P0112 2005 TOYOTA HIGHLANDER - Intake Air Temperature Circuit Low Input
Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
When is the code detected?
An excessively low voltage from the sensor is sent to ECM.
Engine Light ON (or Service Engine Soon Warning Light)
P0112 2005 Toyota Highlander Description
The Intake Air Temperature
(IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM
).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature
signal is used as an input for various systems in the vehicle.