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.
1999 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Ignition Control Module (ICM) Input Test (CR-V)
- Turn ignition off. Remove distributor cap, rotor and leak cover. Disconnect wires from ICM. See Figure. Turn ignition on. Check for voltage between ground and Black/Yellow 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 switch and ICM. See WIRING DIAGRAMS article. Repair wire as necessary.
- Turn ignition on. Check for voltage between ground and White/Blue wire. If battery voltage exists, go to next step. If battery voltage does not exist, check ignition coil. See appropriate IGNITION COIL RESISTANCE TEST . Replace coil as necessary. If ignition coil is okay, check for an open in White/Blue wire between ICM and ignition coil. See WIRING DIAGRAMS article.
- Disconnect PCM 25-pin connector "B". Check for continuity in Yellow/Green wire between ICM and PCM 25-pin harness connector "B" terminal No. 13. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire.
- Check for continuity between ground and Yellow/Green wire. If continuity exists, repair short to ground in Yellow/Green wire. If continuity does not exist and wiring is okay, replace ICM.
Factory Service Tools
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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.
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