Ignition Coil Test (Accord 3.0L)
NOTE:
Ensure immobilizer, ignition, fuel and emission systems are working properly before performing ignition coil test.
- Remove ignition coil cover. Loosen suspect ignition coil bolt. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 3 (Black/Yellow wire). See Fig 1. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in Black/Yellow wire between suspect ignition coil and fuse No. 11 (15-amp). Fuse is located in underdash fuse/relay box, behind left end of instrument panel.
- Turn ignition off. Check for continuity between ground and suspect ignition coil harness connector terminal No. 2 (Black wire). If continuity exists, go to next step. If continuity does not exist, check for open in Black wire between suspect ignition coil and body ground point. Ground point is located at left side of engine, on thermostat housing, under radiator fan switch. See WIRING DIAGRAMS article.
- Disconnect PCM connector "C" (31-pin connector). Check for continuity between body ground and PCM connector "C" (31-pin connector) terminals No. 3 (White/Blue wire), No. 4 (Yellow/Green wire), No. 12 (Black/Red wire), No. 13 (Brown wire), No. 14 (Blue/Red wire) and/or No. 23 (Brown/White wire). If continuity does not exist, go to next step. If continuity exists, check for short to ground in wire between suspect ignition coil and PCM connector "C" (31-pin connector).
- Reconnect PCM connector "C" (31-pin connector). Turn ignition switch to START position. Measure voltage between ground and suspect ignition coil harness connector terminal No. 1. See Fig 1. If about .5 volt exists, replace ignition coil. If about .5 volt does not exist, check for open in wire between suspect ignition coil terminal No. 1 and PCM connector "C" (31-pin connector).