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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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  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: Disconnecting Knock Sensor Harness Connector
      G02474001Courtesy 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 
    1. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Checking Ground Connections
      G02474002Courtesy 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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