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 ADJUSTMENTS - 1.8L article. If resistance is not as specified after adjustment, replace TP sensor. For further diagnostic procedures, see TESTS W/CODES - 1.8L 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.