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.
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HOMESERVICE MANUALSHONDA1994PRELUDE S, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESTHROTTLE POSITION (TP) SENSOR
1994 Honda Prelude S, Standard
Throttle Position (TP) Sensor
1994 Honda Prelude S, StandardSECTION Throttle Position (TP) Sensor
- Turn ignition off. Connect test harness between ECM and vehicle harness connector. See Figure .
- Turn ignition on. Measure voltage between test harness terminals D11 and D22. Open and close throttle while observing voltmeter. Voltage should be about 0.5 volt with throttle fully closed and 4.5 volts with throttle wide open. Voltage should change smoothly as throttle opens and closes.
- If voltage is not as specified on Prelude M/T, replace TP sensor. If voltage is as specified, replace ECM and retest system. If voltage is not as specified on Prelude A/T, go to next step.
- Unplug 22-pin connector from Transmission Control Module (TCM). TCM is located below center of dashboard. Measure voltage again as throttle is opened and closed. If voltage does not change as specified in step 2), go to next step. If voltage now changes as specified, replace TCM.
- If voltage is not as specified, check for short or open in Red/Black wire between ECM terminal D11 and TP sensor. If wire is okay, replace TP sensor. If problem still exists, see TESTS W/CODES article in the ENGINE.PERFORMANCE Section
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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.