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Home >> Honda >> 1994 >> Prelude VTEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Throttle Position (TP) Sensor
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Throttle Position (TP) Sensor

  1. Turn ignition off. Connect test harness between ECM and vehicle harness connector. See Figure .
  2. 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.
  3. 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.
  4. 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.
  5. 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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