Nissan Murano: Dtc/circuit Diagnosis / P0139 Ho2s2

DTC Description

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the switching response of the sensor's voltage is faster than specified during various driving conditions such as fuel cut.

The switching time between rich and lean of a heated oxygen sensor 2 signal delays more than the specified time computed by ECM.

POSSIBLE CAUSE

P0139

• Harness or connectors (The sensor circuit is open or shorted)

• Heated oxygen sensor 2

• Fuel pressure

• EVAP system

• Intake air system

P0159

• Harness or connectors (The sensor circuit is open or shorted)

• Heated oxygen sensor 2

• Fuel pressure

• EVAP system

• Intake air system

FAIL-SAFE

Not applicable

CHECK DTC PRIORITY

If DTC P0139 or P0159 is detected with DTC P0137, P0138, P0157 or P0158, perform trouble diagnosis for DTC P0137, P0138, P0157 or P0158.

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index.

GO TO 2.

INSPECTION START

Do you have CONSULT?

Do you have CONSULT?

GO TO 3.

GO TO 8.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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:

For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30°C (32 to 86°F).

GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Turn ignition switch ON.

5. Turn ignition switch OFF and wait at least 10 seconds.

6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

7. Let engine idle for 1 minute.

8. Make sure that “COOLANT TEMP/S” indicates more than 70°C (158°F).

9. Drive the Nissan Murano vehicle in a proper gear at 60 km/h (38MPH) and maintain the speed.

   CAUTION:

   Always drive Nissan Murano vehicle at a safe speed.

10. Release the accelerator pedal fully at least 5 seconds.

    CAUTION:

    • Enable the engine brake.

    • Always drive carefully.

    • Never apply brake when releasing the accelerator pedal.

11. Repeat step 9 and 10 at least 8 times.

12. Check the following item of “DATA MONITOR”.

    DTC	Data monitor item	Status
    P0139	HO2 S2 DIAG1 (B1)	CMPLT
    	HO2 S2 DIAG2 (B1)
    P0159	HO2 S2 DIAG1 (B2)
    	HO2 S2 DIAG2 (B2)

Is “CMPLT” displayed on CONSULT screen?

GO TO 7.

Perform DTC confirmation procedure again.

GO TO 5.

PERFORM DTC WORK SUPPORT

1. Open engine hood.

2. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT.

3. Start engine and follow the instruction of CONSULT display.

   NOTE:

   It will take at most 10 minutes until “COMPLETED” is displayed.

Is “COMPLETED” displayed on CONSULT screen?

GO TO 7.

GO TO 6.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

1. Turn ignition switch OFF and leave the Nissan Murano vehicle in a cool place (soak the vehicle).

2. Perform DTC confirmation procedure again.

GO TO 4.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform ECM self-diagnosis.

Is DTC “P0139” or “P0159” detected?

Proceed to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT

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 the voltage between ECM harness connector terminals under the following conditions.

   DTC	ECM			Condition	Voltage
   	Connector	+	–
   		Terminal
   P0139	F78	41	35	Revving up to 4,000 rpm under no load at least 10 times	A change of voltage should be more than 0.28 V for 1 second during this procedure.
   P0159		32

Is the inspection result normal?

INSPECTION END

GO TO 9.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

INSPECTION END

GO TO 10.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

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

Confirmation after repair: INSPECTION END

Proceed to Diagnosis Procedure.

CHECK DTC PRIORITY

If DTC P0139 or P0159 is detected with DTC P0137, P0138, P0157 or P0158, perform trouble diagnosis for DTC P0137, P0138, P0157 or P0158.

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index.

GO TO 2.

CLEAR MIXTURE RATIO SELF-LEARNING VALUE

1. Clear the mixture ratio self-learning value. Refer to Description.

2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?

Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to DTC Description or DTC Description.

GO TO 3.

CHECK HO2S2 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect heated oxygen sensor 2 harness connector.

3. Disconnect ECM harness connector.

4. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness connector.

   DTC	HO2S2			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P0139	1	F62	4	F78	35	Existed
   P0159	2	F54	4

5. 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 HO2S2 INPUT SIGNAL CIRCUIT

1. Check the continuity between HO2S2 harness connector and ECM harness connector.

   DTC	HO2S2			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P0139	1	F62	3	F78	41	Existed
   P0159	2	F54	3		32

2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.

   DTC	HO2S2			Ground	Continuity
   	Bank	Connector	Terminal
   P0139	1	F62	3	Ground	Not existed
   P0159	2	F54	3

   DTC	ECM		Ground	Continuity
   	Connector	Terminal
   P0139	F78	41	Ground	Not existed
   P0159		32

3. Also check harness for short to power.

Is the inspection result normal?

GO TO 5.

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

CHECK HEATED OXYGEN SENSOR 2

Check heated oxygen sensor 2. 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).

INSPECTION START

Will CONSULT be used?

Will CONSULT be used?

GO TO 2.

GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.

2. Start engine and warm it up to the normal operating temperature.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5. Let engine idle for 1 minute.

6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item with CONSULT.

7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ± 25%.

   

   	: The voltage should be above 0.72 V at least on time.
   	: The voltage should be below 0.27 V at least on time.

   “HO2S2 (B1)/(B2)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.

   “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is − 25%.

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-I

Without CONSULT

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

5. Check the voltage between ECM harness connector terminals under the following conditions.

   ECM			Condition	Voltage
   Connector	+	–
   	Terminal
   F78	32	35	Revving up to 4,000 rpm under no load at least 10 times	The voltage should be above 0.72 V at least once during this procedure. The voltage should be below 0.27 V at least once during this procedure.
   	41

Is the inspection result normal?

INSPECTION END

GO TO 4.

CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

INSPECTION END

GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

Check the voltage between ECM harness connector terminals under the following conditions.

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).