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Nissan Altima L32. Manual - part 277

P0139 HO2S2

EC-229

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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

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. Open engine hood.

7. Select “HO2S2 (B1) P0139” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.

8. Follow the instruction of CONSULT-III.

NOTE:

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

9. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III?

>> INSPECTION END

>> GO TO 4.

CAN NOT BE DIAGNOSED>>GO TO 4.

PERFORM THE RESULT OF DTC CONFIRMATION PROCEDURE

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.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-229, "Component Function Check"

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.
Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-230, "Diagnosis Procedure"

Component Function Check

INFOID:0000000004349274

PERFORM COMPONENT FUNCTION CHECK-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

>> GO TO 2.

PERFORM COMPONENT FUNCTION CHECK-II

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S2

signal)

Ground

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

The voltage should be
above 0.30 V at least once
during this procedure.

JMBIA1586ZZ

EC-230

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0139 HO2S2

Check the voltage between ECM harness connector and ground

under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector and ground

under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-230, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004349275

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace ground connection.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

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

EC-32, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

2. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171 or P0172. Refer to

EC-254, "DTC Logic"

EC-258,

"DTC Logic"

>> GO TO 3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect heated oxygen sensor 2 harness connector.

3. Disconnect ECM 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?

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S2

signal)

Ground

Keeping engine
speed at idle for
10 minutes

The voltage should be
above 0.30 V at least once
during this procedure.

JMBIA1587ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S2

signal)

Ground

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

The voltage should
be above 0.30 V at
least once during this
procedure.

JMBIA1588ZZ

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

F13

Existed

P0139 HO2S2

EC-231

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

YES

>> GO TO 4.

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

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 5.

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

CHECK HEATED OXYGEN SENSOR 2

Refer to

EC-231, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 7.

>> GO TO 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 J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000004349276

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

>> GO TO 3.

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.

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

F13

Existed

HO2S2

ECM

Ground

Continuity

Connector Terminal Connector Terminal

F42

F13

Ground Not existed

EC-232

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0139 HO2S2

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 0.18V at least once when the “FUEL INJECTION” is

−25%.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

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

>> GO TO 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

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

PBIB3458E

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S2

signal)

Ground

Revving up to
4,000 rpm un-
der no load at
least 10 times

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

JMBIA1586ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S2

signal)

Ground

Keeping engine
speed at idle for
10 minutes

The voltage should be
above 0.68 V at least once
during this procedure.
The voltage should be be-
low 0.18 V at least once
during this procedure.

JMBIA1587ZZ

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