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Home › Nissan-Datsun › 2004 › Frontier Desert Runner SE › Repair and Diagnosis › Engine Performance › Engine Control System - VG33E › Injector Circuit › Diagnostic Procedure

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.
    3. Make sure that each circuit produces a momentary engine speed drop.
      Fig 1: Reading "POWER BALANCE" In "ACTIVE TEST" Mode
      G00742377Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

      Clicking noise should be heard. 

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 3.
    Fig 2: Checking Injector Operating Sound
    G00742378Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect injector harness connector.
    3. Check voltage between injector terminal 1 and engine ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
      Fig 3: Checking Voltage Between Injector Terminal 1 And Engine Ground
      G00742379Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M59, F27
    • Harness connectors F37, F101
    • Fuse block (J/B) connector M26
    • 10A fuse
    • Harness for open or short between injector and fuse

      : Repair harness or connectors.

  5. CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between injector terminal 2 and ECM terminals 102, 104, 106, 109, 111, 113. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. 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 F37, F101
    • Harness connectors F38, F102
    • Harness for open or short between ECM and injector

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

  7. CHECK INJECTOR 
    1. Disconnect injector harness connector.
    2. Check resistance between terminals as shown in the figure.

      Resistance: 10 - 14Ω [at 25°C (77°F)] 

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace injector.
      Fig 4: Checking Resistance Between Terminals
      G00742380Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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