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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No 

    1. Yes: GO TO 2.
    2. No: GO TO  3 .
  2. CHECK OVERALL FUNCTION 

    WITH CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that each circuit produces a momentary engine speed drop.
      Fig 1: Identifying ACTIVE TEST Screen
      G00776048Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine.
    2. Listen to each injector operating sound.
      Fig 2: Listening To Injector Operating Sound
      G00776049Courtesy of NISSAN MOTOR CO., U.S.A.

      Clicking noise should be heard. 

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 3.
  3. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
    3. Turn ignition switch ON.
      Fig 3: Disconnecting Injector Harness Connector
      G00776050Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between injector terminal 1 and ground with CONSULT-II or tester.
      Fig 4: Checking Voltage Between Injector Terminal 1 And Ground
      G00776051Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E8, F17
    • Harness connectors F44, F101
    • Fuse block (J/B) connector E30
    • 10A fuse
    • Harness for open or short between injector and fuse
      1. Repair harness or connectors.
  5. CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.

      Refer to WIRING DIAGRAM  .

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

    OK or NG 

    1. OK: GO TO  7 .
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F101, F44
    • Harness for open or short between injector and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK INJECTOR 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace injector.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. INSPECTION END 
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