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Home › Infiniti › 2004 › I35 › Repair and Diagnosis › Engine Performance › System › Engine Control System › DTC P0327 & DTC 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 71 and engine ground.
      NOTE: It is necessary to use an ohmmeter which can measure more than 10 Mohm.
      Fig 1: Checking Resistance Between ECM Terminal 71 And Engine Ground
      G00786770Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Also check harness for short to ground and short to power.

      OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 2.
  2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
    1. Disconnect knock sensor harness connector.
    2. Check harness continuity between ECM terminal 71 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 

    1. OK: GO TO  4 .
    2. NG: GO TO 3.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F8, F131
    • 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 

    Check resistance between knock sensor terminal 1 and ground.

    NOTE: It is necessary to use an ohmmeter which can measure more than 10 Mohm.
    Fig 2: Checking Knock Sensor
    G00786771Courtesy of NISSAN MOTOR CO., U.S.A.

    Resistance: 500 - 620 kohm [at 25° C (77° F)] 

    CAUTION: Do not use any knock sensors that have been dropped or physically damaged. Use only new ones.

    OK or NG 

    1. OK: GO TO  8 .
    2. NG: Replace knock sensor.
  5. RETIGHTEN GROUND SCREWS 

    Loose and retighten engine ground screws.

    Fig 3: Locating Engine Ground Screws
    G00786772Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK: GO TO 6.
  6. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect harness connectors F8, F131.
    2. Check harness continuity between harness connector F8 terminal 2 and engine ground.

      Continuity should exist. 

    3. 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 F8, F131
    • Joint connector-18
    • Harness for open or short between harness connector F8 and engine ground
    1. : Repair open circuit or short to power in harness or connectors.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END 
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