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Home >> Infiniti >> 2011 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0460 Through P1220 >> DTC P0850: PNP Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DTC WITH TCM

    Refer to "CONSULT-III 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.
      CONTINUITY SPECIFICATION

      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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