NOTE: TP sensor is not adjustable. Replace TP sensor if voltage readings are not within specification.

Ensure throttle linkage is not preventing throttle stop lever from contacting throttle stop screw. Disconnect Electronic Control Assembly (ECA) 60-pin connector. Inspect connector for damaged pins, corrosion or loose wires and repair as necessary.
Connect Breakout Box (T83L-50-EEC-IV) between ECA and ECA harness. Connect digital voltmeter positive lead to pin No. 47 and negative lead to pin No. 46 of breakout box.
Turn ignition on. Observe voltmeter while slowly moving throttle between fully closed and wide open positions. Voltage should be .60 volt with throttle fully closed and about 4.50 volts throttle fully open.
If voltages values are not as specified, ensure throttle angle (minimum air rate) is correct. See IDLE SPEED under IDLE SPEED & MIXTURE. If throttle angle is correct, remove TP sensor.
Check for damaged, corroded or misadjusted pins. If pins are okay, install TP sensor. Check voltage readings again. If voltage readings are not as specified, perform KOEO self-test. See information G - TEST W/ CODES article. If KOEO self-test indicates no problems, replace TP sensor.

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.

Safety Warning

Throttle Position (TP) Sensor: NAVAJO