Ignition Control Module Input Test
- Turn ignition off. Disconnect ignition control module (ICM) 4-pin connector mounted on ignition coil. Check for continuity between terminal No. 4 (Black wire) and ground. See Fig 1. If continuity exists, go to next step. If continuity does not exist, check for an open Black wire, disconnected terminals or a poor G101 ground located near Idle Air Control (IAC) valve.
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- Turn ignition on. Check voltage between ICM 4-pin connector terminals No. 3 (Black/Yellow wire) and No. 4 (Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for an open in Black/Yellow wire between ignition coil and ICM, disconnected terminals or faulty ignition coil.
- With ignition on, check for battery voltage between ICM 4-pin connector terminals No. 2 (Green wire) and No. 4 (Black wire). If battery voltage does not exist, check for an open in Green wire between ignition coil and ICM. Repair as necessary. If Green wire is okay, substitute a known-good ignition coil and recheck.