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Home >> Infiniti >> 2008 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VQ35DE) - Component And System Testing >> 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-III): GO TO 2.

    Yes (Without CONSULT-III): GO TO  3.

    No: GO TO  6.

  2. CHECK OVERALL FUNCTION 

    With CONSULT-III 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.
    3. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 3.

  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 1: Identifying Fuel Injector Harness Connectors (F221 And F33) And Cylinder Head
      G05209740Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F33 terminal 5 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    5. Turn ignition switch OFF.
    6. Disconnect ECM harness connector.
    7. Check harness continuity between the following terminals.
      ECM TERMINALS REFERENCE CHART

      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

      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.

    Fig 2: Checking Voltage Between Harness Connector F33 Terminal 5 And Ground
    G04905407Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M72, F102
    • Harness connectors F33
    • 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.

    CYLINDER AND CONNECTOR TERMINALS DESCRIPTION

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

    Operating sound should exist  .

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 6.

    Fig 3: Applying Battery Voltage Into Fuel Injector Terminals
    G05216517Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect fuel injector harness connector (1).
      Fig 4: Identifying Fuel Injector Harness Connector
      G05210200Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
      FUEL INJECTOR TERMINAL REFERENCE CHART

      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 malfunctioning fuel injector.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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