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Ford Bronco TPS Adjustment Procedure - Set Throttle Position Sensor .96-.98V
Numbered TPS calibration procedure: install jumper harness inline, warm engine, disconnect IAC, set idle, rotate sensor to .96-.98 volts, then reset PCM by disconnecting the battery.
This document is one page of a service procedure for adjusting a Throttle Position Sensor (TPS), uploaded to a 1994 Ford Bronco gallery. The partially visible introduction explains that a meter's negative lead connects to the black wire, that sensor housing holes may need elongation due to production variations, and that TPS voltage should be checked whenever engine idle is adjusted. The main content is an 11-step procedure: connect a jumper harness inline with the factory TPS wiring, warm the engine to operating temperature, disconnect the Idle Air Control (IAC) solenoid (turning the throttle-stop screw in one full turn if the engine stalls), set idle with the throttle stop, and adjust the TPS to between .96 and .98 volts by loosening its mounting screws and rotating it (drilling the mounting holes larger if needed). The procedure then directs the user to disconnect the negative battery cable for 15-20 minutes (tapping the brakes or cycling headlights to purge residual current and reset the computer to factory defaults), remove the jumper harness, reconnect the factory TPS wiring, IAC solenoid, and battery cable, restart the engine, and — if problems persist — inspect for mass air meter issues and vacuum leaks. References to Figure 1 and Figure 2 Item 11 suggest accompanying diagrams on other pages.
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Frequently asked questions
- What voltage should the TPS be set to?
- The document says to set the TPS anywhere from .96 to .98 volts by loosening the mounting screws and lightly rotating the TPS.
- What do I do if the engine stalls when I disconnect the IAC solenoid?
- Turn the throttle-stop screw in one full turn and restart the engine (referenced as Figure 2 Item 11).
- How do I reset the computer to factory defaults after adjusting the TPS?
- Stop the engine and disconnect the negative battery cable for 15-20 minutes. Tapping the brakes or turning the headlights on and off a few times helps purge remaining electrical current, resetting the computer to factory defaults.
- What if I can't rotate the TPS enough to reach the desired voltage range?
- The document says you may need to make the mounting holes slightly larger by drilling them; the intro also notes holes in the sensor housing may require elongation.
- What should I check if the problem persists after the TPS adjustment?
- Step 11 says to inspect for mass air meter problems and possible vacuum leaks.
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