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Home >> Geo >> 1995 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 1.0L 3-CYL >> Computerized Engine Controls >> Engine Sensors & Switches >> Throttle Position (TP) Sensor
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Throttle Position (TP) Sensor

  1. A malfunction in the throttle position sensor circuit will set DTCs 21 and/or 22. For testing and adjusting procedures, see THROTTLE POSITION (TP) SENSOR in ADJUSTMENTS - 1.0L 3-CYL article. Use the following procedure to diagnose TP sensor.
  2. Insert a .14" (3.5 mm) feeler gauge between throttle stop screw and throttle lever. Check Idle Speed Control (ISC) motor plunger for contact with throttle lever screw. If ISC motor plunger is contacting throttle lever screw, engine must be brought to operating temperature.
  3. Connect a Tech 1 scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool read TP sensor voltage. If voltage is not 0.98-1.02 volts, adjust TP sensor. Loosen TP sensor mounting screws and turn TP sensor until voltage is as specified. See THROTTLE POSITION (TP) SENSOR VOLTAGE  table.
THROTTLE POSITION (TP) SENSOR VOLTAGE

Application Volts
1.0L (1) .98-1.02
(1) Install .14" (3.5 mm) feeler gauge between throttle stop screw and throttle lever. If Idle Speed Control (ISC) motor plunger contacts throttle lever screw, bring engine to operating temperature. Using a Tech 1 connected to DLC, ensure TP sensor voltage is .98-1.02 volts. Adjust or replace TP sensor as necessary.
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