Intake Air Temperature (Iat) Sensor; Operation; Testing; Removal & Installation - Ford Ranger Maintaince And Repair Manual

7. Refill the engine cooling system.
8. Start the engine, check for coolant leaks and top off the cooling system.

Intake Air Temperature (IAT) Sensor

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

Turn the ignition switch OFF.
1. Disengage the wiring harness connector from the IAT sensor.
2. Using a Digital Volt−Ohmmeter (DVOM), measure the resistance between the two sensor terminals.
3. 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.
4. Attach the wiring harness connector to the sensor.
REMOVAL & INSTALLATION
1. Disconnect the negative battery cable.
REMOVAL & INSTALLATION
HOW TO USE THIS BOOK
IAT sensor wiring harness connections
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