NOTE: Perform all testing procedures with engine at normal operating temperature.

Disconnect negative battery cable. Disconnect electrical connector from TP sensor. Loosen TP sensor retaining screws.
To check proper TP sensor operation, using ohmmeter, check resistance or continuity with selected feeler gauge thickness between throttle lever and stop screw. See Figure and Figure . See THROTTLE POSITION (TP) SENSOR RESISTANCE table.
If TP sensor resistances are not as specified, adjust or replace TP sensor. See PRIZM procedure under ADJUSTMENTS. Once properly adjusted, reconnect electrical connector.

THROTTLE POSITION (TP) SENSOR RESISTANCE

Application

Ohms

Prizm & Prizm LSi

Between Terminals E2 & IDL ⁽³⁾

0-2300

Between Terminals E2 & IDL ⁽¹⁾

Infinity

Between Terminals E2 & VC

4000-8500

Between Terminals E2 & VTA ⁽⁴⁾

200-6000

Between Terminals E2 & VTA ⁽²⁾

3300-10,000

⁽¹⁾	With .035" (.89 mm) feeler gauge installed between throttle stop screw and lever.

⁽²⁾	Throttle valve at fully open position.

⁽³⁾	With .016" (.40 mm) feeler gauge installed between throttle stop screw and lever.

⁽⁴⁾	With zero clearance between throttle stop screw and lever.

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: Inspection