Nissan Qashqai J11. Manual - part 297

P0031, P0032 A/F SENSOR 1 HEATER

ECM-165

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning part.

2.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between A/F sensor 1 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 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK A/F SENSOR 1 HEATER

Refer to 

ECM-165, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

REPLACE A/F SENSOR 1

Replace malfunctioning A/F sensor 1. Refer to 

EM-153, "Exploded View"

.

CAUTION:

• Discard any A/F 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 A/F sensor, clean exhaust system threads.

>> INSPECTION END

Component Inspection

INFOID:0000000010702893

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

1.

Turn ignition switch OFF.

2.

Disconnect air fuel ratio (A/F) sensor 1 harness connector.

3.

Check resistance between A/F sensor 1 terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE A/F SENSOR 1

+

−

Continuity

A/F sensor 1

ECM

Connector Terminal

Connector Terminal

F74

3

F16

93

Existed

A/F sensor 1

Resistance

+

−

Terminal

3

4

1.80 - 2.44 

Ω

 [at 25

°

C 

(77

°

F)]

1

Not exist

2

4

1

2

ECM-166

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0031, P0032 A/F SENSOR 1 HEATER

Replace malfunctioning A/F sensor 1. Refer to 

EM-153, "Exploded View"

.

CAUTION:

• Discard any A/F 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 A/F sensor, clean exhaust system threads.

>> INSPECTION END

P0037, P0038 HO2S2 HEATER

ECM-167

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

P0037, P0038 HO2S2 HEATER

DTC Description

INFOID:0000000010702894

DTC DETECTION LOGIC

POSSIBLE CAUSE

P0037

• Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)
• Heated oxygen sensor 2 heater

P0038

• Harness or connectors (The heated oxygen sensor 2 heater circuit is shorted.)
• Heated oxygen sensor 2 heater

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 11 to 16 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

ECM-167, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010702895

1.

CHECK HEATED OXYGEN SENSOR 2 (HO2S2) POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between HO2S2 harness connector and ground.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0037

HO2S2 HTR (B1)
(HO2S heater control circuit low bank 1 
sensor 2)

An excessively low voltage signal is sent to ECM through the heated oxy-
gen sensor 2 heater.

P0038

HO2S2 HTR (B1)
(HO2S heater control circuit high bank 1 
sensor 2)

An excessively high voltage signal is sent to ECM through the heated oxy-
gen sensor 2 heater.

ECM-168

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0037, P0038 HO2S2 HEATER

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning part.

2.

CHECK HO2S2 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

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 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK HO2S2 HEATER

Refer to 

ECM-168, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to 

EX-11, "Exploded View"

.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m

(19.7in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads.

>> INSPECTION END

Component Inspection

INFOID:0000000010702896

1.

CHECK HEATED OXYGEN SENSOR 2 HEATER

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

3.

Check resistance between HO2S2 terminals as follows.

+

Ground

Voltage

HO2S2

Connector Terminal

F35

4

Ground

Battery voltage

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F35

3

F16

89

Existed

HO2S2

Resistance

+

−

Terminal

4

3

3.4 - 4.4 

Ω

 [at 25

°

C 

(77

°

F)]