Nissan Qashqai (2007-2010). Manual — part 239

P0138 HO2S2

EC-475

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

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1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E21. Refer to Ground Inspection in

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Disconnect heated oxygen sensor 2 harness connector.

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

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F121, E7
• Harness for open or short between HO2S2 and ECM

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

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 or ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F121, E7
• Harness for open or short between HO2S2 and ECM

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

6.

CHECK HO2S2 CONNECTOR FOR WATER

Check connectors for water.

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

E58

1

F8

59

Existed

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

E58

4

F8

50

Existed

HO2S2

ECM

Ground

Continuity

Connector

Terminal

Connector

Terminal

E58

4

F8

50

Ground

Not existed

EC-476

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

P0138 HO2S2

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness or connectors.

7.

CHECK HEATED OXYGEN SENSOR 2

Refer to

EC-477, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

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 using Oxygen Sensor Thread

Cleaner tool and approved anti-seize lubricant.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001096825

1.

INSPECTION START

Do you have CONSULT-III?

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT-III

1.

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

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)” as the monitor item with
CONSULT-III.

7.

Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to

±

25%.

“HO2S2 (B1)” should be above 0.68V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.50V at least once when the “FUEL INJECTION” is

−

25%.

Water should not exist.

PBIB0551E

P0138 HO2S2

EC-477

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

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Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 6.

3.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT-III

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 and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

CHECK HEATED OXYGEN SENSOR 2-II

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 5.

5.

CHECK HEATED OXYGEN SENSOR 2-III

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 6.

6.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

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 using Oxygen Sensor Thread

Cleaner tool and approved anti-seize lubricant.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

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

The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.50V at least
once during this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

Keeping engine speed at idle for 10 min-
utes

The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.50V at least
once during this procedure.

ECM

Ground

Condition

Voltage

Connector

Terminal

F8

50

(HO2S2 signal)

Ground

Coasting from 80 km/h (50 MPH) in 4th
gear position

The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.50V at least
once during this procedure.

EC-478

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

P0138 HO2S2

>> INSPECTION END