Ignition System Circuit
- Check for poor connections at distributor connector. Repair as necessary. If connections are okay, go to next step.
- Test ignition coil. See IGNITION COIL under IGNITION CHECKS in appropriate BASIC DIAGNOSTIC PROCEDURES article. Replace as necessary. If ignition coil is okay, go to next step.
- Test ignition coil power transistor. See IGNITION COIL POWER TRANSISTOR in appropriate BASIC DIAGNOSTIC PROCEDURES article. Replace as necessary. If ignition coil power transistor is okay, go to next step.
- Disconnect distributor connector. Turn ignition on. Using DVOM, measure voltage between ground and distributor connector terminal No. 1 (Black/White wire). See Figure . If battery voltage is indicated, go to next step. If battery voltage is not indicated, repair battery supply circuit between junction block and distributor.
- Using DVOM, measure resistance between ground and distributor connector terminal No. 4 (Black wire). If resistance is 2 ohms or less, go to next step. If resistance is greater than 2 ohms, repair open in Black wire between distributor and ground.
- Turn ignition off. Check ECM connectors C-111 and C-118 (M/T) or PCM connectors C-112 and C-115 (A/T) for loose, damaged or corroded terminals. If faulty connections are found, repair connector. After repairs, recheck system operation. If connections are okay, go to next step.
- Check for open in Black/Blue wire between distributor connector terminal No. 3, and ECM connector C-111 terminal No. 11 or PCM connector C-112 terminal No. 11. See Figure or Figure . Repair as necessary. If circuit is okay, go to next step.
- Check for open in White wire between distributor connector terminal No. 2, and ECM connector C-118 terminal No. 45 or PCM connector C-115 terminal No. 43. Repair as necessary. If circuit is okay, go to next step.