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Home >> Nissan-Datsun >> 2008 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0444 Through P1168 >> DTC P0850 PNP Switch >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK STARTING SYSTEM 

    Turn ignition switch OFF, then turn it to START.

    Does starter motor operate? 

    Yes or No 

    Yes: GO TO 2.

    No: Refer to "STARTING SYSTEM ".

  2. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I 
    1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
    2. Check voltage between combination meter terminal 30 and ground with CONSULT-III or tester under the following conditions.
      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Condition (Shift position) Voltage
      P or N position BATTERY VOLTAGE (11 - 14V)
      Except above position Approximately 0 V

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 3.

    Fig 1: Checking Voltage Between Combination Meter Terminal 30 And Ground
    G04905682Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK PNP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect PNP switch harness connector (1).
      • <=: Vehicle front
    3. Turn ignition switch ON.
      Fig 2: Identifying PNP Switch Harness Connector
      G04905683Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between PNP switch terminal 1 and ground with CONSULT-III or tester.

      Refer to WIRING DIAGRAM .

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

    Fig 3: Checking Voltage Between PNP Switch Terminal 1 And Ground
    G04905684Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Fuse block (J/B) connector E30
    • 10A fuse
    • 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.

  5. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I 
    1. Check harness continuity between PNP switch terminal 5 and combination meter terminal 30. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F33, E19
    • Harness connectors E25, M90
    • Harness for open or short between PNP switch and combination meter

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

  7. CHECK PNP SWITCH 

    Refer to "DTC P0705 PARK/NEUTRAL POSITION SWITCH ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace PNP switch.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

  9. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 102 and combination meter terminal 7.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  11.

    NG: GO TO 10.

  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E134, M83
    • Harness for open or short between ECM and combination meter

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

  11. CHECK COMBINATION METER 

    Refer to "COMBINATION METERS ".

    OK or NG 

    OK: GO TO 12.

    NG: Replace combination meter

  12. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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