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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  .

NOTE: See Fig 1 for terminal identification.
THROTTLE POSITION SENSOR (TPS) RESISTANCE

Application 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: Throttle Position Sensor Terminal ID
G121710Courtesy of GENERAL MOTORS CORP.
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