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Throttle Position (TP) Sensor

  1. A malfunction in the throttle position sensor circuit will set diagnostic trouble Code 41. For testing and adjusting procedures, see THROTTLE POSITION (TP) SENSOR in ADJUSTMENTS article in this section. Use the following procedure to diagnose TP sensor.
  2. Using ohmmeter, measure resistance or continuity of throttle position sensor between designated terminals with selected feeler gauge thickness between throttle lever and stop screw. See Fig 1 . Adjust or replace TP sensor if resistance is not within specification. See THROTTLE POSITION (TP) SENSOR RESISTANCE  .
Fig 1: Identifying TP Sensor Terminals
G93F78118Courtesy of GENERAL MOTORS CORP.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Application Ohms
Between Terminals E2 & IDL (1) 0-2300
Between Terminals E2 & IDL (2) Infinity
Between Terminals E2 & VC 4000-8500
Between Terminals E2 & VTA (3) 200-6000
Between Terminals E2 & VTA (4) 3300-10,000
(1) With .016" (.40 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) With zero clearance between throttle stop screw and lever.
(4) Throttle valve at fully open position.
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