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

Disconnect negative battery cable. Remove air cleaner. 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. SeeFigure and Figure . Refer to the THROTTLE POSITION (TP) SENSOR RESISTANCE table.
If TP sensor resistances are not as specified, adjust or replace TP sensor. See procedure under ADJUSTMENTS. Once properly adjusted, reconnect electrical connector and install air cleaner.

THROTTLE POSITION (TP) SENSOR RESISTANCE

Application

Ohms

Between Terminals 1 & 2 ⁽¹⁾

0-5000

Between Terminals 1 & 2 ⁽²⁾

Infinity

Between Terminals 1 & 2 ⁽³⁾

0-5000

Between Terminals 1 & 3 ⁽³⁾

240-1140

Between Terminals 1 & 3 ⁽⁴⁾

3170-6600

Between Terminals 1 & 4

4370-8130

⁽¹⁾	With .012" (.30 mm) feeler gauge installed between throttle stop screw and lever.

⁽²⁾	With .035" (.89 mm) feeler gauge installed between throttle stop screw and lever.

⁽³⁾	Throttle valve at idle position.

⁽⁴⁾	Throttle valve at fully open position.

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