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Throttle Position Sensor (TPS)

NOTE: All testing procedures are made with engine at normal operating temperature.
  1. Remove air cleaner. Disconnect electrical connector from TPS. Loosen TPS retaining screws. Insert a .012" (.30 mm) feeler gauge between throttle lever and stop screw. Connect ohmmeter between TPS terminals No. 1 and No. 2. See Fig 1 .
  2. Rotate throttle switch fully clockwise, then slowly counterclockwise until ohmmeter indicates continuity. Hold TPS and tighten retaining screws to 18 INCH lbs. (2 N.m). Remove feeler gauge. Ohmmeter should still indicate continuity.
  3. Insert a .035" (.89 mm) feeler gauge between throttle lever and stop screw. Ohmmeter should indicate no continuity. Remove feeler gauge.
    CAUTION: DO NOT  use throttle stop screw to adjust throttle switch.
  4. To check proper TPS switch operation, check resistance or continuity with selected feeler gauge thickness between throttle lever and stop screw. See THROTTLE POSITION SENSOR (TPS) RESISTANCE  .
  5. Once properly adjusted, reinstall electrical connector and install air cleaner.
Fig 1: Throttle Position Sensor Terminal ID
G92F26646Courtesy of GENERAL MOTORS CORP.
THROTTLE POSITION SENSOR (TPS) RESISTANCE

Application Resistance (Ohms)
Between Terminals 1 & 2 (1) 0-5000
Between Terminals 1 & 2 (2) Infinity
Between Terminals 1 & 2 (3) 0
Between Terminals 1 & 4 4370-8130
Between Terminals 1 & 3 (3) 240-1140
Between Terminals 1 & 3 (4) 3170-6600
(1) With .012" (.30 mm) feeler gauge installed between throttle stop screw and lever.
(2) With .035" (.89 mm) feeler gauge installed between throttle stop screw and lever.
(3) Throttle valve at idle position.
(4) Throttle valve at fully open position.
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