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Home >> Nissan-Datsun >> 2004 >> Frontier Desert Runner SE >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VG33E >> Ignition Signal >> Diagnostic Procedure

Diagnostic Procedure

  1. INSPECTION START 

    Turn ignition switch OFF, and restart engine.

    Is engine running? 

    Yes or No 

    1. Yes (With CONSULT-II): GO TO 2.
    2. Yes (Without CONSULT-II): GO TO  3.
    3. No: GO TO  4.
  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    2. Make sure that all circuits do not produce a momentary engine speed drop.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO  4.
      Fig 1: Reading "POWER BALANCE" In "ACTIVE TEST" Mode
      G00742362Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK OVERALL FUNCTION 

    Without CONSULT-II 

    1. Let engine idle.
    2. Read the voltage signal between ECM terminal 1 and engine ground with an oscilloscope.
      Fig 2: Checking Voltage Signal Between ECM Terminal 1 And Engine Ground
      G00742364Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Verify that the oscilloscope screen shows the signal wave as shown below.
      Fig 3: Identifying Signal Wave
      G00742363Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 4.
  4. CHECK IGNITION COIL POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ignition coil harness connector.
    3. Turn ignition switch ON.
      Fig 4: Locating Ignition Coil Harness Connector
      G00742365Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between terminal 7 and engine ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 5.
      Fig 5: Checking Voltage Between Terminal 7 And Engine Ground
      G00742366Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E43, M65
    • Harness connectors M59, F27
    • Harness for open or short between ignition coil and ignition switch.

      : Repair harness or connectors.

  6. CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect power transistor harness connector.
    3. Check harness continuity between power transistor terminal 2 and engine ground. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Repair open circuit or short to power in harness or connectors.
  7. CHECK INPUT SIGNAL CIRCUIT 
    1. Strip tape covering resistor.
    2. Disconnect resistor harness connector.
    3. Check harness continuity between ignition coil terminal 8 and resistor terminal 1, resistor terminal 2 and ECM terminal 2. Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK RESISTOR 

    Check resistance between resistor terminals 1 and 2.

    Resistance: Approximately 2.2Ω [at 25°C (77°F] 

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace resistor.
      Fig 6: Checking Resistance Between Resistor Terminals 1 And 2
      G00742367Courtesy of NISSAN MOTOR CO., U.S.A.
  9. CHECK POWER TRANSISTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 1 and power transistor terminal 1. 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 10.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  10. CHECK IGNITION COIL 
    1. Disconnect ignition coil harness connector.
    2. Check resistance as shown in the figure.
      Fig 7: Checking Resistance Between Ignition Coil Harness Connector Terminals 7 And 8, 7 And 9
      G00742369Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 8: Reference Data
      G00742368Courtesy of NISSAN MOTOR CO., U.S.A.

    For checking secondary coil, remove distributor cap and measure resistance between coil tower metal tip 9 and terminal 7.

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Replace distributor assembly.
      Fig 9: Checking Resistance Between Coil Tower Metal Tip 9 And Terminal 7
      G00742370Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK POWER TRANSISTOR 
    1. Disconnect camshaft position sensor & power transistor harness connector and ignition coil harness connector.
    2. Check power transistor resistance between terminals 2 and 8.
      Fig 10: Checking Power Transistor Resistance Between Terminals 2 And 8
      G00742372Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 11: Reference Data
      G00742371Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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