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Home >> Nissan-Datsun >> 2005 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> 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 engine ground. Refer to WIRING DIAGRAM - KS .
      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  4.
    • NG: GO TO  2.
  2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
    1. Disconnect knock sensor harness connector.
      Fig 1: Locating Knock Sensor Harness Connector
      G02410090Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between ECM terminal 15 and knock sensor terminal 1. Refer to WIRING DIAGRAM - KS .

      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 
    1. Turn ignition switch OFF.
    2. Loosen and retighten four ground screws on the body.

      Refer to GROUND INSPECTION .

      Fig 2: Checking Body Ground Connections
      G02410091Courtesy 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 - KS .

      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 F58, M70
    • Harness for open or short between knock sensor and ground
    • Repair open circuit or short power in harness or connectors.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    • INSPECTION END 
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