Nissan Pathfinder (2012 year). Manual - part 288

P2138 APP SENSOR

EC-385

< DTC/CIRCUIT DIAGNOSIS >

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Diagnosis Procedure

INFOID:0000000007358353

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-97, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect accelerator pedal position (APP) sensor harness connector.

2. Turn ignition switch ON.

3. Check voltage between APP sensor terminals 2 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

3.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

Check voltage between APP sensor terminal 1 and ground with

CONSULT or tester. 

1.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 4.

4.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.

BBIA0539E

Voltage: Approximately 5V

BBIA0556E

PBIB2608E

Voltage: Approximately 5V

PBIB2611E

August 2012

2012 Pathfinder

EC-386

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P2138 APP SENSOR

2. Disconnect ECM harness connector.

3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.

Refer to wiring diagram.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit.

5.

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

OK or NG

OK

>> GO TO 6.

NG

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

6.

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-207, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 7.

7.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace electric throttle control actuator. Refer to 

EM-27, "Removal and Installation"

.

>>

INSPECTION END

8.

CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between APP sensor terminals 4 and ECM terminal 82, APP sensor terminal 5

and ECM terminal 83.

Refer to Wiring Diagram.

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

OK

>> GO TO 9.

NG

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

9.

CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 106 and APP sensor terminal 3, ECM terminal 98 and

APP sensor terminal 6.

Refer to Wiring Diagram.

2. Also check harness for short to ground and 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 APP SENSOR

Continuity should exist.

ECM terminal

Sensor terminal

91

APP sensor terminal 1

47

Electric throttle control actuator terminal 2

Continuity should exist.

Continuity should exist.

August 2012

2012 Pathfinder

P2138 APP SENSOR

EC-387

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Refer to 

EC-387, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

>>

INSPECTION END

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358354

ACCELERATOR PEDAL POSITION SENSOR

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 sig-

nal), 98 (APP sensor 2 signal) and ground under the following

conditions.

4. If NG, replace accelerator pedal assembly. Refer to 

ACC-4, "Removal and Installation"

.

Terminal

Accelerator pedal

Voltage

106
 (Accelerator pedal position 
sensor 1)

Fully released

0.65 - 0.87V

Fully depressed

More than 4.3V

98
(Accelerator pedal position 
sensor 2)

Fully released

0.28 - 0.48V

Fully depressed

More than 2.0V

MBIB0023E

August 2012

2012 Pathfinder

EC-388

< DTC/CIRCUIT DIAGNOSIS >

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P2A00, P2A03 A/F SENSOR 1

P2A00, P2A03 A/F SENSOR 1

Component Description

INFOID:0000000007358355

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 about 800

°

C

(1,472

°

F).

On Board Diagnosis Logic

INFOID:0000000007358356

To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored so it will

not shift to LEAN side or RICH side.

DTC Confirmation Procedure

INFOID:0000000007358357

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.

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 11V at idle.

 WITH CONSULT

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

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. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-

SULT.

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

JPBIA4038GB

PBIB3354E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P2A00
2A00
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit range/performance

• The output voltage computed by ECM from the 

A/F sensor 1 signal shifts to the lean side for a 
specified period.

• The A/F signal computed by ECM from the A/F 

sensor 1 signal shifts to the rich side for a spec-
ified period.

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

P2A03
2A03
(Bank 2)

August 2012

2012 Pathfinder

P2A00, P2A03 A/F SENSOR 1

EC-389

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7. Turn ignition switch OFF and wait at least 10 seconds.

8. Turn ignition switch ON.

9. Turn ignition switch OFF and wait at least 10 seconds.

10. Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.

11. Let engine idle for 1 minute.

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

13. Check 1st trip DTC.

14. If 1st trip DTC is detected, go to 

EC-389, "Diagnosis Procedure"

.

 WITH GST

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

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. Disconnect mass air flow sensor harness connector.

6. Start engine and let it idle for at least 5 seconds.

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

nector.

8. Select Service $03 with GST and make sure that DTC P0102 is

detected.

9. Select Service $04 with GST and erase the DTC P0102.

10. Start engine and keep the engine speed between 3,500 and

4,000 rpm for 1 minute under no load.

11. Let engine idle for 1 minute.

12. Keep engine speed between 2,500 and 3,000 rpm for 20 min-

utes.

13. Select Service $07 with GST.

If 1st trip DTC is detected, go to 

EC-389, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000007358358

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-97, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1 AND HEATED OXYGEN SENSOR 2

Loosen and retighten the air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. Refer to 

EC-41, "Engine

Control Component Parts Location"

.

>> 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 detected?

YES

>> Repair or replace.

BBIA0541E

BBIA0539E

August 2012

2012 Pathfinder

EC-390

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P2A00, P2A03 A/F SENSOR 1

NO

>> GO TO 4.

4.

CHECK FOR INTAKE AIR LEAK

1. Start engine and run it at idle.

2. Listen for an intake air leak 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 harness connector.

4. Restart engine and let it idle for at least 3 seconds.

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

nector.

6. Make sure DTC P0102 is displayed.

7. Erase the DTC memory. Refer to 

EC-74, "On Board Diagnosis

Function"

.

8. Make sure DTC P0000 is displayed.

9. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172 or P0174, 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-185

 or 

EC-191

.

No

>> GO TO 6.

6.

CHECK HARNESS CONNECTOR

1. Turn ignition switch OFF.

2. Disconnect A/F sensor 1 harness connector.

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.

BBIA0541E

Water should not exit.

BBIA0544E

August 2012

2012 Pathfinder

P2A00, P2A03 A/F SENSOR 1

EC-391

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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 E2, F32

• IPDM E/R connector E119

• 15 A fuse (No.51)

• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

9.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

Refer to Wiring Diagram.

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

Refer to Wiring Diagram.

5. Also check harness for short to ground and 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-105, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 13.

Voltage: Battery voltage

PBIB3308E

A/F sensor 1 terminal

ECM terminal

Bank 1

1

35

2

56

Bank 2

1

16

2

75

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-392

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P2A00, P2A03 A/F SENSOR 1

11.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-169, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace heated oxygen sensor 2. Refer to 

EC-41, "Engine Control Component Parts Location"

.

12.

CHECK INTERMITTENT INCIDENT

Perform 

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 

EC-41, "Engine Control Component Parts Location"

.

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 Heated Oxygen Sensor

Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> GO TO 14.

14.

CONFIRM A/F ADJUSTMENT DATA

1. Turn ignition switch ON.

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

3. Make sure that “0” is displayed on CONSULT screen.
OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 15.

15.

CREAR A/F ADJUSTMENT 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”.

Without CONSULT

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

2. Turn ignition switch OFF.

3. Disconnect mass air flow sensor harness connector.

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. Make sure DTC P0102 is displayed.

7. Erase the DTC memory. Refer to 

EC-74, "On Board Diagnosis

Function"

.

8. Make sure 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. Make sure that “0” is displayed on CONSULT screen.
OK or NG

OK

>>

INSPECTION END

BBIA0541E

August 2012

2012 Pathfinder