Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition Control Module Input Test (3.5RL)
2004 Acura 3.5RLSECTION Ignition Control Module Input Test (3.5RL)
- 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 (Red/Green wire), and No. 8 (White/Blue wire). See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS.
- If battery voltage exists at all indicated terminals, replace ICM. If battery voltage does not exist at all terminals, check for a blown No. 25 IG-COIL (30-amp) fuse located in underdash fuse/relay box.
- 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.