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.
2001 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Radiator & Condenser Fan Common Circuit Test: S2000
- Check No. 57 (20-amp) and No. 58 (20-amp) fuses in main underhood fuse/relay box and No. 20 (7.5-amp) fuse in underdash fuse/relay box. If fuses are okay, go to next step. If any fuse is blown, check circuits for which fuse protects and replace fuse. See WIRING DIAGRAMS article.
- Remove condenser fan relay from main underhood fuse/relay box. Turn ignition on. Measure voltage between body ground and condenser fan relay fuse/relay box socket No. 3 (Black/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black/Yellow wire between underdash fuse/relay box, radiator fan relay and condenser fan relay. See WIRING DIAGRAMS article.
- Turn ignition off. Reinstall condenser fan relay. Ensure A/C switch is off. Turn ignition on. Backprobing, measure voltage of Green wire between body ground and PCM connector "A" (32-pin connector) terminal No. 20. See Figure. If battery voltage is present, check for loose wires and/or poor connections at PCM connectors. If wires and connections are okay, substitute a known-good PCM and retest. See SUBSTITUTING POWERTRAIN CONTROL MODULE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - S2000 article. If symptom/indication goes away, replace original PCM. If battery voltage is not available, repair open in Green wire between condenser fan relay, radiator fan relay and PCM connectors. See WIRING DIAGRAMS article
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.