Nissan X-Trail 32. Manual - part 876

P0137 HO2S2

EC-633

< DTC/CIRCUIT DIAGNOSIS >

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• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard

surface such as a concrete floor; use a new one.

• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner

[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).

>> INSPECTION END

EC-634

< DTC/CIRCUIT DIAGNOSIS >

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P0138 HO2S2

P0138 HO2S2

DTC Description

INFOID:0000000010986343

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 (manifold) causes the longer switching
time.
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the voltage is unusually high during the various driving con-
dition such as fuel-cut.

MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during the
various driving condition such as fuel-cut.

POSSIBLE CAUSE

DTC P0138 - A

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

DTC P0138 - B

• Harness or connectors (The sensor circuit is open or shorted.)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

PBIB1848E

PBIB2376E

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0138

HO2S2 (B1)
(O2 sensor circuit high voltage bank 1 sen-
sor 2)

A

An excessively high voltage from the sensor is sent to ECM.

B

The minimum voltage from the sensor is not reached to the specified 
voltage.

P0138 HO2S2

EC-635

< DTC/CIRCUIT DIAGNOSIS >

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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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

1.

Start engine and warm it up to 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 2 minutes.

5.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-636, "Diagnosis Procedure"

.

NO-1

>> With CONSULT: GO TO 3.

NO-2

>> Without CONSULT: GO TO 5.

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

°

C (32 to 86

°

F).

1.

Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2.

Start engine and warm it up to 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.

Make sure that “COOLAN TEMP/S” indication is more than 70

°

C (158

°

F).

If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70

°

C (158

°

F).

7.

Open engine hood.

8.

Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT.

9.

Follow the instruction of CONSULT.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.

10. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT

OK

>> INSPECTION END

NG

>> Proceed to 

EC-636, "Diagnosis Procedure"

.

CAN NOT BE DIAGNOSED>>GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN

1.

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

2.

Perform DTC confirmation procedure again.

>> GO TO 3.

5.

PERFORM COMPONENT FUNCTION CHECK-1

Without CONSULT

1.

Start engine and warm it up to 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 and ground as per the following condition.

EC-636

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0138 HO2S2

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 6.

6.

PERFORM COMPONENT FUNCTION CHECK-2

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 7.

7.

PERFORM COMPONENT FUNCTION CHECK-3

Check the voltage between ECM harness connector and ground as per the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-636, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010986344

1.

INSPECTION START

Confirm the detected malfunction (A or B). Refer to 

EC-634, "DTC Description"

.

Which malfunction is detected?

A

>> GO  TO  2.

B

>> GO  TO  7.

2.

CHECK HO2S2 CONNECTOR FOR WATER

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Check connectors for water.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK HO2S2 GROUND CIRCUIT

ECM

Condition

Voltage

Connector

+

−

Terminal

F85

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Revving up to 4,000 rpm under no 
load at least 10 times

The voltage should be above 0.73 V 
at least once during this procedure.

ECM

Condition

Voltage

Connector

+

−

Terminal

F85

22

23

Keeping engine speed at idle for 10 
minutes

The voltage should be above 0.73 V 
at least once during this procedure.

ECM

Condition

Voltage

Connector

+

−

Terminal

F85

22

23

Coasting from 80 km/h (50 MPH) in 
D position

The voltage should be above 0.73 V 
at least once during this procedure.

Water should not exist.