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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2407 (Engine Control System - Component Testing (VK56DE)) >> Ignition Signal >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. 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 

    Yes (With CONSULT)>>GO TO 2.

    Yes (Without CONSULT)>>GO TO  3.

    No: GO TO  4.

  2. CHECK OVERALL FUNCTION

    With CONSULT 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
    2. Check that each circuit produces a momentary engine speed drop.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  10.

  3. CHECK OVERALL FUNCTION

    Without CONSULT 

    1. Let engine idle.
    2. Read the voltage signal between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ground with an oscilloscope.
    3. Check that the oscilloscope screen shows the signal wave as shown below.
    NOTE: The pulse cycle changes depending on RPM at idle.
    Fig 1: Ignition Coil ECM Pulse Pattern
    G08165258Courtesy of NISSAN NORTH AMERICA, INC.
    Fig 2: Checking Voltage Signal Between ECM Terminals 46, 60, 61, 62, 65, 79, 80, 81 And Ground Using Oscilloscope
    G08165259Courtesy of NISSAN NORTH AMERICA, INC.

    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 it ON.
    2. Check voltage between ECM terminals 119, 120 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 5.

    NG: Go to "DIAGNOSIS PROCEDURE ".

    Fig 3: Checking Voltage Between ECM Terminals 119, 120 And Ground Using Tester
    G08165260Courtesy of NISSAN NORTH AMERICA, INC.
  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 Brake Fluid Reservoir And Condenser
      G08165261Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check voltage between condenser-1 terminal 1 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 6.

    Fig 5: Checking Voltage Between Condenser-1 Terminal 1 And Ground Using Tester
    G08165262Courtesy of NISSAN NORTH AMERICA, INC.
  6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R 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 "DIAGNOSIS PROCEDURE ".

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • IPDM E/R harness connector E119
    • Harness for open or short between condenser-1 and IPDM E/R

    Repair open circuit or 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.
      Fig 6: Identifying Ignition Coils With Power Transistor (Bank 1 And 2)
      G08165263Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch ON.
    5. Check voltage between ignition coil terminal 3 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  12.

    NG: GO TO 11.

    Fig 7: Checking Voltage Between Ignition Coil Terminal 3 And Ground Using Tester
    G08165264Courtesy of NISSAN NORTH AMERICA, INC.
  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between ignition coil and harness connector F32

    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 

    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 46, 60, 61, 62, 65, 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 

    OK: GO TO 14.

    NG: Repair open circuit or 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 malfunctioning ignition coil with power transistor.

  15. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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