P0112

P0112, P0113 IAT SENSOR

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following 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.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Turn ignition switch ON and wait at least 5 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY

1.Disconnect mass air flow sensor (with intake air temperature sensor) harness connector.
2.Turn ignition switch ON.
3.Check the voltage between mass air flow sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

2. 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 harness connector and ECM harness connector.





Revision: March 20122013 Infiniti JX
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

3. CHECK INTAKE AIR TEMPERATURE SENSOR

Check intake air temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace mass air flow sensor. Refer to "Exploded View" Exploded View.


Component Inspection


1. CHECK INTAKE AIR TEMPERATURE SENSOR

1.Turn ignition switch OFF.
2.Disconnect mass air flow sensor harness connector.
3.Check resistance between mass air flow sensor terminals as per the following.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace mass air flow sensor. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX