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Home >> Nissan-Datsun >> 2005 >> Altima SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VQ35DE >> Injector Circuit >> Diagnostic Procedure
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Diagnostic Procedure

  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 Active Test Screen
    G02527413Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK:INSPECTION END 
    • 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
      G02527414Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F44 terminal 6 (with triple meters) or 5 (without triple meters) and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between Harness Connector F44 Terminal 6 (With Triple Meters) Or 5 (Without Triple Meters) And Ground
      G02527415Courtesy of NISSAN MOTOR CO., U.S.A.

      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 .
      CONNECTOR F44 AND ECM CONTINUITY WITH TRIPLE METERS

      Cylinder Harness connector F44 terminal ECM terminal
      1 1 23
      3 3 22
      5 7 21
      CONNECTOR F44 AND ECM CONTINUITY WITHOUT TRIPLE METERS

      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 M71, F59
    • 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 F101 and injector
      • : 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.

    Fig 4: Checking Injector-II Function
    G02527416Courtesy of NISSAN MOTOR CO., U.S.A.

    With triple meters 

    Fig 5: F101 Terminals Connection Chart (With Triple Meters)
    G02527417Courtesy of NISSAN MOTOR CO., U.S.A.

    Without triple meters 

    Fig 6: F101 Terminals Connection Chart (Without Triple Meters)
    G02527418Courtesy 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 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

    • OK:INSPECTION END 
    • NG: GO TO 7.
    Fig 7: Checking Injectors No. 2, No. 4, No. 6 Operating Sound
    G02527419Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
      Fig 8: Disconnecting Injector Harness Connector
      G02527420Courtesy 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

    • OK: GO TO  9.
    • NG: GO TO 8.
    Fig 9: Checking Voltage Between Injector Terminal 1 And Ground
    G02527421Courtesy of NISSAN MOTOR CO., U.S.A.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M71, F59
    • Harness connectors F44, F101
    • Fuse block (J/B) connector M4
    • 10A fuse
    • Harness for open or short between injector and fuse
      • : Repair open circuit or short to ground or short to power in 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

    • 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 injector and ECM
      • : 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

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

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    • : INSPECTION END 
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