Chrysler Full-Size Vans 1989-1998 Repair Guide

Throttle Position Sensor

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OPERATION



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.

TESTING



See Figures 1, 2, 3, 4 and 5

  1. Remove the engine cover.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  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.
  6.  
  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.
  8.  
  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.
  10.  
  11. Replace the air cleaner assembly.
  12.  
  13. Replace the engine cover.
  14.  



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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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Fig. Fig. 3: Using a voltmeter to check the TP sensor for signal voltage



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Fig. Fig. 4: Using a voltmeter to check the TP sensor for reference (supply) voltage



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Fig. Fig. 5: You can use the data display function of the Auto Xray or other scan tool to get the TP sensor readings

REMOVAL & INSTALLATION



See Figures 6, 7 and 8

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine cover.
  4.  
  5. Remove the air cleaner assembly.
  6.  
  7. Unplug the TP sensor connector.
  8.  
  9. Remove the two retaining bolts.
  10.  
  11. Remove the TP sensor from the throttle body.
  12.  

To install:
  1. Install the TP sensor on the throttle body.
  2.  
  3. Tighten the TP sensor bolts to 60 inch lbs. (7 Nm) on 1993 and later vehicles, and 27 inch lbs. (3 Nm) on 1989-92 vehicles.
  4.  
  5. Open the throttle to WOT and back again several times to check for binding.
  6.  
  7. Plug in the connector for the TP sensor.
  8.  
  9. Install the air cleaner assembly.
  10.  
  11. Install the engine cover.
  12.  
  13. Connect the negative battery cable.
  14.  



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Fig. Fig. 6: TP sensor mounting on MFI vehicles



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Fig. Fig. 7: TP sensor mounting on TBI vehicles



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Fig. Fig. 8: Align the locating tangs on the TP sensor with the throttle shaft

 
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