Chrysler Concorde/Intrepid/LHS/New Yorker/Vision 1993-1997

Vehicle Speed Sensor

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OPERATION



The vehicle speed sensor supplies the vehicle speed and distance inputs to the PCM. The speed sensor is located in the transaxle extension housing to sense vehicle motion.

The speed and distance signals, along with a closed throttle signal from the TPS, determine if a closed throttle deceleration or normal idle condition (vehicle stopped) exists. Under deceleration conditions, the PCM adjusts the idle air control motor to maintain a desired MAP value. Under idle conditions, the PCM adjusts the idle air control motor to maintain a desired engine speed.

TESTING



See Figures 1, 2 and 3



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Fig. Fig. 1: Wiring schematic for the vehicle speed sensor-1993-95 models



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Fig. Fig. 2: Wiring schematic for the vehicle speed sensor-1996-97 models



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Fig. Fig. 3: PCM and TCM pin terminal ID for the vehicle speed sensor

Before testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged.

  1. Unplug the vehicle speed sensor wiring connector.
  2.  
  3. Turn the ignition ON .
  4.  
  5. Using a voltmeter, measure the voltage from the cavity 58 (white/orange) wire with the terminal of the wiring harness connector to a good ground. Refer to the accompanying wiring illustration. The power supplied to the sensor should be at least 4.0 volts; if it is not, then a problem lies with the circuit, the transaxle control module or the PCM. These systems should be inspected before proceeding with this test.
  6.  
  7. Connect an ohmmeter between the speed sensor signal circuit and check for resistance.
  8.  
  9. If the resistance is above 5.0 ohms, there is an open in the speed sensor signal circuit which must be repaired.
  10.  
  11. If the resistance is below 5.0 ohms. Use an ohmmeter probe cavity 47 (1993-95) and 66 (1996-97) of the PCM connector. See the accompanying illustrations. There is a short to ground in the speed sensor circuit.
  12.  
  13. If not, replace the PCM.
  14.  

REMOVAL & INSTALLATION



Input Sensor

See Figure 4



Click image to see an enlarged view

Fig. Fig. 4: Exploded view of the vehicle speed sensors located on the side of the transaxles

When the vehicle speed sensor is removed for any reason, a new O-ring must be installed on its outside diameter. The input and output speed sensors are NOT interchangeable.

The input speed sensor is located on the left side of the transaxle case.

  1. Raise and support the front of the vehicle safely on jackstands.
  2.  
  3. Unplug the harness connector from the sensor. Make sure that the weatherseal stays on the harness connector.
  4.  
  5. Unscrew the sensor from the transaxle.
  6.  
  7. Place a pan under the sensor to catch any transaxle fluid which may leak out of the sensor mounting hole (not much, if any, will leak out unless the vehicle is now moved).
  8.  
  9. Carefully pull the sensor out of the transaxle case.
  10.  

To install:
  1. Install a new O-ring to the sensor.
  2.  
  3. Carefully thread the sensor back into the transaxle housing.
  4.  
  5. Tighten the sensor to 180-300 inch lbs. (20-34 Nm).
  6.  
  7. Plug the sensor connector back into the wiring harness.
  8.  
  9. Lower the vehicle.
  10.  

Output Sensor

When the vehicle speed sensor is removed for any reason, a new O-ring must be installed on its outside diameter. The input and output speed sensors are NOT interchangeable.

The output speed sensor is located on the left side of the transaxle case.

  1. Raise and support the front of the vehicle safely on jackstands.
  2.  
  3. Unplug the harness connector from the sensor. Make sure that the weatherseal stays on the harness connector.
  4.  
  5. Unscrew the sensor from the transaxle.
  6.  
  7. Place a pan under the sensor to catch any transaxle fluid which may leak out of the sensor mounting hole (not much, if any, will leak out unless the vehicle is now moved).
  8.  
  9. Carefully pull the sensor out of the transaxle case.
  10.  

To install:
  1. Install a new O-ring to the sensor.
  2.  
  3. Carefully thread the sensor back into the transaxle housing.
  4.  
  5. Tighten the sensor to 180-300 inch lbs. (20-34 Nm).
  6.  
  7. Plug the sensor connector back into the wiring harness.
  8.  
  9. Lower the vehicle.
  10.  

 
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