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Home >> Nissan-Datsun >> 2004 >> Altima SE, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System - 3.5L >> Ignition Signal >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK ENGINE 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 each circuit produces a momentary engine speed drop.

    OK or NG

    1. OK : INSPECTION END 
    2. NG : GO TO  10.
      Fig 1: CONSULT-II Diagnosis Function Display
      G02886011Courtesy 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 terminals 5, 6, 7, 15, 16, 17 and ground with an oscilloscope.
    3. Verify that the oscilloscope screen shows the signal wave as shown below.
      NOTE: The pulse cycle changes depending on RPM at idle.
      Fig 2: Identifying Signal Wave Screen
      G02886012Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Voltage Between Terminals 5, 6, 7, 15, 16, 17 And Ground
      G02886013Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : INSPECTION END 
    2. 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 110, 112 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG

    1. OK : GO TO 5.
    2. NG : Go to "POWER SUPPLY AND GROUND CIRCUIT ".
      Fig 4: Checking Voltage Between Terminals 110, 112 And Ground
      G02886014Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II 

    Check voltage between ECM terminal 31 and ground with CONSULT-II or tester.

    Voltage: Battery voltage 

    OK or NG

    1. OK : GO TO  8.
    2. NG : GO TO 6.
      Fig 5: Checking Voltage Between Terminal 31 And Ground
      G02886015Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check harness continuity between ECM terminal 31 and IPDM E/R terminal 17. Refer to Wiring Diagram .

      Continuity should exist. 

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

    OK or NG

    1. OK : Replace IPDM E/R.
    2. NG : GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E20, F32
    • Harness for open and short between ECM and IPDM E/R
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect condenser harness connector.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between ECM terminal 31 and condenser terminal +, condenser terminal - and ground. Refer to Wiring Diagram .

      Continuity should exist. 

    5. Also check harness for short to ground and short to power.
      Fig 6: Disconnecting Condenser Harness Connector
      G02886016Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : GO TO 9.
    2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK CONDENSER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    1. OK : GO TO 10.
    2. NG : Replace condenser.
  10. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect ignition coil harness connector.

      Bank 1 

      Fig 7: Disconnecting Ignition Coil Harness Connector (1 Of 2)
      G02886017Courtesy of NISSAN MOTOR CO., U.S.A.

      Bank 2 

      Fig 8: Disconnecting Ignition Coil Harness Connector (2 Of 2)
      G02886018Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch ON.
    5. Check voltage between ignition coil terminal 3 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG

    1. OK : GO TO  12.
    2. NG : GO TO 11.
      Fig 9: Identifying Checking Voltage Between Ignition Coil Terminal 3 And Ground
      G02886019Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F43, F201
    • Harness for open or short between ignition coil and ECM
    • Harness for open or short between ignition coil and harness connector F32
    1. : Repair or replace 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

    1. OK : GO TO  14.
    2. NG : GO TO 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F43, F201
    • Harness for open or short between ignition coil and ground
    1. : Repair open circuit or short to power in harness or connectors.
  14. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 5, 6, 7, 15, 16, 17 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

    1. OK : GO TO  16.
    2. NG : GO TO 15.
  15. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F43, F201
    • Harness for open or short between ignition coil and ECM
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  16. CHECK IGNITION COIL WITH POWER TRANSISTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    1. OK : GO TO 17.
    2. NG : Replace ignition coil with power transistor.
  17. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
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