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Home >> Nissan-Datsun >> 2005 >> Pathfinder LE, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> Injector Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No 

    • Yes (With CONSULT-II): GO TO 2.
    • Yes (Without CONSULT-II): GO TO  3.
    • No: GO TO  8.
  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
      Fig 1: CONSULT-II Display - Active Test Mode
      G02432491Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG 

    • OK: INSPECTION END 
    • NG: GO TO  8.
  3. CHECK FUNCTION OF INJECTOR-I 

    Without CONSULT-II 

    1. Stop engine.
    2. Disconnect harness connector F44, F101.
      Fig 2: Disconnecting Harness Connector F44 And F101
      G02432492Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between harness connector F44 terminal 3 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 
      Fig 3: Checking Voltage Between Harness Connector F44 Terminal 3 And Ground
      G02432493Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
    7. Check harness continuity between harness connector F44 and ECM as listed in ECM TERMINALS AND HARNESS CONNECTOR F44 TERMINALS REFERENCE .

      Refer to WIRING DIAGRAM .

      ECM TERMINALS AND HARNESS CONNECTOR F44 TERMINALS REFERENCE

      Cylinder Harness connector F44 terminal ECM terminal
      1 2 23
      3 1 22
      5 4 21
      • Continuity should exist. 
    8. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  6.
    • NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R harness connector E119
    • 15A fuse
    • Harness for open or short between harness connector F44 and fuse
    • Harness for open or short between harness connector F101 and injector
      • Repair open circuit or short to ground or short to power in harness or connectors.
    • CHECK FUNCTION OF INJECTOR-II 

      Provide battery voltage between harness connector F101 as shown in Fig 5 and then interrupt it. Listen to each injector operating sound.

      Fig 4: Cylinder No. And Harness Connector F101 Terminals Reference Chart
      G02432494Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Applying Battery Voltage Between Harness Connector F101
      G02432495Courtesy of NISSAN MOTOR CO., U.S.A.
      • Operating sound should exist. 

      OK or NG 

      • OK: GO TO 6.
      • NG: GO TO  8.
    • CHECK FUNCTION OF INJECTOR-III 
      1. Reconnect all harness connector disconnected.
      2. Start engine.
      3. Listen to injectors No. 2, No. 4, No. 6 operating sound.
        • Clicking noise should exist. 
        Fig 6: Listening For Fuel Injector Operating Sound
        G02432496Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      • OK: INSPECTION END 
      • NG: GO TO 7.
    • CHECK INJECTOR POWER SUPPLY CIRCUIT 
      1. Turn ignition switch OFF.
      2. Disconnect injector harness connector.
        Fig 7: Disconnecting Fuel Injector Harness Connector
        G02432497Courtesy 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.
        • Voltage: Battery voltage 
        Fig 8: Checking Voltage Between Fuel Injector Terminal 1 And Ground
        G02432498Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      • OK: GO TO  10.
      • NG: GO TO 8.
    • DETECT MALFUNCTIONING PART 

      Check the following.

      • Harness connectors E2, F32
      • Harness connectors F44, F101
      • IPDM E/R harness connector E119
      • 15A fuse
      • Harness for open or short between injector and fuse
        • Repair harness or connectors.
    • 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 .

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

      OK or NG 

      • OK: GO TO 12.
      • NG: GO TO 10.
    • DETECT MALFUNCTIONING PART 

      Check the following.

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

      Refer to COMPONENT INSPECTION .

      OK or NG 

      • OK: GO TO 12.
      • NG: Replace injector.
    • CHECK INTERMITTENT INCIDENT 

      Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

      • : INSPECTION END 
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