P0111

P0111 IAT SENSOR

Description






The intake air temperature sensor is built-into the mass air flow sensor (1). The sensor detects intake air temperature and transmits a signal to the 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 rise in temperature.





[Reference data]







DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. INSPECTION START

Is it necessary to erase permanent DTC?
YES- GO TO 3.
NO- GO TO 2.

2. PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to "Component Function Check" .
NOTE:
Use the component function check to check the overall function of the IAT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .

3. PRECONDITIONING

If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following procedure before conducting the next test.
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
-Before performing the following procedure, do not add fuel.
-Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
-Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
- GO TO 4.

4. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and let it idle for 60 minutes.
2.Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between 10�C (14�F) and 35�C (95�F).
3.Turn ignition switch OFF and soak the vehicle for 12 hours.

CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4.Start engine and let it idle for 5 minutes or more.

CAUTION:
Never turn ignition switch OFF during idling.
5.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Component Function Check


1. CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

1.Turn ignition switch OFF.
2.Disconnect mass air flow sensor (bank 1) harness connector.
3.Check resistance between mass air flow sensor (bank 1) terminals as follows.





Is the inspection result normal?
YES- GO TO 2.
NO- Proceed to "Diagnosis Procedure" .

2. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

Check intake air temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 2.
NO- Replace mass air flow sensor (with intake air temperature sensor) (bank 1). Refer to "Exploded View" Exploded View.

2. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END


Component Inspection


1. CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR

1.Turn ignition switch OFF.
2.Disconnect mass air flow sensor (bank 1) harness connector.
3.Check resistance between mass air flow sensor (bank 1) terminals as follows.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace mass air flow sensor (with intake air temperature sensor) (bank 1). Refer to "Exploded View" Exploded View.