Operation CHARM: Car repair manuals for everyone.
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Sensor Inspection

1. Disconnect the Air Flow Sensor connector.

MPI Relay Circuitry:






2. Connect an ohmmeter to terminals # 5 and # 6 of the sensor connector.

Heating IAT Sensor:






3. While heating the temperature sensor with a hair dryer, measure the resistance.
As the temperature increases, the resistance should decrease.