P0037

P0037, P0038, P0057, P0058 HO2S2 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 between 10.5 V and 16 V at idle.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and warm it up to the normal operating temperature.
2.Turn ignition switch OFF and wait at least 10 seconds.
3.Turn ignition switch ON.
4.Turn ignition switch OFF and wait at least 10 seconds.
5.Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6.Let engine idle for 1 minute.
7.Check 1st trip DTC.
Is 1st tip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK HO2S2 POWER SUPPLY

1.Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
2.Turn ignition switch ON.
3.Check the voltage between HO2S2 harness connector and ground.
Revision: March 20122013 Infiniti JX





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK HO2S2 SENSOR 1 POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connector.
3.Check the continuity between HO2S2 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 HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between HO2S2 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 HEATED OXYGEN SENSOR 2 HEATER

Check heated oxygen sensor 2 heater. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace malfunctioning heated oxygen sensor 2. Refer to "Exploded View" Exploded View.


Component Inspection


1. CHECK HEATED OXYGEN SENSOR 2 HEATER

1.Turn ignition switch OFF.
2.Disconnect heated oxygen sensor 2 harness connector.
3.Check resistance between HO2S2 terminals as per the following.
Revision: March 20122013 Infiniti JX





Is the inspection result normal?
YES- INSPECTION END
NO- Replace malfunctioning heated oxygen sensor 2. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX