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Nissan Cube. Manual - part 326

EC-190

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0137 HO2S2

P0137 HO2S2

Description

INFOID:0000000009947316

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

DTC Logic

INFOID:0000000009947317

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 oxy-
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during the various driving condition such as fuel-
cut.

DTC CONFIRMATION PROCEDURE

INSPECTION START

Do you have CONSULT?
Do you have CONSULT?

YES

>> GO TO 2.

>> GO TO 5.

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.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

C (32 to 86

F).

>> GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

SEF327R

SEF259VA

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0137

Heated oxygen sensor 2
circuit low voltage

The maximum 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
• Intake air leaks

P0137 HO2S2

EC-191

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

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

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

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

Let engine idle for 1 minute.

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 70

C (158

F).

Open engine hood.

Select “HO2S2 (B1) P1147” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT.

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

10. Touch “SELF-DIAG RESULT”.

Which is displayed on CONSULT screen?

>> INSPECTION END

>> Go to

EC-192, "Diagnosis Procedure"

CAN NOT BE DIAGNOSED>>GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

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

Perform DTC CONFIRMATION PROCEDURE again.

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-191, "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-192, "Diagnosis Procedure"

Component Function Check

INFOID:0000000009947318

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

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

Let engine idle for 1 minute.

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

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

ECM

Ground

Condition

Voltage

Connector

Terminal

(HO2S2 signal)

Ground

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

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

EC-192

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

P0137 HO2S2

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-192, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000009947319

CHECK GROUND CONNECTION

Turn ignition switch OFF.

Check ground connection E38. Refer to

GI-43, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace ground connection.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

Clear the mixture ratio self-learning value. Refer to

EC-22, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171. Refer to

EC-215, "DTC Logic"

>> GO TO 3.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

Disconnect ECM harness connector.

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

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

Is the inspection result normal?

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

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

ECM

Ground

Condition

Voltage

Connector

Terminal

(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.

ECM

Ground

Condition

Voltage

Connector

Terminal

(HO2S2 signal)

Ground

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

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

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F30

Existed

P0137 HO2S2

EC-193

< DTC/CIRCUIT DIAGNOSIS >

[MR18DE]

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

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-193, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 7.

>> GO TO 6.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2. Refer to

EX-5, "Exploded View"

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 J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to

GI-40, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000009947320

INSPECTION START

Do you have CONSULT?
Do you have CONSULT?

YES

>> GO TO 2.

>> GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT

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

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F30

Existed

HO2S2

Ground

Continuity

Connector

Terminal

F30

Ground

Not existed

ECM

Ground

Continuity

Connector

Terminal

Ground

Not existed

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