Nissan X-Trail 32. Manual - part 866

P0031, P0032 A/F SENSOR 1 HEATER

EC-593

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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F

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EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

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 to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK A/F SENSOR 1 HEATER

Check the A/F sensor 1 heater. Refer to 

EC-593, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to 

EM-180, "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 using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved Anti-seize Lubricant
(commercial service tool).

>> INSPECTION END

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010986311

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1

1.

Turn ignition switch OFF.

2.

Disconnect A/F sensor 1 harness connector.

3.

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

+

−

Voltage

A/F sensor 1

Connector

Terminal

F27

4

Ground

Battery voltage

+

−

Continuity

A/F sensor 1

ECM

Connector

Terminal

Connector

Terminal

F27

3

F68

53

Existed

EC-594

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0031, P0032 A/F SENSOR 1 HEATER

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1. Refer to 

EM-180, "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

A/F sensor 1

Resistance

+

−

Terminal

3

4

1.8 - 2.44 

Ω

 [at 20

°

C (68

°

F)]

1

∞

 

Ω

(Continuity should not exist)

2

4

1

2

P0037, P0038 HO2S2 HEATER

EC-595

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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P0037, P0038 HO2S2 HEATER

DTC Description

INFOID:0000000010986312

DTC DETECTION LOGIC

POSSIBLE CAUSE

DTC P0037

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

DTC P0038

• Harness or connectors (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 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.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT.

2.

Start engine and warm it up to 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.

Check 1st trip DTC.

 With GST

Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-595, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010986313

1.

CHECK HO2S2 POWER SUPPLY CIRCUIT

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0037

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

The current amperage in the heated oxygen sensor 2 heater circuit is out 
of the normal range.
(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) 

The current amperage in the heated oxygen sensor 2 heater circuit is out 
of the normal range.
(An excessively high voltage signal is sent to ECM through the heated ox-
ygen sensor 2 heater.)

EC-596

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0037, P0038 HO2S2 HEATER

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.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT

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 to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK HEATED OXYGEN SENSOR 2 HEATER

Check the heated oxygen sensor 2 heater. Refer to 

EC-596, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2. Refer to 

EX-12, "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

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000010986314

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 per the following.

+

−

Voltage

HO2S2

Connector

Terminal

F31

4

Ground

Battery voltage

+

−

Continuity

HO2S2

ECM

Connector

Terminal

Connector

Terminal

F31

3

F68

54

Existed