Jeep Wagoneer/Commando/Cherokee 1984-1998

Intake Manifold Air Temperature (MAT) Sensor

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OPERATION



See Figures 1 and 2

The intake manifold air temperature sensor, or MAT sensor is mounted on the intake manifold and provides the PCM with intake air temperature information. The sensor is a temperature dependent resistor. As the temperature of the air rises, the sensor resistance drops and as the temperature of the air drops, the sensor resistance rises.



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Fig. Fig. 1: Intake Manifold Air Temperature (MAT) Sensor-1996 5.2L engine shown



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Fig. Fig. 2: Intake Manifold Air Temperature (MAT) Sensor-1996 4.0L engine shown

TESTING



See Figure 3



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Fig. Fig. 3: Performing a resistance test on the MAT sensor

  1. Remove the MAT sensor from the intake manifold.
  2.  
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4.  
  5. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the ambient air. Refer to the Sensor Resistance Chart.
  6.  
  7. Repeat the test at two other temperature points, heating or cooling the air as necessary with a hair dryer or other suitable tool.
  8.  
  9. If the sensor does not meet specification, it must be replaced.
  10.  

Removal & Installation



  1. Disengage the MAT sensor wiring harness and unscrew the sensor.
  2.  

To install:
  1. Screw in the sensor and tighten it to 20 ft. lbs. (28 Nm).
  2.  
  3. Engage the sensor wiring connector.
  4.  

 
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