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Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Xterra. 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 (With CONSULT-III): GO TO 2.

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

    No: GO TO  7.

  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  7.

  3. CHECK FUNCTION OF FUEL INJECTOR-I

    Without CONSULT-III 

    1. Stop engine.
    2. Disconnect harness connector F44 (3), F201 (1)
      Fig 1: Identifying Harness Connector F44, F201 And Vacuum Tank
      G07152818Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between harness connector F44 terminal 3 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 harness connector F44 and ECM as follows.

      Refer to WIRING DIAGRAM .

      Fig 2: Checking Voltage Between Harness Connector F44 Terminal 3 And Ground
      G07152819Courtesy of NISSAN NORTH AMERICA, INC.
      TERMINAL VOLTAGE REFERENCE CHART

      Cylinder Harness connector F44 terminal ECM terminal
      1 2 23
      3 1 22
      5 4 21

      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 E2, F32
    • IPDM E/R harness connector E119
    • 15 A fuse (No. 55)
    • Harness for open or short between harness connector F44 and fuse
    • Harness for open or short between harness connector F201 and fuel injector

      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 harness connector F201 as follows and then interrupt it. Listen to each fuel injector operating sound.

    TERMINAL VOLTAGE REFERENCE CHART

    Cylinder Harness connector F201 terminal
    (+) (-)
    1 3 2
    3 3 1
    5 3 4

    Operating sound should exist. 

    Fig 3: Applying Battery Voltage Between Harness Connector F201
    G07152820Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 6.

    NG: GO TO  7.

  6. CHECK FUNCTION OF FUEL INJECTOR-III
    1. Reconnect all harness connector disconnected.
    2. Start engine.
    3. Listen to fuel injectors No. 2, No. 4, No. 6 operating sound.

      Clicking noise should exist. 

      Fig 4: Checking Fuel Injector Operating Sound
      G07152821Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: INSPECTION END 

      NG: GO TO 7.

  7. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector.
      Fig 5: Identifying Fuel Injector Harness Connector
      G07152822Courtesy of NISSAN NORTH AMERICA, INC.
    3. Turn ignition switch ON.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 6: Checking Voltage Between Fuel Injector Terminal 1 And Ground
      G07152823Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  9.

      NG: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • Harness connectors F44, F201
    • IPDM E/R harness connector E119
    • 15 A fuse (No. 55)
    • Harness for open or short between fuel injector and fuse

      Repair harness or connectors.

  9. 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.

      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  11.

      NG: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors F201, F44
    • Harness for open or short between fuel injector and ECM

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

  11. CHECK FUEL INJECTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 12.

    NG: Replace fuel injector. Refer to "EXPLODED VIEW ".

  12. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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