Nissan Altima L32. Manual - part 275

P0138 HO2S2

EC-221

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM 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. Start 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

>> Go to 

EC-222, "Diagnosis Procedure"

.

NO-1 >> With CONSULT-III: GO TO 3.

NO-2 >> Without CONSULT-III: 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 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. Make sure 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 to 70

°C (158°F).

7. Open engine hood.

8. Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.

9. Follow the instruction of CONSULT-III.

NOTE:

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

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

OK

>> INSPECTION END

NG

>> Go to 

EC-222, "Diagnosis Procedure"

.

CAN NOT BE DIAGNOSED>>GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALUNCTION 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 FOR MALFUNCTION B

Perform component function check. Refer to 

EC-222, "Diagnosis Procedure"

.

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

NO

>> Go to 

EC-222, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004349269

1.

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT-III

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

EC-222

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0138 HO2S2

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 2.

2.

PERFORM COMPONENT FUNCTION CHECK-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 3.

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

NO

>> Go to 

EC-222, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349270

1.

INSPECTION START

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

EC-220, "DTC Logic"

.

Which malfunction is detected?

A

>> GO  TO  2.

B

>> GO  TO  9.

2.

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?

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

33

(HO2S2 

signal)

Ground

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

The voltage should be 
above 0.18 V at least 
once during this proce-
dure.

JMBIA1586ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

33

(HO2S2 

signal)

Ground

Keeping engine 
speed at idle for 
10 minutes

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

JMBIA1587ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

33

(HO2S2 

signal)

Ground

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

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

JMBIA1588ZZ

P0138 HO2S2

EC-223

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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YES

>> GO TO 3.

NO

>> Repair or replace ground connection.

3.

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

>> 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 5.

NO

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

5.

CHECK HO2S2 CONNECTOR FOR WATER

Check connectors for water.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness or connectors.

6.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-225, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

CAUTION:

• 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 J-43897-12)] and approved anti-seize lubricant (commercial

service tool).

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

1

F13

35

Existed

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

4

F13

33

Existed

HO2S2

ECM

Ground

Continuity

Connector Terminal Connector Terminal

F42

4

F13

33

Ground Not existed

Water should not exist.

EC-224

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0138 HO2S2

>> INSPECTION END

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

9.

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 10.

NO

>> Repair or replace ground connection.

10.

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 P0172 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0172. Refer to 

EC-258, "DTC Logic"

.

NO

>> GO TO 11.

11.

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?

YES

>> GO TO 12.

NO

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

12.

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 13.

NO

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

13.

CHECK HEATED OXYGEN SENSOR 2

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

1

F13

35

Existed

HO2S2

ECM

Continuity

Connector Terminal Connector Terminal

F42

4

F13

33

Existed

HO2S2

ECM

Ground

Continuity

Connector Terminal Connector Terminal

F42

4

F13

33

Ground Not existed