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Home >> Infiniti >> 2008 >> EX35 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0451 To P1212 >> P0850 PNP Switch >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK DTC WITH TCM

    Refer to "DIAGNOSIS DESCRIPTION ".

    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 "COMMON ITEM : CONSULT-III FUNCTION (BCM - COMMON ITEM) ".

  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 SPECIFICATIONS

      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  5.

    NO: GO TO 4.

  4. 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.

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END