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Home >> Infiniti >> 2006 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ35DE) - Components And Specifications >> Fuel Injector >> Diagnostic Procedure
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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  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.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  3.

    Fig 1: Consult-II ACTIVE TEST Display Screen
    G04080452Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUNCTION OF FUEL INJECTOR-I 
    1. Turn ignition switch OFF.
    2. Disconnect harness connectors F221 (1), F33 (2).
      • <-: Vehicle front
      • Cylinder head (bank 2) (3)
    3. Turn ignition switch ON.
      Fig 2: Identifying Harness Connectors F221 (1) And F33 (2)
      G04138970Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F33 terminal 5 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
    7. Check harness continuity between the following terminals.
      FUNCTION OF FUEL INJECTOR-I

      Cylinder Harness connector F33 terminal ECM terminal
      1 6 23
      2 4 42
      3 2 22
      4 3 41
      5 1 21
      6 7 40
      Fig 3: Checking Voltage Between Harness Connector Terminal 5 And Ground
      G04073991Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist. 

    8. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M72, F102
    • Harness connectors F33, F221
    • Fuse block (J/B) connector M4
    • 15A fuse
    • Harness for open or short between harness connector F33 and fuse
    • Harness for open or short between harness connector F33 and ECM

    : Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK FUNCTION OF FUEL INJECTOR-II 

    Provide battery voltage between the following terminals, and then interrupt it. Listen to each fuel injector operating sound.

    FUNCTION OF FUEL INJECTOR-II

    Cylinder Harness connector F221 terminal
    (+) (-)
    1 5 6
    2 4
    3 2
    4 3
    5 1
    6 7

    Operating sound should exist. 

    Fig 4: Checking Function Of Fuel Injector-II
    G04138972Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  6.

  6. CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect fuel injector harness connector (1).
      Fig 5: Identifying Fuel Injector Harness Connector (1)
      G04138973Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between the following terminals. Refer to Wiring Diagram .
      SUB-HARNESS CIRCUIT FOR OPEN AND SHORT

      Harness connector F221 terminal Fuel injector terminal
      1 2
      2
      3
      4
      6
      7
      5 1

      Continuity should exist. 

    3. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK FUEL INJECTOR 

    Refer to , "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  8.

    NG: Replace fuel injector.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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