Final Control Module Or Ignition Coil Check
- If ignition coil is suspected of being defective, substitute a known good coil. Attempt to start vehicle. If it starts, reinstall old coil and start vehicle.
- If it then fails to start, replace with new coil. If control module is suspected, substitute a known good module. Start vehicle. If it starts, reinstall original module. If vehicle fails to start now, install new control module.
- If system still fails to operate, disconnect tachometer connector at instrument cluster. Attempt to start engine. If engine now starts, replace tachometer.