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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (5 Of 7) >> Engine (ECM) >> P1233 Electric Throttle Control Function >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P1233 or P2101 is displayed with DTC P1238 or P1290, first perform the confirmation procedure for DTC P1238 or P1290.

    Is applicable DTC detected?

    YES>>

    Perform diagnosis of applicable.

    NO>>

    GO TO 2.

  2. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Disconnect 15 A fuse (No. 63) from IPDM E/R.
    3. Check 15 A fuse for blown.

    Is the fuse blown (open)?

    YES>>

    Replace the fuse. [Check the power supply if fuse is blown (open) again.]

    NO>>

    GO TO 3.

  3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL 

    Check the voltage between ECM harness connector terminals as per the following.

    ECM Condition Voltage (V)
    + -
    Connector Terminal Connector Terminal
    F142 95 E152 204 Ignition switch OFF Approx. 0
    ON Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 4.

  4. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between IPDM E/R harness connector and ECM harness connector.
      + - Continuity
      IPDM E/R ECM
      Connector Terminal Connector Terminal
      E124 65 F142 139 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Repair or replace error-detected parts.

  5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT 
    1. Check the continuity between IPDM E/R harness connector and ECM harness connector.
      + - Continuity
      IPDM E/R ECM
      Connector Terminal Connector Terminal
      E123 57 F142 95 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for power supply circuit.

    NO>>

    Repair or replace error-detected parts.

  6. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect electric throttle control actuator harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.
      Electric throttle control actuator ECM Continuity
      Connector Terminal Connector Terminal
      F119 1 F142 149 Existed
      150 Not existed
      2 149 Not existed
      150 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

    Repair or replace error-detected parts.

  7. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 
    1. Remove the intake air duct. Refer to AIR CLEANER AND AIR DUCT : Exploded View .
    2. Check if foreign matter is caught between the throttle valve and the housing.
      GNSDB106309Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    1. Remove the foreign matter and clean the electric throttle control actuator inside.
    2. Perform throttle valve closed position leaning. Refer to Work Procedure .
  8. CHECK THROTTLE CONTROL MOTOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace malfunction electric throttle control actuator. Refer to INTAKE MANIFOLD COLLECTOR : Exploded View .

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