Nissan Pathfinder (2012 year). Manual - part 354

P2A00, P2A03 A/F SENSOR 1

EC-913

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Refer to 

EM-169, "Removal and Installation"

.

>> 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.
OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace.

5.

CLEAR THE SELF-LEARNING DATA

 

With CONSULT

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

2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

3. Clear the self-learning control coefficient by touching “CLEAR”.

4. 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?

 

Without CONSULT

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

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor (1) harness connector.
-

: Vehicle front

4. Restart engine and let it idle for at least 5 seconds.

5. Stop engine and reconnect mass air flow sensor harness con-

nector.

6. Check that DTC P0102 is displayed.

7. Erase the DTC memory.

8. Check that DTC P0000 is displayed.

9. 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 or No

Yes

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

EC-716, "Diagnosis

Procedure"

 or 

EC-720, "Diagnosis Procedure"

.

No

>> GO TO 6.

6.

CHECK HARNESS CONNECTOR

1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

ALBIA0353ZZ

August 2012

2012 Pathfinder

EC-914

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P2A00, P2A03 A/F SENSOR 1

3. Check harness connector for water. 

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace harness connector.

7.

CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between A/F sensor 1 terminal 4 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• IPDM E/R harness connector E119

• 15 A fuse (No. 54)

• 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 harness continuity between A/F sensor 1 terminals and ECM terminals as per the following.

Refer to Wiring Diagram.

ALBIA0360ZZ

1.

A/F sensor 1 (bank 2) harness connector

2.

A/F sensor 1 (bank 2)

3.

A/F sensor 1 (bank 1)

4.

A/F sensor 1 (bank 1) harness connector
: Vehicle front

Water should not exit.

Voltage: Battery voltage

PBIB3308E

A/F sensor 1 terminal

ECM terminal

Bank1

1

35

2

56

Bank 2

1

16

2

75

August 2012

2012 Pathfinder

P2A00, P2A03 A/F SENSOR 1

EC-915

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4. Check harness continuity between the following terminals and ground.

Refer to Wiring Diagram.

5. Also check harness for short to power.
OK or NG

OK

>> GO TO 10.

NG

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

10.

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-635, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 13.

11.

CHECK HEATED OXYGEN SENSOR 2

Check heated oxygen sensor 2. Refer to 

EC-711, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace malfunctioning heated oxygen sensor 2.

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

OK or NG

OK

>> GO TO 13.

NG

>> Repair or replace.

13.

REPLACE A/F SENSOR 1

Replace malfunctioning A/F sensor 1.  Refer to 

EM-169

.

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).

>> GO TO 14.

14.

CONFIRM A/F ADJUSTMENT DATA

1. Turn ignition switch OFF and then ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Make sure that “0.000” is displayed on CONSULT screen.
OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 15.

15.

CLEAR THE SELF-LEARNING DATA

 

With CONSULT

Continuity should exist.

Bank 1

Bank 2

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

ECM terminal

1

35

1

16

2

56

2

75

Continuity should not exist.

August 2012

2012 Pathfinder

EC-916

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P2A00, P2A03 A/F SENSOR 1

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

2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

3. Clear the self-learning control coefficient by touching “CLEAR”.

 

Without CONSULT

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

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor (1) harness connector.
-

: Vehicle front

4. Restart engine and let it idle for at least 5 seconds.

5. Stop engine and reconnect mass air flow sensor harness con-

nector.

6. Check that DTC P0102 is displayed.

7. Erase the DTC memory.

8. Check that DTC P0000 is displayed.

>> GO TO 16.

16.

CONFIRM A/F ADJUSTMENT DATA

1. Turn ignition switch OFF and then ON.

2. Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR” mode with CONSULT.

3. Check that “0.000” is displayed on CONSULT screen.

>>

INSPECTION END

ALBIA0353ZZ

August 2012

2012 Pathfinder

ASCD BRAKE SWITCH

EC-917

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

ASCD BRAKE SWITCH

Component Description

INFOID:0000000007358833

When the brake pedal is depressed, ASCD brake switch is turned

OFF and stop lamp switch is turned ON. ECM detects the state of

the brake pedal by two kinds of input (ON/OFF signal).

Refer to 

EC-512, "System Description"

 for the ASCD function.

Diagnosis Procedure

INFOID:0000000007358834

1.

CHECK OVERALL FUNCTION-I

 With CONSULT

1. Turn ignition switch ON.

2. Select “BRAKE SW 1” in “DATA MONITOR” mode with CONSULT.

3. Check “BRAKE SW 1” indication under the following conditions.

 Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 108 and ground under the

following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ASCD brake switch harness connector.

3. Turn ignition switch ON.

BBIA0560E

CONDITION

INDICATION

Brake pedal: Fully released

ON

Brake pedal: Slightly depressed

OFF

CONDITION

VOLTAGE

Brake pedal: Fully released

Battery voltage

Brake pedal: Slightly depressed

Approximately 0 V

MBIB0061E

BBIA0560E

August 2012

2012 Pathfinder

EC-918

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ASCD BRAKE SWITCH

4. Check voltage between ASCD brake switch terminal 1 and

ground with CONSULT or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No. 12)

• Harness for open or short between ASCD brake switch and fuse

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

4.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 5.

NG

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

5.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-918, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace ASCD brake switch. Refer to 

BR-23

.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358835

ASCD BRAKE SWITCH

1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

August 2012

2012 Pathfinder

ASCD BRAKE SWITCH

EC-919

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Check harness continuity between ASCD brake switch terminals

1 and 2 under the following conditions.

If NG, adjust ASCD brake switch installation, refer to 

BR-23,

"Removal and Installation"

, and perform step 3 again.

Condition

Continuity

Brake pedal: Fully released

Should exist.

Brake pedal: Slightly depressed

Should not exist.

SEC023D

August 2012

2012 Pathfinder

EC-920

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ASCD INDICATOR

ASCD INDICATOR

Component Description

INFOID:0000000007358836

ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and

SET, and is integrated in combination meter.

CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD

system is ready for operation.

SET indicator illuminates when the following conditions are met. 

• CRUISE indicator is illuminated.

• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of the

ASCD setting.

SET indicator remains lit during ASCD control.

Refer to 

EC-512, "System Description"

 for the ASCD function.

Diagnosis Procedure

INFOID:0000000007358837

1.

CHECK OVERALL FUNCTION

Check ASCD indicator under the following conditions.

OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 2.

2.

CHECK DTC

Check that DTC U0101 or U1001 is not displayed.
OK or NG

OK

>> GO TO 3.

NG

>> Perform trouble diagnosis for DTC U0101 or U1001. Refer to 

EC-624, "DTC Confirmation Proce-

dure"

 or 

EC-625, "DTC Confirmation Procedure"

.

3.

 CHECK COMBINATION METER FUNCTION

Refer to 

MWI-27, "CONSULT Function (METER/M&A)"

.

OK or NG

OK

>> GO TO 4.

NG

>> Go to 

MWI-4, "Work Flow"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

ASCD INDICATOR

CONDITION

SPECIFICATION

CRUISE LAMP

• Ignition switch: ON

• MAIN switch: Pressed at the 1st 

time 

→

 at the 2nd time

ON 

→

 OFF

SET LAMP

• MAIN switch: ON
• When vehicle speed : Between 

40 km/h (25 MPH) and 144 km/h 
(89 MPH)

• ASCD: Operating

ON

• ASCD: Not operating

OFF

August 2012

2012 Pathfinder