Throttle Position Sensor

Disconnect TPS electrical connection. Install proper thickness feeler gauge between stop screw and lever. Using ohmmeter, check continuity or resistance between designated terminals. Adjust or replace TPS if not within specification. See THROTTLE POSITION SENSOR (TPS) RESISTANCE table.

NOTE: See Fig 1 for terminal identification.

THROTTLE POSITION SENSOR (TPS) RESISTANCE

Application Condition

Resistance (Ohms)

Between Terminals C-D

At Idle ⁽¹⁾

0-500

At Wide Open Throttle

Infinite

Between Terminals A-D

3,500-6,500

Between Terminals B-D

At Idle ⁽¹⁾

0-2,000

At Wide Open Throttle

2,000-6,500

⁽¹⁾	To position throttle valve at idle, apply approximately 18 in. Hg (vacuum) to throttle opener valve.

Fig 1: Identifying Throttle Position Sensor Terminals

Courtesy of GENERAL MOTORS CORP.