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Home >> Nissan-Datsun >> 2004 >> Pathfinder LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Injector >> Diagnostic Procedure
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Diagnostic Procedure

  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.
      Fig 1: Checking Overall Function Of Injector With CONSULT II
      G00781334Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Make sure that each circuit produces a momentary engine speed drop.

    Without CONSULT-II 

    1. Start engine.
    2. Listen to each injector operating sound.
      Fig 2: Checking Overall Function Of Injector Without CONSULT II
      G00781335Courtesy 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.
      Fig 3: Identifying Injector Harness Connector
      G00781336Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch "ON".
    4. Check voltage between injector terminal 1 and ground with CONSULT-II or tester.
      Fig 4: Checking Voltage Between Injector Terminal 1 And Ground
      G00781337Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Check the following.

    • Harness connectors M33, F22
    • Harness connectors F5, F100
    • Fuse block (J/B) connector M10
    • 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 23, 22, 21, 42, 41, 40. Refer to WIRING DIAGRAM  .

      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 F100, F5
    • 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 
    1. Disconnect injector harness connector.
    2. Check resistance between terminals as shown in the figure.
      Fig 5: Checking Resistance Between Injector Terminals
      G00781338Courtesy of NISSAN MOTOR CO., U.S.A.

    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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