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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P1424 >> DTC P0850: PNP Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DTC WITH TCM

    Refer to "CONSULT FUNCTION (TRANSMISSION) ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace malfunctioning part.

  2. CHECK STARTING SYSTEM

    Turn ignition switch OFF, then turn it to START.

    Does starter motor operate? 

    YES: GO TO 3.

    NO: Check DTC with BCM. Refer to "DTC INDEX ".

  3. CHECK PNP 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.
      A/T assembly ECM Continuity
      Connector Terminal Connector terminal
      F301 9 F111 11 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between A/T assembly and ECM
    • Loose or poor connection for each connector and harness

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

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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