P0112

DTC P0112, P0113 IAT SENSOR





Component 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]









On Board Diagnosis Logic









DTC Confirmation Procedure

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to P0112.




Wiring Diagram

EC-IATS-01:

Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body.
Ground Inspection.











OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT





1. Disconnect mass air flow sensor (with intake air temperature sensor) (1) harness connector.
Arrow Indicates Vehicle front
2. Turn ignition switch ON.





3. Check voltage between mass air flow sensor terminal 5 and ground with CONSULT-III or tester.

Voltage: Approximately 5 V

OK or NG
OK - GO TO 3.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 56. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 4.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK INTAKE AIR TEMPERATURE SENSOR
P0112.
OK or NG
OK - GO TO 5.
NG - Replace mass air flow sensor (with intake air temperature sensor).
5.CHECK INTERMITTENT INCIDENT
Description Diagnosis Procedure.
- INSPECTION END




Component Inspection

INTAKE AIR TEMPERATURE SENSOR





1. Check resistance between mass air flow sensor (1) terminals 5 and 6 under the following conditions.





2. If NG, replace mass air flow sensor (with intake air temperature sensor).









Removal and Installation

MASS AIR FLOW SENSOR
Service and Repair.