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 .


Wiring Diagram








Diagnosis Procedure


1. CHECK GROUND CONNECTIONS

1.Turn ignition switch OFF.
2.Loosen and retighten ground screw on the body.
Power Supply And Ground Circuit.










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.
2.Turn ignition switch ON.





3.Check voltage between mass air flow sensor terminal 5 and ground with CONSULT or tester.
Voltage: Approximately 5.0 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 55.
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

.
OK or NG
OK- GO TO 5.
NG- Replace mass air flow sensor (with intake air temperature sensor). Component.

5. CHECK INTERMITTENT INCIDENT

Refer to Initial Inspection and Diagnostic Overview
-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). Component.