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Home >> Nissan-Datsun >> 2007 >> X-Trail LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1148 To P2138 >> DTC P1574 ASCD Vehicle Speed Sensor >> Diagnostic Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Procedure

  1. CHECK DTC WITH TCM 

    Check DTC with TCM. Refer to "ON BOARD DIAGNOSTIC (OBD) SYSTEM ".

    OK or NG 

    OK: GO TO 2.

    NG: Perform trouble shooting relevant to DTC indicated.

  2. CHECK DTC WITH VDC/TCS/ABS CONTROL UNIT (WITH VDC MODELS) OR ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) (WITHOUT VDC MODELS) 

    Refer to "TROUBLE DIAGNOSIS " (without VDC models) or "TROUBLE DIAGNOSIS " (with VDC models).

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace.

  3. CHECK COMBINATION METER 

    Check combination meter function.

    Refer to "COMBINATION METERS ".

INSPECTION END 



  1. CHECK PNP SWITCH GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect park/neutral position (PNP) switch harness connector.
    3. Check harness continuity between PNP switch terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to power.

    OK or NG 

    OK: GO TO 2.

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

  2. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between PNP switch terminal 1 and ECM terminal 102.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M61, F41
    • Harness for open or short between PNP switch and ECM

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

  4. CHECK PNP SWITCH 

    Refer to "DTC P0705 PARK/NEUTRAL POSITION (PNP) SWITCH " (A/T) or "PARK/NEUTRAL POSITION SWITCH " (M/T).

    OK or NG 

    OK: GO TO  4.

    NG: Replace PNP switch.

  5. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END