NOTE: All testing procedures are made with engine at normal operating temperature.

Disconnect TPS electrical connector. With throttle valve at idle position, apply approximately 16-20 in. Hg to throttle opener valve. See Figure . Ensure throttle valve is closed.
Insert a .016" (.41 mm) feeler gauge between throttle stop screw and throttle lever. See Figure . Connect ohmmeter between TPS terminals No. 1 and No. 4. See Fig 1 .
Rotate TPS fully clockwise, then slowly rotate counterclockwise until continuity exists. Hold TPS and tighten TPS screws to 31 INCH lbs. (3.5 N.m).
Check TPS resistance with throttle lever in different positions to ensure correct operation. See THROTTLE POSITION SENSOR (TPS) RESISTANCE table. Once properly adjusted, install electrical connector.

Fig 1: Throttle Position Sensor Terminal ID (Tracker)

Courtesy of GENERAL MOTORS CORP.

THROTTLE POSITION SENSOR (TPS) RESISTANCE

Application

Resistance

Condition

(Ohms)

Tracker

Between Terminals 1 & 4 ⁽¹⁾

12-18

⁽¹⁾	With .016" (.4 mm) feeler gauge installed between throttle stop screw and lever. DVOM connected to TPS terminals No. 1 (Green wire) and No. 4 (Black wire). With throttle valve at idle position, apply about 16-20 in. Hg to throttle opener valve.

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)