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Home >> Nissan-Datsun >> 2005 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> 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 

    1. Yes : GO TO 2.
    2. No : GO TO  3.
  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
      Fig 1: ACTIVE TEST, POWER BALANCE - CONSULT-II Display Screen
      G02454311Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Make sure that each circuit produces a momentary engine speed drop.

    Without CONSULT-II 

    1. Start engine.
    2. Listen to each injector operating sound

      Clicking noise should be heard. 

      Fig 2: Listening To Injector Operating Sound
      G02454312Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : INSPECTION END 
    2. NG : GO TO 3.
  3. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
      Fig 3: Locating Fuel Injector Harness Connector
      G02454313Courtesy 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
      1. Voltage: Battery voltage 
      Fig 4: Checking Voltage Between Fuel Injector Connector Terminal 1 And Ground
      G02454314Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Check the following.

    • Harness connectors M19, E108
    • Harness connectors E10, F48
    • Harness connectors F12, F101
    • Fuse block (J/B) connector M1
    • 10A fuse
    • Harness for open or short between injector and fuse
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. 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 22, 23, 41, 42

      Refer to WIRING DIAGRAM .

      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK : GO TO  7.
    2. NG : GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F12, F101
    • 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.
  7. CHECK INJECTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK : GO TO 8.
    2. NG : Replace injector.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
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