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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0850 Through P2A03 >> DTC P0850: PNP Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. INSPECTION START

    Check which type of transmission the vehicle is equipped with.

    Which type of transmission? 

    A/T >> GO TO 2.

    M/T >> GO TO  7.

  2. CHECK DTC WITH TCM

    Refer to "DIAGNOSIS DESCRIPTION ".

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair or replace.

  3. CHECK STARTING SYSTEM

    Turn ignition switch OFF, then turn it to START.

    Does starter motor operate? 

    YES: GO TO 4.

    NO: Check DTC with BCM. Refer to "COMMON ITEM : CONSULT-III FUNCTION (BCM - COMMON ITEM) ".

  4. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect A/T assembly harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between A/T assembly harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      A/T assembly ECM Continuity
      Connector Terminal Connector Terminal
      F51 9 M107 109 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F1, E3
    • Harness connectors E106, M6
    • Harness for open or short between A/T assembly and ECM

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

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

  7. CHECK PNP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect park/neutral position (PNP) switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between PNP switch harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      PNP switch Ground Voltage
      Connector Terminal
      F55 2 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • 10A fuse (No. 43)
    • IPDM E/R harness connector E7
    • Harness for open or short between PNP switch and fuse

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

  9. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PNP switch harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      PNP switch ECM Continuity
      Connector Terminal Connector Terminal
      F55 1 M107 109 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F103, M116
    • Harness for open or short between PNP switch and ECM

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

  11. CHECK PNP SWITCH

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace PNP switch.

  12. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair or replace.

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