LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1105 (Engine Control System) >> Ignition Signal >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  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: Displaying "ACTIVE TEST" Mode
    G00908188Courtesy 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 60, 61, 62, 79, 80, 81 and ground with an oscilloscope.
    3. Verify that the oscilloscope screen shows the signal wave as shown below.
      Fig 2: Pules Cycle Graph
      G00908189Courtesy of NISSAN MOTOR CO., U.S.A.
      NOTE: The pulse cycle changes depending on RPM at idle.
      Fig 3: Checking Voltage Signal Between ECM Terminals 60, 61, 62, 79, 80, 81 And Ground With An Oscilloscope
      G00908190Courtesy 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 119, 120 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 ECM Terminals 119, 120 And Ground
      G00908191Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect condenser harness connector.
    3. Turn ignition switch ON.
      Fig 5: Disconnecting Condenser Harness Connector
      G00908192Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  8.
    2. NG: GO TO  6.
      Fig 6: Checking Voltage Between Condenser Terminal 1 And Ground
      G00908193Courtesy 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.
    3. Check harness continuity between IPDM E/R terminal 35 and condenser terminal 1.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO  17.
    2. NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F3
    • Harness for open or short between IPDM E/R and condenser
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between condenser terminal 2 and engine ground.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair open circuit 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-IV 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect ignition coil harness connector.
      Fig 7: Identifying Ignition Coil
      G00908194Courtesy 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 8: Checking Voltage Between Ignition Coil Terminal 3 And Ground
      G00908195Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F32, F221
    • Harness for open or short between ignition coil and harness connector F3
      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 engine 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 F221, F32
    • Harness for open or short between ignition coil and engine 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 60, 61, 62, 79, 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 

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

    Check the following.

    • Harness connectors F32, F221
    • 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 ".

    OK or NG 

    1. OK: Replace IPDM E/R.
    2. NG: Repair open circuit or short to ground or short to power in harness connectors.
scientia non olet · About LEMON Manuals