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Home >> Nissan-Datsun >> 2010 >> Frontier XE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> Ignition Signal >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK ENGINE START

    Turn ignition switch OFF, and restart engine.

    Is engine running? 

    Yes or No 

    Yes (With CONSULT-III): GO TO 2.

    Yes (Without CONSULT-III): GO TO  3.

    No: GO TO  4.

  2. CHECK OVERALL FUNCTION

    With CONSULT-III 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.
    2. Make sure that each circuit produce a momentary engine speed drop.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  10.

  3. CHECK OVERALL FUNCTION

    Without CONSULT-III 

    1. Let engine idle.
    2. Read the voltage signal between ECM terminals 61, 62, 80, 81 and ground with an oscilloscope.
    3. Verify that the oscilloscope screen shows the signal wave as shown in illustration.
    NOTE: The pulse cycle changes depending on rpm at idle.
    Fig 1: Voltage Signals Graph
    G05700259Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Checking Voltage Between ECM Terminals 61, 62, 80, 81 And Ground
    G05700260Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  10.

  4. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
    2. Check voltage between ECM terminals 119, 120 and ground with CONSULT-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 5.

    NG: Go to POWER SUPPLY AND GROUND CIRCUIT .

    Fig 3: Checking Voltage Between ECM Terminals 119, 120 And Ground
    G04900811Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect condenser-1 harness connector.
    3. Turn ignition switch ON.
      Fig 4: Identifying Condenser-1, Ignition Coil And Intake Manifold Collector
      G04895210Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between condenser-1 terminal 1 and ground with CONSULT-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 6.

    Fig 5: Checking Voltage Between Condenser Terminal 1 And Ground
    G04875485Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector E119.
    3. Check harness continuity between IPDM E/R terminal 3 and condenser-1 terminal 1.

      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  15.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between condenser-1 and IPDM E/R

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

  8. CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check harness continuity between condenser-1 terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO 9.

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

  9. CHECK CONDENSER-1

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace condenser-1.

  10. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect ignition coil harness connector.
    4. Turn ignition switch ON.
      Fig 6: Identifying Ignition Coil
      G04894498Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between ignition coil terminal 3 and ground with CONSULT-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  12.

    NG: GO TO 11.

    Fig 7: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 And Ground
    G04875257Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connector E2, F32
    • Harness for open or short between ignition coil and IPDM E/R.

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

  12. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check harness continuity between ignition coil terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG 

    OK: GO TO 13.

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

  13. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 61, 62, 80, 81 and ignition coil terminal 1.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 14.

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

  14. CHECK IGNITION COIL WITH POWER TRANSISTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 15.

    NG: Replace ignition coil with power transistor.

  15. CHECK INTERMITTENT INCIDENT

Refer to "INTERMITTENT INCIDENT ".

INSPECTION END 

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