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Home >> Infiniti >> 2010 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 356 (Engine Control System - Component Testing) >> Fuel Injector >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Armada. 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 

    Yes: GO TO  2.

    No: GO TO  3.

  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.

    Without CONSULT-III 

    1. Start engine.
    2. Listen to each fuel injector operating sound.

      Clicking noise should be heard. 

      Fig 1: Checking Fuel Injector Operating Sound
      G04900354Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: INSPECTION END 

      NG: GO TO  3.

  3. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector.
      Fig 2: Identifying Fuel Injector Harness Connector
      G04900395Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      OK or NG 

      OK: GO TO  5.

      NG: GO TO  4.

      Fig 3: Checking Voltage Between Fuel Injector Terminal 1 And Ground With Consult-III Or Tester
      G04900780Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R connector E119
    • 15 A (No. 55) fuse
    • Harness for open or short between fuel injector and fuse

      Repair harness or connectors.

  5. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42, 44, 63.

      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  6.

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

  6. CHECK INJECTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  7.

    NG: Replace malfunctioning fuel injector.

  7. CHECK INTERMITTENT INCIDENT

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    INSPECTION END 

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