Nissan Qashqai J11. Manual - part 309

P0138 HO2S2

ECM-213

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

>> GO TO 2.

2.

DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

1.

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

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

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

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

ECM-214, "Diagnosis Procedure"

.

NO-1

>> With CONSULT: GO TO 3.

NO-2

>> Without CONSULT: GO TO 5.

3.

DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-1

WITH CONSULT

Test condition: 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 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.

Restart 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.

Check that “COOLAN TEMP/S” indicates 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 “O2 (B1) P0138” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT.

9.

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

10. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT screen?

OK-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

OK-2

>> Confirmation after repair: INSPECTION END

NG

>> Proceed to 

ECM-214, "Diagnosis Procedure"

.

CAN NOT BE DIAGNOSED>>GO TO 4.

4.

DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-2

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

NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
1.

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

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Restart 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-214

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0138 HO2S2

Is the inspection result normal?

YES-1 >> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

YES-2 >> Confirmation after repair: INSPECTION END
NO

>> GO TO 6.

6.

PERFORM COMPONENT FUNCTION CHECK-2

WITHOUT CONSULT

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

Is the inspection result normal?

YES-1 >> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

YES-2 >> Confirmation after repair: INSPECTION END
NO

>> GO TO 7.

7.

PERFORM COMPONENT FUNCTION CHECK-3

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

CAUTION:

Always drive vehicle at a safe speed.

Is the inspection result normal?

YES-1 >> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

YES-2 >> Confirmation after repair: INSPECTION END
NO

>> Proceed to 

ECM-208, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010702931

1.

INSPECTION START

1.

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

ECM-212, "DTC Description"

.

Which malfunction is detected?

A

>> GO  TO  2.

B

>> GO  TO  7.

2.

CHECK HEATED OXYGEN SENSOR 2 CONNECTOR

ECM

Condition

Voltage

Connector

+

–

Terminal

F16

57

59

Revving up to 4,000 rpm quickly under no load 
at least 10 times. (Depress and release the ac-
celerator pedal as quickly as possible.)

The voltage should be above 0.77 V at 
least once during this procedure.
The voltage should be below 0.18 V at 
least once during this procedure.

ECM

Condition

Voltage

Connector

+

–

Terminal

F16

57

59

Keeping engine at idle for 10 minutes.

The voltage should be above 0.77 V at 
least once during this procedure.
The voltage should be below 0.18 V at 
least once during this procedure.

ECM

Condition

Voltage

Connector

+

–

Terminal

F16

57

59

Coasting from 80 km/h (50 MPH) with selector 
lever in the D position (CVT), 4th gear position 
(M/T).

The voltage should be above 0.77 V at 
least once during this procedure.
The voltage should be below 0.18 V at 
least once during this procedure.

P0138 HO2S2

ECM-215

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

1.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

4.

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

5.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning part.

4.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

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

2.

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

3.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning part.

5.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

ECM-217, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

There is no leakage.

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F35

1

F16

59

Existed

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F35

2

F16

57

Existed

+

Ground

Continuity

HO2S2

Connector

Terminal

F35

2

Ground

Not existed

+

Ground

Continuity

ECM

Connector

Terminal

F16

57

Ground

Not existed

ECM-216

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0138 HO2S2

NO

>> GO TO 6.

6.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to 

EX-11, "Exploded View"

.

CAUTION:

• Discard any heated oxygen 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 oxygen sensor, clean exhaust system threads.

>> INSPECTION END

7.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1.

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

2.

Clear the mixture ratio self-learning value. Refer to 

ECM-131, "Work Procedure"

.

3.

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0172 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0172. Refer to 

ECM-231, "Diagnosis Procedure"

.

NO

>> GO TO 8.

8.

CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

4.

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

5.

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

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace malfunctioning part.

9.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

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

2.

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

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F35

1

F16

59

Existed

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F35

2

F16

57

Existed

+

Ground

Continuity

HO2S2

Connector

Terminal

F35

2

Ground

Not existed