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Home >> Nissan-Datsun >> 2006 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0445 >> DTC P0327, P0328 KS >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check resistance between ECM terminal 15 and ground. Refer to WIRING DIAGRAM .
      NOTE: It is necessary to use an ohmmeter which can measure more than 10 MΩ.

      Resistance: Approximately 532 - 588 kΩ [at 20°C (68°F)] 

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

    OK or NG 

    OK : GO TO  5.

    NG : GO TO 2.

  2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
    1. Disconnect knock sensor harness connector.
      Fig 1: Identifying Knock Sensor Harness Connector
      G04196765Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between ECM terminal 15 and knock sensor terminal 1.

      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 F26, F301
    • Harness for open or short between ECM and knock sensor

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

  4. CHECK KNOCK SENSOR 

    Refer to , "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 5.

    NG : Replace knock sensor.

  5. CHECK GROUND CONNECTIONS 

    Loosen and retighten three ground screws on the body. Refer to , "GROUND INSPECTION ".

    Fig 2: Locating Body Ground Screws E24, E15, F9 And E133
    G04196499Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO 6.

    NG : Repair or replace ground connections.

  6. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect knock sensor harness connector.
    2. Check harness continuity between knock sensor terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG 

    OK : GO TO  8.

    NG : GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F26, F301
    • Harness connectors E5, F14
    • Harness for open or short between knock sensor and ground

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

  8. CHECK INTERMITTENT INCIDENT 

    Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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