Throttle Position (TP) Sensor

Disconnect negative battery cable and TP sensor connector. See Fig 1 . Using an ohmmeter, check resistance between indicated terminals. See THROTTLE POSITION (TP) SENSOR RESISTANCE table.
If resistance is not as specified, adjust TP sensor. See appropriate ADJUSTMENTS article. If resistance is not as specified after adjustment, replace TP sensor. For further diagnostic procedures, see appropriate BASIC TESTING article. Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in the appropriate TESTS W/CODES article.

THROTTLE POSITION (TP) SENSOR RESISTANCE

Application

Ohms

Between Terminals No. 1 & 2

With .020" (.50 mm) Clearance At Stop Screw

0-500

With .031" (.80 mm) Clearance At Stop Screw

Infinity

Between Terminals No. 1 & 4

3500-6500

Between Terminals No. 1 & 3

At Idle

300-2000

At Wide Open Throttle

⁽¹⁾ 2000-6500

⁽¹⁾	There should be more than 2000 ohms difference between idle and wide open throttle resistance.

Fig 1: Identifying Throttle Position (TP) Sensor Terminals

Courtesy of GENERAL MOTORS CORP.