Nissan Murano. Manual - part 573

EC-402

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1805 BRAKE SWITCH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch. Refer to 

BR-20, "Exploded View"

.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

P2096, P2097, P2098, P2099 A/F SENSOR 1

EC-403

< DTC/CIRCUIT DIAGNOSIS >

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P2096, P2097, P2098, P2099 A/F SENSOR 1

Description

INFOID:0000000009720152

The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of approxi-
mately 800

°

C (1,472

°

F).

DTC Logic

INFOID:0000000009720153

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:

JMBIA0112GB

PBIB3354E

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible Cause

P2096

POST CAT FUEL TRIM SYS 
B1
(Post catalyst fuel trim system 
too lean bank 1)

The output voltage computed by ECM from the A/
F sensor 1 signal is shifts to the lean side for a 
specified period.

• A/F sensor 1 (bank 1)
• A/F sensor 1 heater
• Heated oxygen sensor 2 (bank 1)
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks

P2097

POST CAT FUEL TRIM SYS 
B1
(Post catalyst fuel trim system 
too rich bank 1)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is shifts to the rich side for a spec-
ified period.

P2098

POST CAT FUEL TRIM SYS 
B2
(Post catalyst fuel trim system 
too lean bank 2)

The output voltage computed by ECM from the A/
F sensor 1 signal is shifts to the lean side for a 
specified period.

• A/F sensor 1 (bank 2)
• A/F sensor 1 heater
• Heated oxygen sensor 2 (bank 2)
• Fuel pressure
• Fuel injector
• Intake air leaks
• Exhaust gas leaks

P2099

POST CAT FUEL TRIM SYS 
B2
(Post catalyst fuel trim system 
too rich bank 2)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is shifts to the rich side for a spec-
ified period.

EC-404

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P2096, P2097, P2098, P2099 A/F SENSOR 1

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.

Clear the mixture ratio self-learning value. Refer to 

EC-22, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

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 1 minute under no load.

6.

Let engine idle for 1 minute.

7.

Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.

8.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-404, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009720154

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E38. Refer to Ground Inspection in 

GI-47, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

RETIGHTEN A/F SENSOR 1 AND HEATED OXYGEN SENSOR 2

Loosen and retighten the A/F sensor 1 and heated oxygen senosr 2. Refer to 

EM-38, "Exploded View"

.

>> GO TO 3.

3.

CHECK FOR EXHAUST GAS LEAK

1.

Start engine and run it at idle.

2.

Listen for an exhaust gas leak before the three way catalyst 2.

Is exhaust gas leak detected?

YES

>> Repair or replace.

NO

>> GO TO 4.

4.

CHECK FOR INTAKE AIR LEAKAGE

1.

Start engine and run it at idle.

2.

Listen for an intake air leakage after the mass air flow sensor.

Is intake air leakage detected?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning part.

5.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1.

Clear the mixture ratio self-learning value. Refer to 

EC-22, "MIXTURE RATIO SELF-LEARNING VALUE

CLEAR : Special Repair Requirement"

.

2.

Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to 

EC-240, "DTC Logic"

or 

EC-244, "DTC Logic"

.

NO

>> GO TO 6.

6.

CHECK HARNESS CONNECTOR

1.

Turn ignition switch OFF.

P2096, P2097, P2098, P2099 A/F SENSOR 1

EC-405

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2.

Disconnect A/F sensor 1 harness connector.

3.

Check harness connector for water.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness connector.

7.

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

1.

Disconnect 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?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.
• IPDM E/R harness connector F12
• 15 A fuse (No. 46)
• Harness for open or short between A/F sensor 1 and IPDM E/R

>> Repair or replace harness or connectors.

9.

CHECK A/F SENSOR 1 INPUT 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.

Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.

Water should not exit.

DTC

A/F sensor

Ground

Voltage (V)

Bank

Connector

Terminal

P2096
P2097

1

F27

4

Ground

Battery voltage

P2098
P2099

2

F64

4

DTC

A/F sensor 1

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P2096
P2097

1

F27

1

F8

45

Existed

2

49

P2098
P2099

2

F64

1

53

2

57

DTC

A/F sensor 1

Ground

Continuity

Bank

Connector

Terminal

P2096
P2097

1

F27

1

Ground

Not existed

2

P2098
P2099

2

F64

1

2