Chrysler Full-Size Vans 1989-1998 Repair Guide

Throttle Position Sensor



The Throttle Position (TP) sensor is a potentiometer that provides a signal to the ECM that is directly proportional to the throttle plate position. The TP sensor is mounted on the side of the throttle body and is connected to the throttle plate shaft. The TP sensor monitors throttle plate movement and position, and transmits an appropriate electrical signal to the ECM. These signals are used by the ECM to adjust the air/fuel mixture, spark timing and EGR operation according to engine load at idle, part throttle, or full throttle. The TP sensor is not adjustable.


See Figures 1, 2, 3, 4 and 5

  1. Remove the engine cover.
  3. Remove the air cleaner assembly.
  5. With the engine OFF and the ignition ON , check the voltage at the center terminal of the TP sensor by carefully backprobing the connector.
  7. Voltage should be between 0.2 and 1.4 volts at idle, and less than 4.8v at Wide Open Throttle (WOT). If the TP sensor does not meet these specifications, replace it.
  9. If no voltage is present, check the wiring harness for supply voltage (5.0v) and ground (0.3v or less), by referring to your corresponding wiring guide. If supply voltage and ground are present, but no output voltage from TP, replace the TP sensor. If supply voltage and ground do not meet specifications, make necessary repairs to the harness or ECM.
  11. Replace the air cleaner assembly.
  13. Replace the engine cover.

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Fig. Fig. 1: The TP sensor's electrical connector terminal identification-MFI engines

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Fig. Fig. 2: The TP sensor circuit schematic

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