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Home >> Nissan-Datsun >> 2004 >> Quest SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0327, P0328: KS >> Diagnostic Procedure
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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 body ground. Refer to WIRING DIAGRAM  .
      NOTE: It is necessary to use an ohmmeter which can measure more than 10 Mohm.
      1. Resistance: Approximately 532 - 588 kohm [at 20°C (68°F)] 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  4 .
    2. NG: GO TO 2.
  2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
    1. Disconnect knock sensor harness connector.
      Fig 1: Disconnecting Knock Sensor Harness Connector
      G00775685Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between ECM terminal 15 and knock sensor terminal 1. Refer to WIRING DIAGRAM  .
      1. Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  4 .
    2. 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
      1. 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 

    1. OK: GO TO 5.
    2. NG: Replace knock sensor.
  5. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION  .
      Fig 2: Checking Ground Connections
      G00775686Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace ground connections.
  6. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect knock sensor harness connector.
    3. Check harness continuity between knock sensor terminal 2 and ground.

      Refer to WIRING DIAGRAM  .

      1. Continuity should exist. 
    4. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  8 .
    2. 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
      1. Repair open circuit or short power in harness or connectors.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. INSPECTION END 
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