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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 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.

    Is any cylinder ignited? 

    Yes or No 

    1. Yes (With CONSULT-II): GO TO 2.
    2. Yes (Without CONSULT-II): GO TO  3.
    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
      G03607424Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO  7.
  3. CHECK FUNCTION OF INJECTOR-I 

    Without CONSULT-II 

    1. Stop engine.
    2. Disconnect harness connector F44, F101.
    3. Turn ignition switch ON.
      Fig 2: Disconnecting Harness Connector F44, F101
      G03607425Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F44 terminal 3 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 Voltage Between Harness Connector F44 Terminal 3 And Ground
      G03607426Courtesy of NISSAN MOTOR CO., U.S.A.
      ON BOARD DIAGNOSTIC LOGIC

      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 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R harness connector E119
    • 15A fuse
    • Harness for open or short between harness connector F44 and fuse
    • Harness for open or short between harness connector F44 and ECM
    1. >> Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK FUNCTION OF INJECTOR-II 

    Provide battery voltage between harness connector F101 as follows and then interrupt it. Listen to each injector operating sound.

    ON BOARD DIAGNOSTIC LOGIC

    Cylinder Harness connector F101 terminal
    (+) (-)
    1 3 2
    3 3 1
    5 3 4

    Operating sound should exist  .

    OK or NG 

    1. OK: GO TO 6.
    2. NG: GO TO  7.
      Fig 4: Checking Battery Voltage Between Harness Connector F101
      G03607427Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK FUNCTION OF INJECTOR-III 
    1. Reconnect all harness connector disconnected.
    2. Start engine.
    3. Listen to injectors No. 2, No. 4, No. 6 operating sound.

      Clicking noise should exist  .

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 7.
      Fig 5: Checking Injectors Operating Sound
      G03607428Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
      Fig 6: Disconnecting Injector Harness Connector
      G03607429Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between injector terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  9.
    2. NG: GO TO 8.
      Fig 7: Checking Voltage Between Injector Terminal 1 And Ground
      G03607430Courtesy of NISSAN MOTOR CO., U.S.A.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • Harness connectors F44, F101
    • IPDM E/R harness connector E119
    • 15A fuse
    • Harness for open or short between injector and fuse
    1. >> Repair harness or connectors.
  9. CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between 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 

    1. OK: GO TO  11.
    2. NG: GO TO 10.
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F101, F44
    • Harness for open or short between injector and ECM
    1. >> Repair open circuit or short to ground or short to power in harness or connectors.
  11. CHECK INJECTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 12.
    2. NG: Replace injector.
  12. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. >> INSPECTION END 
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