Ignition Control Module Input Test
- Turn ignition off. Disconnect Ignition Control Module (ICM) 8-pin harness connector. Check for continuity between ground and ICM harness connector terminals No. 2 (Black wire) and No. 7 (Black wire). See Fig 1. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire between ICM and ground.
- Turn ignition on. Measure voltage between ground and ICM harness connector terminals No. 1 (White/Black wire), No. 3 (White/Green wire), No. 4 (White wire), No. 5 (White/Red wire), No. 6 (White/Yellow wire on 3.2TL; Red/Green wire on 3.5RL), and No. 8 (White/Blue wire).
- If battery voltage exists at all indicated terminals, replace ICM. On 3.2TL, if battery voltage does not exist at all terminals, check for a blown 30-amp fuse located in ignition coil fuse holder. On 3.5TL, if battery voltage does not exist at all terminals, check for a blown IG-COIL fuse No. 25 (30-amp) located in underdash panel fuse panel.
- On all models, if battery voltage does not exist at a specific terminal, check for open or shorted circuit between ignition coil and ICM harness connector. If circuit is okay, substitute suspect ignition coil with known-good coil.
Courtesy of AMERICAN HONDA MOTOR CO., INC.