II. LF TRITEC Engine
1. DTC: P0112, Intake Air Temperature Sensor Temperature Too Low (see Table 1-14)
Table 1-14
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Go to step 5
2
Check the “intake air temperature” as per the data flow. Does it
match with the temperature within the intake pipe (related to the
temperature of the engine at that moment)?
Note: If the temperature is often -40 , open circuit may occur.℃
No Next step
Yes Next step
3
Disconnect the intake air temperature sensor from the harness.
Measure the resistance between pin 1# and pin 2# of the sensor
with a multimeter. Does the resistance match with its temperature
(refer to relevant part of the manual)?
No Replace sensor
Yes Go to step 5
4
Disconnect the intake air temperature sensor from the harness.
Measure the voltage between pin 1# and pin 2# with a
multimeter. Is the voltage about 5V?
No Next step
Yes
Repair or replace
harness
5
Check for open circuit or short to the power supply between pin
17#, 40# of the ECU and the pin 1#, 2# of the sensor with a
multimeter.
No Next step
Yes Diagnosis help
6
Start the engine, and keep idle speed. Check the “intake air
temperature” on the diagnostic instrument. At this moment, the
temperature will increase with the rise of the engine intake air
temperature.
No Replace sensor
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