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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> Fuel Injector >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 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 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
    3. Make sure 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  .

      Fig 1: Checking Fuel Injector Operating Sound
      G08690812Courtesy of NISSAN NORTH AMERICA, INC.

      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 Connectors
      G08690813Courtesy 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
      G08690814Courtesy of NISSAN NORTH AMERICA, INC.
  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. Refer to FUEL INJECTOR AND FUEL TUBE .

  7. CHECK INTERMITTENT INCIDENT 

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

    :INSPECTION END 

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