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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1178 (Engine Control System - Component Testing (VK56DE)) >> Fuel Injector >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START

    Turn ignition switch to START.

    Are any cylinders ignited? 

    Yes or No 

    Yes: GO TO 2.

    No: GO TO  3.

  2. CHECK OVERALL FUNCTION

    With CONSULT 

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

    Without CONSULT 

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

    Clicking noise should be heard  .

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 3.

    Fig 1: Checking Fuel Injector Operating Sound
    G08165247Courtesy of NISSAN NORTH AMERICA, INC.
  3. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector.
      Fig 2: Identifying Injector Harness Connectors (Bank 1 And 2)
      G08165248Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT 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 Using Tester
    G08165249Courtesy of NISSAN NORTH AMERICA, INC.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R connector E119
    • 15 A fuse (No. 55)
    • 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 FUEL INJECTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 7.

    NG: Replace malfunctioning fuel injector. Refer to FUEL INJECTOR AND FUEL TUBE .

  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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