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To check input voltage, turn ignition switch to the "ON" position. Locate the square TPS connector with 4 terminals marked "A", "B", "C" and "D". DO NOT disconnect connector.
Without damaging sensor wires, insert negative lead of voltmeter into the back of terminal "D" and insert positive lead into back of terminal "A". Note sensor input voltage reading between terminals "A" and "D".
To check output voltage, remove voltmeter positive lead from sensor terminal "A" and insert it into back of terminal "B". Note sensor output voltage between terminals "B" and "D".
Divide output voltage reading by input voltage reading. The desired results should be between .825-.835 volts (.830 volts being ideal). Adjust TPS if necessary.
NOTE: For example: if input voltage is 5.0 volts and output voltage is 4.15 volts, divide 4.15 by 5 (4.15/5 =.83). The result would be .83 volts, or 83%.
If a large TPS adjustment is necessary, loosen bottom mounting screw and pivot top of sensor until proper reading is achieved. If a fine adjustment is necessary, loosen top sensor mounting screw and pivot bottom of sensor until proper reading is achieved. Remove voltmeter.

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 Sensor (TPS) Testing - A/T