator ECM Continuity
      Connector Terminal Connector Terminal
      F94 2 F92 85 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.
      Electric throttle control actuator ECM Continuity
      Connector Terminal Connector Terminal
      F94 4 F92 80 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair open circuit, short to ground or short to power in harness or connectors.

  4. CHECK THROTTLE POSITION SENSOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 5.

  5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 

    Replace electric throttle control actuator or INTAKE MANIFOLD : Removal and Installation .

    >>

    INSPECTION END

  6. CHECK INTERMITTENT INCIDENT 

    Refer to Inspection .

    >>

    INSPECTION END