Diagnostic Procedure

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.
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 8.
  
  Fig 1: Displaying ACTIVE TEST Mode
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK OVERALL FUNCTION
Without CONSULT-II
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 below.
  NOTE: The pulse cycle changes depending on RPM at idle.
  
  Fig 2: Checking Voltage Between ECM Terminals 61, 62, 80, 81 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Voltage Signal Wave Form
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : INSPECTION END
2. NG : GO TO 8.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn ignition switch 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 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
3. Check harness continuity between IPDM E/R terminal 17 and condenser terminal 1, condenser terminal 2 and ground. 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 7.
2. NG : GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connector E20, F32
- Harness for open or short between IPDM E/R and condenser
- Harness for open or short between condenser and ground
1. : Repair or replace open circuit or short to power in harness or connectors.
CHECK CONDENSER
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 8.
2. NG : Replace condenser.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect ignition coil harness connector.
4. Turn ignition switch ON.
  
  Fig 5: Identifying Ignition Coil
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 10.
2. NG : GO TO 9.
  
  Fig 6: Checking Voltage Between Ignition Coil Terminal 3 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connector E20, F32
- Harness for open or short between ignition coil and IPDM E/R
1. : Repair or replace harness or connectors.
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 11.
2. NG : Repair open circuit or short to power in harness or connectors.
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
1. OK : GO TO 12.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 13.
2. NG : Replace ignition coil with power transistor.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. >> INSPECTION END