Nissan Murano: Dtc/circuit Diagnosis / P0037 Ho2s2 Heater

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

P0037

• Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)

• Heated oxygen sensor 2 heater

P0038

• Harness or connectors (The heated oxygen sensor 2 heater circuit is shorted.)

• Heated oxygen sensor 2 heater

P0057

• Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)

• Heated oxygen sensor 2 heater

P0058

• Harness or connectors (The heated oxygen sensor 2 heater circuit is shorted.)

• Heated oxygen sensor 2 heater

FAIL-SAFE

Not applicable

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.

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?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

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.

   DTC	HO2S2			Ground	Voltage
   	Bank	Connector	Terminal
   P0037, P0038	1	F62	1	Ground	Battery voltage
   P0057, P0058	2	F54	1

Is the inspection result normal?

GO TO 3.

GO TO 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?

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

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.

   DTC	HO2S2			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P0037, P0038	1	F62	2	F78	7	Existed
   P0057, P0058	2	F54	2		47

4. Also check harness for short to ground and short to power.

Is the inspection result normal?

GO TO 4.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK HEATED OXYGEN SENSOR 2 HEATER

Check heated oxygen sensor 2 heater. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace malfunctioning heated oxygen sensor 2. Refer to Removal and Installation (bank 2), Removal and Installation (bank 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.

   +	−	Resistance
   Heated oxygen sensor 2
   Terminal
   1	2	3.0 Ω [at 25°C (77°F)]
   3	1	∞Ω (Continuity should not exist)
   	2
   	4
   4	1
   	2
   	3

Is the inspection result normal?

INSPECTION END

Replace malfunctioning heated oxygen sensor 2. Refer to Removal and Installation (bank 2), Removal and Installation (bank 1).