Mazda Trucks 1987-1993 Repair Guide

Intake Air Temperature (IAT) Sensor

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OPERATION



The Intake Air Temperature (IAT) sensor resistance changes in response to the intake air temperature. The sensor resistance decreases as the surrounding air temperature increases. This provides a signal to the PCM indicating the temperature of the incoming air charge.

Most engines mount the IAT sensor in the air cleaner-to-throttle body supply tube. However, some earlier engines have it mounted to the upper intake manifold.

TESTING



See Figures 1 and 2

Turn the ignition switch OFF .

  1. Disengage the wiring harness connector from the IAT sensor.
  2.  
  3. Using a Digital Volt-Ohmmeter (DVOM), measure the resistance between the two sensor terminals.
  4.  
  5. Compare the resistance reading with the accompanying chart. If the reading for a given temperature is approximately that shown in the table, the IAT sensor is okay.
  6.  
  7. Attach the wiring harness connector to the sensor.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: IAT and ECT sensor specifications chart-Navajo models



Click image to see an enlarged view

Fig. Fig. 2: IAT sensor specifications chart-Pick-up and MPV models

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Disengage the wiring harness connector from the IAT sensor.
  4.  
  5. Remove the sensor from the air cleaner outlet tube.
  6.  

To install:
  1. Wipe down the IAT sensor mounting boss to clean the sensor area of all dirt and grime.
  2.  
  3. Install the sensor into the air cleaner outlet tube (B Series Pick-up and Navajo) or upper intake manifold assembly securely.
  4.  
  5. Attach the wiring harness connector to the IAT sensor.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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