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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0463 >> DTC P0340, P0345: CMP Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK STARTING SYSTEM

    Turn ignition switch to START position.

    Does the engine turn over? Does the starter motor operate? 

    YES: GO TO 2.

    NO: Check starting system. (Refer to "WORK FLOW ".)

  2. CHECK CAMSHAFT POSITION SENSOR POWER SUPPLY CIRCUIT-I
    1. Disconnect camshaft position (CMP) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between CMP sensor harness connector and ground.
    DTC CMP sensor Ground Voltage (V)
    Bank Connector Terminal
    P0340 1 F84 1 Ground Approx. 5
    P0345 2 F83 1

    Is the inspection result normal? 

    YES: GO TO  8.

    NO-1: P0340: GO TO 3.

    NO-2: P0345: Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK CMP SENSOR POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between CMP sensor harness connector and ECM harness connector.
    CMP sensor ECM Continuity
    Bank Connector Terminal Connector Terminal
    1 F84 1 F110 77 Existed

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair open circuit.

  4. CHECK SENSOR POWER SUPPLY CIRCUIT

    Check harness for short to power and short to ground, between the following terminals.

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F110 76 CKP sensor F74 1
    77 Camshaft position sensor (bank 1) F84 1
    E80 131 APP sensor 2 (Without ICC) E110 1
    APP sensor 2 (With ICC) E67 9
    133 Battery current sensor E63 2
    Refrigerant pressure sensor E77 1
    EVAP control system pressure sensor C17 3

    Is the inspection result normal? 

    YES: GO TO 5.

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

  5. CHECK COMPONENTS

    Check the following.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace malfunctioning component.

  6. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  12.

    NO: GO TO 7.

  7. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly. Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (Without distance control assist system) or "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (With distance control assist system).

    : INSPECTION END

  8. CHECK CMP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between CMP sensor harness connector and ECM harness connector.
      DTC CMP sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0340 1 F84 2 F110 68 Existed
      P0345 2 F83 2 99
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK CMP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between CMP sensor harness connector and ECM harness connector.
      DTC CMP sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0340 1 F84 3 F110 95 Existed
      P0345 2 F83 3 73
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 10.

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

  10. CHECK CAMSHAFT POSITION SENSOR

    Refer to "COMPONENT INSPECTION (CAMSHAFT POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO 11

    NO: Replace malfunctioning camshaft position sensor. Refer to "EXPLODED VIEW ".

  11. CHECK CAMSHAFT (INT)

    Check the following.

    • Accumulation of debris to the signal plate of camshaft front end I
    • Chipping signal plate of camshaft front end
    Fig 1: Identifying Chipping Signal Plate Of Camshaft Front End
    G08260210Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Remove debris and clean the signal plate of camshaft front end or replace camshaft.

  12. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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