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. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance - Intake Air Temperature Sensor table for Bosch Sensors. The resistance values should be in range of the table values.
   • If not within the specified range. 

     Replace the B75C Multifunction Intake Air sensor.

   • If within the specified range. 
3. All OK

Multifunction Intake Air Sensor

1. Test the 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 5% 

     Replace the B75C Multifunction Intake Air sensor.

   • If within 5% 
2. All OK.