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.
2000 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Electrical Power Steering (EPS) Circuit (S2000)
- Turn ignition on. Using backprobe set, measure voltage between PCM 32-pin connector "A" terminals No. 26 (Blue/Black wire) and 25-pin connector "B" terminal No. 20 (Brown/Yellow wire). See PIN VOLTAGE CHARTS article. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 3.
- Start engine. Turn steering wheel slowly to full lock position. Using backprobe set, measure voltage between PCM 32-pin connector "A" terminals No. 26 (Blue/Black wire) and 25-pin connector "B" terminal No. 20 (Brown/Yellow wire). If battery voltage exists momentarily, PSP switch signal is okay. If battery voltage does not exist momentarily, go to step 4.
- Turn ignition off. Disconnect EPS control module 14-pin connector. EPS control module is located at right rear of engine compartment, right of battery. See COMPONENT LOCATIONS . Turn ignition on. Measure voltage between ground and EPS control module 14-pin harness connector terminal No. 13 (Blue/Black wire). If battery voltage exists, substitute a known good EPS control module and recheck. If battery voltage does not exist, repair open in Blue/Black wire between EPS control module and PCM 32-pin connector "A" terminals No. 26.
- Turn ignition off. Disconnect EPS control module 14-pin connector. EPS control module is located at right rear of engine compartment, right of battery. Turn ignition on. Measure voltage between ground and EPS control module 14-pin harness connector terminal No. 13 (Blue/Black wire). If battery voltage exists, substitute a known good EPS control module and recheck. If battery voltage does not exist, go to next step.
- Turn ignition off. Disconnect ECM 32-pin connector "A". Check for continuity between ground and ECM 32-pin harness connector "A" terminal No. 26 (Blue/Black wire). If continuity exists, repair short in Blue/Black wire between EPS and ECM 32-pin connector "A". If continuity does not exist, substitute a known-good PCM and recheck. See SUBSTITUTING PCM in SELF-DIAGNOSTICS - INTRODUCTION article. If symptom or indication goes away, replace original PCM.
NOTE:
DO NOT hold steering wheel in full lock position for more then 5 seconds.
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.