P0031

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

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.
TESTING CONDITION:


Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and let it idle for at least 10 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NG- INSPECTION END


Diagnosis Procedure


1. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

1.Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2.Turn ignition switch ON.
3.Check the voltage between A/F sensor 1 harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
Revision: March 20122013 Infiniti JX
NO- GO TO 2.

2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connector.
3.Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.





Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

3. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness continuity between A/F sensor 1 harness connector and ECM harness connector.





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

4. CHECK A/F SENSOR 1 HEATER

Check A/F sensor 1 heater. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to "Exploded View" Exploded View.


Component Inspection


1. CHECK AIR FUEL RATIO (A/F) SENSOR 1

1.Turn ignition switch OFF.
2.Disconnect A/F sensor 1 harness connector.
3.Check resistance between A/F sensor 1 terminals as per the following.





Is the inspection result normal?
YES- INSPECTION END
Revision: March 20122013 Infiniti JX
NO- Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX