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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1168 (Engine Control System - DTCS P0451 To P1217) >> P0850 PNP Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC WITH TCM

    Refer to "DTC INDEX ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace malfunctioning part.

  2. CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-I
    1. Turn ignition switch OFF.
    2. Disconnect TCM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between TCM harness connector and IPDM E/R harness connector.
      CONTINUITY CHART

      TCM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F15 20 F10 72 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-II
    1. Disconnect IPDM E/R harness connectors.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      CONTINUITY CHART

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E10 102 E18 30 Existed
    4. 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.

    • Junction block harness connectors E45, E50
    • Harness for open or short between ECM and IPDM E/R

    : Repair or replace harness or connectors.

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair or replace malfunctioning part.