Chrysler Front Wheel Drive Cars 4-CYL 1981-1995 Repair Information

Manifold Air Temperature (MAT) Sensor

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OPERATION



Eagle Throttle Body Fuel Injection (TBI) System

The Eagle TBI system is used only on 2.5L Premier engines.

The MAT sensor is installed in the intake manifold with the sensor element extending into the air/fuel stream. As the temperature of the air/fuel stream in the manifold varies, the MAT sensors resistance changes, resulting in a different input voltage to the PCM.

TESTING



Eagle Throttle Body Fuel Injection (TBI) System

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Manifold Air Temperature (MAT) sensor resistance test chart

  1. Unplug the electrical connector from the MAT/charge temperature sensor.
  2.  
  3. Connect an ohmmeter between the terminals of the sensor. The sensor resistance should be as follows:

    Except Premier-with the engine cold, approximately 70°F (22°C), sensor resistance should be between 7,000-13,000 ohms
     
    Except Premier-with the engine at normal operating temperature, approximately 200°F (93°C), sensor resistance should be between 700-1000 ohms
     
    Premier-refer to the coolant sensor and MAT sensor resistance chart/illustration for the proper approximate values
     

  4.  
  5. If the resistance readings are not within specifications, replace the sensor with a new one, then retest the sensor.
  6.  

REMOVAL & INSTALLATION



The MAT sensor is located in the throttle body adapter below the throttle body and behind the fitting for the brake vacuum booster.

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the electrical connector from the sensor.
  4.  
  5. Unscrew the sensor from the adapter.
  6.  

To install:
  1. Install the sensor in the throttle body adapter.
  2.  
  3. Tighten the MAT sensor to 21 ft. lbs. (28 Nm) and the charge Temperature sensor to 50 inch lbs. (6 Nm).
  4.  
  5. Plug the electrical connector back into the MAT sensor.
  6.  
  7. Connect the battery cable.
  8.  

 
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