Nissan Quest E52. Manual - part 503

EC-222

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0138, P0158 HO2S2

P0138, P0158 HO2S2

DTC Logic

INFOID:0000000009651077

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 (manifold) 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

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.

PBIB1848E

PBIB2376E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0138

Heated oxygen sensor 2 
(bank 1) circuit high volt-
age

A)

An excessively high voltage from the sen-
sor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2

B)

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

P0158

Heated oxygen sensor 2 
(bank 2) circuit high volt-
age

A)

An excessively high voltage from the sen-
sor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 2

B)

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, P0158 HO2S2

EC-223

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> 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.

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 2 minutes.

7.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-225, "Diagnosis Procedure"

.

NO-1

>> With CONSULT: GO TO 3.

NO-2

>> Without CONSULT: 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.

Select “DATA MONITOR” mode with CONSULT.

2.

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

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Turn ignition switch OFF and wait at least 10 seconds.

6.

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

7.

Let engine idle for 1 minute.

8.

Check 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).

9.

Open engine hood.

10. Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in

“DTC WORK SUPPORT” mode with CONSULT.

11. Follow the instruction of CONSULT display.

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

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

OK

>> INSPECTION END

NG

>> Proceed to 

EC-225, "Diagnosis Procedure"

.

CON NOT BE DIAGNOSED>>GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION 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-223, "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

NO

>> Proceed to 

EC-225, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000009651078

1.

PERFORM COMPONENT FUNCTION CHECK-I

EC-224

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0138, P0158 HO2S2

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 conditions.

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 terminals under the following conditions.

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 terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-225, "Diagnosis Procedure"

.

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0138

F8

57

[HO2S2 (bank 1) 

signal]

59

(Sensor 
ground)

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

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

P0158

58

[HO2S2 (bank 2) 

signal]

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0138

F8

57

[HO2S2 (bank 1) 

signal]

59

(Sensor 
ground)

Keeping engine speed at idle for 10 
minutes

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

P0158

58

[HO2S2 (bank 2) 

signal]

DTC

ECM

Condition

Voltage

Connec-

tor

+

–

Terminal

Terminal

P0138

F8

57

[HO2S2 (bank 1) 

signal]

59

(Sensor 
ground)

Coasting from 80 km/h (50 MPH) 
with selector lever in the D position

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

P0158

58

[HO2S2 (bank 2) 

signal]

P0138, P0158 HO2S2

EC-225

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Diagnosis Procedure

INFOID:0000000009651079

1.

INSPECTION START

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

EC-222, "DTC Logic"

.

Which malfunction is detected?

A

>> GO TO 2.

B

>> GO TO 6.

2.

CHECK HO2S2 CONNECTOR FOR WATER

1.

Disconnect heated oxygen sensor 2 harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

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 heated oxygen sensor 2 (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, 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 and ground, or ECM harness connector and
ground.

3.

Also check harness for short to power.

Is the inspection result normal?

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F72

1

F8

59

Existed

P0158

2

F73

1

DTC

HO2S2

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0138

1

F72

4

F8

57

Existed

P0158

2

F73

4

58

DTC

HO2S2

Ground

Continuity

Bank

Connector

Terminal

P0138

1

F72

4

Ground

Not existed

P0158

2

F73

4

DTC

ECM

Ground

Continuity

Connector

Terminal

P0138

F8

57

Ground

Not existed

P0158

58