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HOMESERVICE MANUALSINFINITI2008EX35 BASE, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROL SYSTEM - DTCS U1000 TO P0153P0122, P0123, P0227, P0228 TP SENSORDIAGNOSIS PROCEDURE
2008 Infiniti EX35 Base, AWD

Diagnosis Procedure

2008 Infiniti EX35 Base, AWDSECTION Diagnosis Procedure
  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
    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.
      VOLTAGE SPECIFICATIONS

      DTC Electric throttle control actuator Ground Voltage (V)
      Bank Connector Terminal
      P0122, P0123 1 F6 6 Ground Approx. 5
      P0227, P0228 2 F27 1

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  3. 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.
      CONTINUITY SPECIFICATIONS

      DTC Electric throttle control actuator ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0122, P0123 1 F6 3 F101 40 Existed
      P0227, P0228 2 F27 4 48
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  4. 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.
      CONTINUITY SPECIFICATIONS

      DTC Electric throttle control actuator ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0122, P0123 1 F6 5 F101 34 Existed
      P0227, P0228 2 F27 3 35
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK THROTTLE POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
    1. Replace malfunctioning electric throttle control actuator.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.