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Inspection Procedure 33

Ignition Circuit:




Connectors: B-27, C-51, C-58 <M/T>, C-52, C-55 <A/T>:




CIRCUIT OPERATION
- The battery positive voltage is applied on the ignition coil by the ignition switch-IG.
- When the ECM or PCM turns the power transistor in the ECM or PCM OFF," battery positive voltage is applied on the ignition power transistor (terminals 3), and the ignition power transistor turns on."
- When the ignition power transistor turns on, the ignition coil's primary circuit is grounded by the ignition power transistor terminal 4. Then the primary current flows to the ignition coil.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the ignition coil.
- Malfunction of the ignition power transistor.
- Improper connector contact, open circuit or short-circuited harness wire.
- Malfunction of the ECM.
- Malfunction of the PCM.

DIAGNOSIS




STEP 1. Check the ignition coil.
1. Measurement of the primary coil resistance.
2. Measure the resistance between connector terminals 1 and 2 of the distributor.

Standard value: 0.56 - 0.68 ohms




3. Measurement of the secondary coil resistance.
4. Measure the resistance between the high-voltage terminal and connector terminal 1.

Standard value: 9.4 - 12.8 kohms

If correct, go to Step 2.

If incorrect, replace the distributor.
Then confirm that the malfunction symptom is eliminated










STEP 2. Check the ignition power transistor.

NOTE: An analog-type ohmmeter should be used.

NOTE: Connect the negative (-) probe of the ohmmeter to terminal 2.

CAUTION: This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking.

If correct, go to Step 3.

If incorrect, replace the distributor.
Then confirm that the malfunction symptom is eliminated.




STEP 3. Check the power supply line at distributor connector B-22.
1. Disconnect connector B-22 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 1 and ground.
- Voltage should be battery positive voltage.

4. Turn the ignition switch to "LOCK" (OFF) position.

If within the specification, go to Step 4.

If not within specification, repair the harness wire and connector between the distributor and ignition switch.
Refer to Harness Connector Inspection.
Then confirm that the malfunction symptom is eliminated.




STEP 4. Check the ground line at distributor connectors B-22.
1. Disconnect connectors B-22 and measure at the harness side.
2. Check for continuity between terminal 4 and ground.
- Should be less than 2 ohms . If less than 2 ohms , go to Step 5.

If open circuit, repair the harness wire between distributor connectors B-22 and ground.
Then confirm that the malfunction symptom is eliminated.




STEP 5. Check harness connector B-22 at the distributor for damage.
If harness connector B-22 is in good condition, go to Step 6.

If harness connector B-22 is damaged, repair or replace it.
Refer to Harness Connector Inspection.
Then confirm that the malfunction symptom is eliminated.




STEP 6. Check the circuits at distributor connector B-22.
1. Disconnect connectors B-22 and measure at the harness side.
2. Crank the engine.
3. Measure voltage between terminal 3 and ground.
- Voltage should be between 2 and 7 volts.

4. Turn the ignition switch to "LOCK" (OFF) position. If within the specification, go to Step 9.

If not within specification, go to Step 7.




STEP 7. Check harness connector C-51 at the ECM or harness connector C-52 at the PCM for damage.
If harness connector C-51 or C-52 is in good condition, go to Step 8.

If harness connector C-51 or C-52 is damaged, repair or replace it.
Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.







STEP 8. Check the harness wire between distributor connectors B-22 (terminal 3) and ECM connector C-51 (terminal 11) or PCM connector C-52 (terminal 11) .
If the wires between distributor connectors B-22 (terminal 3) and ECM connector C-51 (terminal 11) or PCM connector C-52 (terminal 11) are not damaged, replace the ECM or PCM.
If the wires between distributor connectors B-22 (terminal 3) and ECM connector C-51 (terminal 11) or PCM connector C-52 (terminal 11) are damaged, repair them.
Then confirm that the malfunction symptom is eliminated.




STEP 9. Check harness connector C-58 at the ECM or harness connector C-55 at the PCM for damage.
If harness connector C-58 or C-55 is in good condition, go to Step 10.

If harness connector C-58 or C-55 is damaged, repair or replace it.
Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.







STEP 10. Check the harness wire between distributor connector B-22 (terminal 2) and ECM connector C-58 (terminal 45) or PCM connector C-55 (terminal 43) .
If the wires between distributor connector B-22 (terminal 2) and ECM connector C-58 (terminal 45) or PCM connector C-55 (terminal 43) are not damaged, replace the ECM or PCM.

If the wires between distributor connector B-22 (terminal 2) and ECM connector C-58 (terminal 45) or PCM connector C-55 (terminal 43) are damaged, repair them.
Then confirm that the malfunction symptom is eliminated.
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