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Nissan Note E12. Manual - part 212

P0137 HO2S2

EC-187

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 4.

CHECK HEATED OXYGEN SENSOR 2-II

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

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

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

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace malfunctioning heated oxygen sensor 2. Refer to

EX-5, "Exploded View"

ECM

Condition

Voltage

Connector

–

Terminal

F11

(HO2S2)

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

The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.

ECM

Condition

Voltage

Connector

–

Terminal

F11

(HO2S2)

Keeping engine at idle for 10 minutes

The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.

ECM

Condition

Voltage

Connector

–

Terminal

F11

(HO2S2)

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

The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.

EC-188

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

P0138 HO2S2

P0138 HO2S2

DTC Logic

INFOID:0000000009022545

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 1 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 various driving condi-

tions 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 var-

ious driving conditions such as fuel cut.

DTC CONFIRMATION PROCEDURE

PRECONDITIONING OF DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

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.

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.

PBIB1848E

JSBIA3141GB

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0138

Heated oxygen sensor 2
circuit high voltage

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

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2

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

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector

P0138 HO2S2

EC-189

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

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

EC-191, "Diagnosis Procedure"

NO-1 >> With CONSULT: GO TO 3.

NO-2 >> Without CONSULT: GO TO 12.

PRECONDITIONING OF DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

“COMPLETED” will appear on CONSULT screen when all tests “COND1”, “COND2” and “COND3” are com-

pleted.

TESTING CONDITION:

• For the best results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

°C (32 to 86 °F).

• Never stop engine during this procedure. If the engine is stopped, retry procedure from PERFORM

PROCEDURE FOR COND1-II.

>> GO TO 4.

PERFORM PROCEDURE FOR COND1-I

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

>> GO TO 5.

PERFORM PROCEDURE FOR COND1-II

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 6.

PERFORM PROCEDURE FOR COND1-III

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

2. Let engine idle for 1 minute.

3. Select “ENGINE” using CONSULT.

4. Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode.

5. Touch “START”.

6. Let engine idle for at least 30 seconds.

7. Rev engine up to 2,000 rpm two or three times quickly under no load.
Is “COMPLETED” appears on CONSULT screen?

YES

>> GO TO 8.

>> GO TO 7.

PERFORM PROCEDURE FOR COND1-IV

When the following conditions are met, “TESTING” will be displayed at “COND1” on the CONSULT screen.

Maintain the conditions continuously until “TESTING” changes to “COMPLETED”

CAUTION:

Always drive vehicle at a safe speed.
Which displayed on CONSULT screen?

“COND1: OUT OF CONDITION”>>GO TO 5.

“COND1: COMPLETED”, “COND2: INCOMPLETE”>>GO TO 8.

“COND1: COMPLETED”, “COND2: COMPLETED”>>GO TO 9.

PERFORM PROCEDURE FOR COND2

ENG SPEED

More than 1,000 rpm

B/FUEL SCHDL

More than 1.0 msec

COOLAN TEMP/S

70 - 105

°C

Selector lever

Suitable position

EC-190

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

P0138 HO2S2

While driving, release accelerator pedal completed from the above condition (PERFORM PROCEDURE FOR

COND1-III) until “INCOMPLETE” at “COND2” on CONSULT screen has turned to “COMPLETED” (It will take

approximately 4 seconds).

CAUTION:

Always drive vehicle at a safe speed.
Which displayed on CONSULT screen?

“COND2: COMPLETED”, “COND3: INCOMPLETE”>>GO TO 9.

“COND2: COMPLETED”, “COND3: COMPLETED”>>GO TO 10.

PERFORM PROCEDURE FOR COND3-I

Stop vehicle and let it idle until “INCOMPLETE” of “COND3” on CONSULT screen has turned to “COM-

PLETED”

>> GO TO 10.

10.

PERFORM PROCEDURE FOR COND3-II

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

“OK”

>> INSPECTION END.

“NG”

>> Proceed to

EC-191, "Diagnosis Procedure"

“CAN NOT BE DIAGNOSED”>>GO TO 11.

11.

PERFORM PROCEDURE FOR COND3-III

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

2. Turn ignition switch ON and select ENGINE using CONSULT.

3. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT

4. Start engine and warm it up while monitoring “COOLAN TEMP/S” indication on CONSULT.

5. When “COOLAN TEMP/S” indication reaches 70

°C (158°F).

>> GO TO 6.

12.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-190, "Component Function Check"

NOTE:

Use component function 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.

>> Proceed to

EC-191, "Diagnosis Procedure"

Component Function Check

INFOID:0000000009022546

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT

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

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

4. Turn ignition switch OFF and wait at least 10 seconds.

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

6. Let engine idle for 1 minute.

7. Check the voltage between ECM harness connector terminals under the following condition.

ECM

Condition

Voltage

Connector

–

Terminal

F11

(HO2S2 signal)

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

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

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