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Throttle Position (TP) Sensor: Inspection

NOTE: Perform all testing procedures with engine at normal operating temperature.
  1. Disconnect negative battery cable. Disconnect electrical connector from TP sensor. Loosen TP sensor retaining screws.
  2. To check proper TP sensor operation, using ohmmeter, check resistance or continuity with selected feeler gauge thickness between throttle lever and stop screw. See Figure - Figure . Also, refer to the THROTTLE POSITION (TP) SENSOR RESISTANCE  .
  3. If TP sensor resistances are not as specified, adjust or replace TP sensor. See ADJUSTMENTS  . Once properly adjusted, reconnect electrical connector.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Application Ohms
TBI - Federal
Between Terminals 2 & 4 3500-6500
Between Terminals 3 & 4 (1) 0-500
Between Terminals 3 & 4 (4) Infinity
Between Terminals 4 & 5 (2) 300-2000
Between Terminals 4 & 5 (3) 2000-6500
MFI - Calif. & New York
Between Terminals 1 & 3 3500-6500
Between Terminals 1 & 2 (5) 0-500
Between Terminals 1 & 2 (6) Infinity
Between Terminals 1 & 4 (2) 300-2000
Between Terminals 1 & 4 (3) 2000-6500
(1) With .012" (.30 mm) feeler gauge installed between throttle stop screw and lever.
(2) Throttle valve at idle position.
(3) Throttle valve at fully open position.
(4) With .022" (.56 mm) feeler gauge installed between throttle stop screw and lever.
(5) With .020" (.50 mm) feeler gauge installed between throttle stop screw and lever.
(6) With .031" (.80 mm) feeler gauge installed between throttle stop screw and lever.
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