DTC P0112: Intake Air Temperature Sensor 1 Circuit Low Bank 1: Notes
1. -
DTC detecting condition:
Immediately at fault recognition
Trouble symptom:
- Improper idling
- Poor driving performance
Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .
Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .
After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
- CHECK DATA MONITOR
.
- Start the engine.
- Using the Subaru Select Monitor, read the value in [Intake Air Temp.].NOTE:
For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
Is the value of [Intake Air Temp.] 120[°C] (248°F) or more?
Yes : Go to 2 .
No : Even if DTC is detected, the circuit has returned to a normal condition at this time.
Reproduce the failure, and then perform the diagnosis again.
NOTE:In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
- CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR (SHORT TO GROUND)
.
- Turn the ignition switch to OFF.
- Disconnect the connector from ECM.
- Disconnect the connectors from the mass air flow and intake air temperature sensor.
- Measure the resistance between the ECM connector and engine ground.
Connector and terminal
(B62) No. 43 - Engine ground:
Is the resistance 1 MΩ or more?
Yes : Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .
No : Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.