Ignition Timing: Testing and Inspection

IGNITION SIGNAL


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 produces 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 60, 61, 62, 79, 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.
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.

5.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.





2. Disconnect condenser-1 harness connector.
3. Turn ignition switch ON.





4. Check voltage between condenser-1 terminal + and ground with CONSULT-III or tester.

Voltage: Battery voltage

OK or NG
OK >> GO TO 8.
NG >> GO TO 6.

6.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E122.
3. Check harness continuity between IPDM E/R terminal 17 and condenser-1 terminal +. 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 Power Supply And Ground Circuit.
NG >> GO TO 7.

7.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E5, F14
- 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-1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between condenser-1 terminal - 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-V
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect ignition coil harness connector.





4. Turn ignition switch ON.





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.

11.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F43, F201
- Harness for open or short between ignition coil and harness connector F14
>> 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 14.
NG >> GO TO 13.

13.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F201, F43
- Harness for open or short between ignition coil and ground
>> 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
OK >> GO TO 16.
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
>> 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
OK >> GO TO 17.
NG >> Replace malfunctioning ignition coil with power transistor.

17.CHECK INTERMITTENT INCIDENT
Refer to Description Diagnosis Procedure.
>> INSPECTION END