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Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 4) >> Engine (ECM) >> DTC P0340: CMP Sensor >> DTC Diagnosis Procedure

DTC 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 or Work Flow . For the details of the GR8-1200 NI, Refer to SPECIAL SERVICE TOOL : Preparation ).

  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 5.

    NO-1>>

    P0340: GO TO 3.

    NO-2>>

    P0345: GO TO 4.

  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 F91 28 Existed

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for power supply circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair open circuit.

  4. CHECK SENSOR POWER SUPPLY 2 CIRCUIT 

    Perform Refer to Diagnosis Procedure . Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for power supply circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair or replace error-detected parts.

  5. 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 F91 45 Existed
      P0345 2 F83 2 F92 63
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

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

  6. 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 F91 40 Existed
      P0345 2 F83 3 F92 66
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

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

  7. CHECK CAMSHAFT POSITION SENSOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    GO TO 8

    NO>>

    Replace malfunctioning camshaft position sensor. Refer to TIMING CHAIN : Exploded View .

  8. CHECK CAMSHAFT (INT) 

    Check the following.

    • Accumulation of debris to the signal plate of camshaft front end
      GNSDB145467Courtesy of NISSAN NORTH AMERICA, INC.
    • Chipping signal plate of camshaft front end

    Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Remove debris and clean the signal plate of camshaft front end or replace camshaft.

  9. CHECK INTERMITTENT INCIDENT 

    Refer to Inspection .

    >>

    INSPECTION END

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