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Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Maxima. 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 (With CONSULT-II): GO TO  2.

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

    NO: GO TO  7.

  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that each circuit produces a momentary engine speed drop.
    Fig 1: CONSULT-II Display - Active Test
    G04900123Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  7.

  3. CHECK FUNCTION OF FUEL INJECTOR-I 

    Without CONSULT-II 

    1. Stop engine.
    2. Disconnect harness connector F44 (1), F101 (2).
      • ← : Vehicle front
      • Intake manifold collector (3)
    3. Turn ignition switch ON.
      Fig 2: Identifying Intake Manifold Collector And Harness Connector
      G04915458Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F44 terminal 5 and ground with CONSULT-II 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 3: Checking Harness Continuity Between Harness Connector F44 And ECM
      G04905407Courtesy of NISSAN MOTOR CO., U.S.A.
      FUEL INJECTOR SPECIFICATION

      Cylinder Harness connector F44 terminal ECM terminal
      1 6 23
      3 2 22
      5 1 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 M70, F58
    • Fuse block (J/B) connector M4
    • 10A fuse
    • Harness for open or short between harness connector F44 and fuse
    • Harness for open or short between harness connector F44 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 harness connector F101 as follows and then interrupt it. Listen to each fuel injector operating sound.

    FUEL INJECTOR SPECIFICATION

    Cylinder Harness connector F101 terminal
    (+) (-)
    1 5 6
    3 5 2
    5 5 1
    Fig 4: Checking Function Of Fuel Injector-II
    G04905408Courtesy of NISSAN MOTOR CO., U.S.A.

    Operating sound should exist  .

    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  .

      4. Fig 5: Checking Function Of Fuel Injector-III
      G04900354Courtesy of NISSAN MOTOR CO., U.S.A.

    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 6: Identifying Fuel Injector Harness Connector
      G04905853Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      5. Fig 7: Checking Voltage Between Fuel Injector Terminal 1 And Ground
      G04900780Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  9.

    NG: GO TO  8.

  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M70, F58
    • Harness connectors F44, F101
    • Fuse block (J/B) connector M4
    • 10A fuse
    • 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 F101, 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.

  12. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

    >> INSPECTION END 

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