What voltage should the TPS be set to at idle?

The instructions say to set the TPS anywhere from .96 to .98 volts; a reading of .98-1 volt at idle is considered desirable for performance service.

How do you connect the voltmeter to the TPS?

The meter's positive lead connects to the sensor's green wire and the negative lead goes to the black wire, with the engine off and ignition key switched on.

What is the normal TPS signal voltage range?

Ford service literature shows the throttle position sensor's signals range between .6 and 4.585 volts — the lower number indicating closed throttle and the higher signaling wide-open throttle. A 1 volt idle setting produces 4.6-4.8 volts at wide open throttle.

How do you reset the computer 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 helps purge remaining electrical current. This resets the computer to factory defaults.

What if I can't get the TPS into the desired voltage range?

Loosen the mounting screws and lightly rotate the TPS; if the range still can't be reached, the mounting holes may need to be made slightly larger by drilling them.

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Fiveology Racing TPS Calibration Kit Instructions - Ford 5.0 TPS Adjustment

Fiveology Racing TPS calibration kit instructions: set TPS .96-.98V at idle

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Fiveology Racing TPS calibration kit instruction sheet: throttle position sensor signals .6-4.585V, set idle to .96-.98 volts by rotating the sensor; green wire positive, black ground.

AI caption November 2013 · Photo 1090 of 3001

This document is the instruction sheet for the Fiveology Racing TPS Calibration Kit, a jumper harness used to check and adjust the throttle position sensor (TPS) on Ford EEC-equipped engines (the text references Ford 'five-oh' / 5.0L service literature). It explains that the TPS is a rotary potentiometer mounted on the bottom of the throttle body, with a signal range of .6 to 4.585 volts (closed throttle to wide-open throttle). With key on/engine off, the sensor should read .85-1 volt; a reading of .98-1 volt at idle is desirable for performance use, and 1 volt at idle yields 4.6-4.8 volts at WOT. Voltmeter hookup is specified: positive lead to the sensor's green wire, negative lead to the black wire. An 11-step procedure follows: connect the jumper harness inline with factory TPS wiring, warm the engine, disconnect the IAC solenoid, set idle with the throttle stop, adjust TPS to .96-.98 volts (drilling/elongating mounting holes if needed), disconnect the battery negative terminal for 15-20 minutes to reset the computer, then reconnect everything and restart. It also advises checking for mass air meter problems and vacuum leaks if issues persist. A photo shows the supplied inline jumper harness with connectors.

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Frequently asked questions

What voltage should the TPS be set to at idle?: The instructions say to set the TPS anywhere from .96 to .98 volts; a reading of .98-1 volt at idle is considered desirable for performance service.
How do you connect the voltmeter to the TPS?: The meter's positive lead connects to the sensor's green wire and the negative lead goes to the black wire, with the engine off and ignition key switched on.
What is the normal TPS signal voltage range?: Ford service literature shows the throttle position sensor's signals range between .6 and 4.585 volts — the lower number indicating closed throttle and the higher signaling wide-open throttle. A 1 volt idle setting produces 4.6-4.8 volts at wide open throttle.
How do you reset the computer 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 helps purge remaining electrical current. This resets the computer to factory defaults.
What if I can't get the TPS into the desired voltage range?: Loosen the mounting screws and lightly rotate the TPS; if the range still can't be reached, the mounting holes may need to be made slightly larger by drilling them.