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 Figure for terminal identification.

THROTTLE POSITION SENSOR (TPS) RESISTANCE

Condition

Ohms

Between Terminals C & D ⁽¹⁾

0-500

Between Terminals C & D ⁽²⁾

No Continuity

Between Terminals A & D

3500-6500

Between Terminals B & D

At Idle ⁽³⁾

300-2000

At Wide Open Throttle

2000-6500

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

⁽²⁾	With .022" (.56 mm) feeler gauge installed between stop screw and lever.

⁽³⁾	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.