Nissan Pathfinder. Manual - part 469

EC-182

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0011, P0021 IVT CONTROL

YES

>> INSPECTION END

NO

>> Replace malfunctioning intake valve timing control solenoid valve. Refer to 

EM-52, "Intake Valve

Timing Control Solenoid Valve (LH)"

, 

EM-53, "Intake Valve Timing Control Solenoid Valve (RH)"

.

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-183

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

DTC Logic

INFOID:0000000009178106

DTC DETECTION LOGIC

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.

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

1. Start engine and let it idle for at least 10 seconds.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-183, "Diagnosis Procedure"

.

NG

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178107

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

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

2. Turn ignition switch ON.

3. Check the voltage between A/F sensor 1 harness connector and ground.

Is the inspection result normal?

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0031

A/F SEN1 HTR (B1)
(HO2S heater control circuit 
low bank 1 sensor 1)

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
open or shorted.)

• A/F sensor 1 heater

P0032

A/F SEN1 HTR (B1)
(HO2S heater control circuit 
high bank 1 sensor 1)

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the A/F sensor 1 heater.) 

• Harness or connectors

(The A/F sensor 1 heater circuit is 
shorted.)

• A/F sensor 1 heater

P0051

A/F SEN1 HTR (B2)
(HO2S heater control circuit 
low bank 2 sensor 1)

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
open or shorted.)

• A/F sensor 1 heater

P0052

A/F SEN1 HTR (B2)
(HO2S heater control circuit 
high bank 2 sensor 1)

The current amperage in the A/F sensor 1 heater 
circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the A/F sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
shorted.)

• A/F sensor 1 heater

DTC

A/F sensor 1

Ground

Voltage

Bank

Connector

Terminal

P0031, P0032

1

F5

4

Ground

Battery voltage

P0051, P0052

2

F65

4

EC-184

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness 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 4.

NO

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

4.

CHECK A/F SENSOR 1 HEATER

Check A/F sensor 1 heater. Refer to 

EC-184, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

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

EM-31, "Removal and Installation

(bank 2)"

, 

EM-33, "Removal and Installation (bank 1)"

.

Component Inspection

INFOID:0000000009178108

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.

DTC

A/F sensor 1

IPDM E/R 

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0031, P0032

1

F5

4

F19

52

Existed

P0051, P0052

2

F65

4

53

DTC

A/F sensor 1

ECM 

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0031, P0032

1

F5

3

F51

6

Existed

P0051, P0052

2

F65

3

3

+

−

Resistance

A/F sensor 1

Terminal

3

4

1.8 - 2.44 

Ω [at 25°C (77°F)]

1

∞ Ω

(Continuity should not exist)

2

4

1

2

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-185

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

EM-31, "Removal and Installation

(bank 2)"

, 

EM-33, "Removal and Installation (bank 1)"

.