Component Testing

Multifunction Intake Air Sensor

1. Ignition Off, disconnect the harness connector at the B75C Multifunction Intake Air Sensor.
NOTE:

A thermometer can be used to test the sensor off the vehicle.

2. To test IAT Sensor 1, verify the resistance between terminals 1 - 3 of the sensor is within the range specified in the Temperature Versus Resistance - Intake Air Temperature Sensor (Hitachi Sensor)Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor) , table for Hitachi sensors, while varying the sensor between known temperatures.
   • If not within the specified range 

     Replace the B75C Multifunction Intake Air Sensor.

   • Go to next step: If within the specified range 
3. All OK.

Multifunction Intake Air Sensor

1. Test IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%.
   • If not within the specified range 

     Replace the B75C Multifunction Intake Air Sensor.

   • Go to next step: If within the specified range 
2. All OK.