Nissan Pathfinder: Engine Control System - Basic Inspection

• Diagnosis and Repair Workflow ➤
• Basic Inspection ➤
• Service After Replacing or Removing Engine Parts
• Additional Service When Replacing Ecm ➤
• Vin Registration
• Accelerator Pedal Released Position Learning
• Throttle Valve Closed Position Learning
• Idle Air Volume Learning
• Mixture Ratio Self-Learning Value Clear
• Electric Ivt Control Actuator Position Learning
• Fuel Pressure Check ➤
• Mac Key Writing
• How to Set Srt Code ➤
• How to Erase Permanent Dtc ➤

Diagnosis and Repair Workflow ➤ Nissan Pathfinder 2022

Basic Inspection ➤ Nissan Pathfinder 2022

Service After Replacing or Removing Engine Parts Nissan Pathfinder R53

Special Repair Requirement List

×:Applicable

Part name	Service performed		Service Manual item	Reference
	Replacement	Removal
ECM	×	—	Additional service when replacing ECM	Description
Accelerator pedal position sensor	×	×*1	Accelerator pedal released position learning	Description
Electric throttle control actuator	×	×*1, 2	Throttle valve closed position learning	Description
			Idle air volume learning	Description
Electric intake valve timing control module	×	×*1	Electric intake valve timing control actuator reference position learning	Description
Electric intake valve timing control actuator	×	×*1	Electric intake valve timing control actuator reference position learning	Description
Crankshaft position sensor 1	×	—	Electric intake valve timing control actuator reference position learning	Description
Intake camshaft position sensor	×	—	Electric intake valve timing control actuator reference position learning	Description
Exhaust camshaft position sensor	×	—	Electric intake valve timing control actuator reference position learning	Description
engine mechanical parts timing chain intake/exhaust camshaft intake/exhaust camshaft sprocket Piston Connecting rod Crankshaft	×	×	Electric intake valve timing control actuator reference position learning	Description
A/F sensor 1	×	—	Idle air volume learning	Description
O2 sensor 2	×	—	Idle air volume learning	Description
Mass air flow sensor	×	—	Idle air volume learning	Description
Repair or replacement of parts affecting air-fuel ratio	×	—	Idle air volume learning	Description

*1:Harness connector disconnection is included.

*2:Carbon deposit cleaning is included.

Additional Service When Replacing Ecm ➤ Nissan Pathfinder R53

Vin Registration Nissan Pathfinder SUV

Description

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.

NOTE:

Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

(For details, refer to Work Procedure.)

Work Procedure

CHECK VIN

Check the VIN of the vehicle and note it. Refer toIdentification Number.

>>

GO TO 2.

PERFORM VIN REGISTRATION

With CONSULT

1. Turn ignition switch ON and engine stopped.

2. On CONSULT screen, select “ENGINE”>>“Work support”>>“VIN REGISTRATION”.

3. Follow the instruction of CONSULT display.

>>

END

Accelerator Pedal Released Position Learning Nissan Pathfinder 2025

Description

Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time the harness connector of the accelerator pedal position sensor or ECM is disconnected. (For details, refer to Work Procedure.)

Work Procedure

START

1. Make sure that accelerator pedal is fully released.

2. Turn ignition switch ON and wait at least 2 seconds.

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

4. Turn ignition switch ON and wait at least 2 seconds.

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

>>

END

Throttle Valve Closed Position Learning Nissan Pathfinder SUV

Description

Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle valve by monitoring the throttle position sensor output signal. It must be performed each time harness connector of electric throttle control actuator or ECM is disconnected or electric throttle control actuator is cleaned. (For details, refer to Work Procedure.)

Work Procedure

START

With CONSULT

1. Turn ignition switch ON.

2. On CONSULT screen, select “ENGINE”>>“Work support”>>“CLSD THL POS LEARN”.

3. Follow the instructions on the CONSULT display.

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

5. Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

Without CONSULT

1. Start the engine.

   NOTE:

   Coolant temperature is less than 25°C (77°F) before engine starts.

2. Warm up the engine until engine coolant temperature reaches 65°C (149°F).

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

4. Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

>>

END

Idle Air Volume Learning Nissan Pathfinder SUV

Description

Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps engine idle speed within the specific range. It must be performed under the following conditions:

• Each time electric throttle control actuator or ECM is replaced.

• Idle speed or ignition timing is out of specification.

(For details, refer to Work Procedure.)

Work Procedure

PRECONDITIONING

With CONSULT

Make sure that all of the following conditions are satisfied.

Learning will be cancelled if any of the following conditions are missed for even a moment.

• Battery voltage: More than 12.9 V (At idle)

• Engine coolant temperature: 70 – 105°C (158 – 221°F)

• Selector lever: P or N

• Electric load switch: OFF

  (Air conditioner, headlamp, rear window defogger)

  On Nissan Pathfinder vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the headlamp will not be illuminated.

• Steering wheel: Neutral (Straight-ahead position)

• Nissan Pathfinder Vehicle speed: Stopped

• Transmission: Warmed-up

• Drive vehicle until “ATF TEMP SEN” in “Data Monitor” mode of “TRANSMISSION” system indicates less than 0.9 V.

>>

GO TO 2.

PERFORM IDLE AIR VOLUME LEARNING

With CONSULT

1. Perform Accelerator Pedal Released Position Learning. Refer to Description.

2. Perform Throttle Valve Closed Position Learning. Description.

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

4. On CONSULT screen, select “ENGINE”>>“Work support”>>“IDLE AIR VOL LEARN”.

5. Touch “START” and wait 20 seconds.

Is “CMPLT” displayed on CONSULT screen?

YES>>

GO TO 3.

NO>>

GO TO 4.

CHECK IDLE SPEED AND IGNITION TIMING

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

2. Let it idle for 20 seconds.

3. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. Refer to Idle Speed and Ignition Timing.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 4.

DETECT MALFUNCTIONING PART-I

Check the following

• Check that throttle valve is fully closed.

• Check PCV valve operation.

• Check that downstream of throttle valve is free from air leakage.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace malfunctioning part.

DETECT MALFUNCTIONING PART-II

Engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident.

It is useful to perform “TROUBLE DIAGNOSIS - SPECIFICATION VALUE”. Refer to Diagnosis Procedure.

If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle Air Volume Learning again:

• Engine stalls.

• Erroneous idle.

>>

INSPECTION END

Mixture Ratio Self-Learning Value Clear Nissan Pathfinder Fifth generation

Description

This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instructions in “Diagnosis Procedure”. (For details, refer to Work Procedure.)

Work Procedure

START

With CONSULT

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

2. On CONSULT screen, select “ENGINE”>>“Work support”>>“SELF-LEARNING CONT”.

3. Clear mixture ratio self-learning value by touching “CLEAR”.

With GST

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

2. Turn ignition switch OFF.

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

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

5. Stop engine and reconnect mass air flow sensor (bank 1) harness connector.

6. Select Service $03 with GST. Make sure DTC P0102 is detected.

7. Select Service $04 with GST to erase the DTC P0102.

>>

END

Electric Ivt Control Actuator Position Learning Nissan Pathfinder 2022

Description

Electric intake valve timing control (IVT) module requires the learning of camshaft reference position.

This learning must be performed where the following operations are performed:

• Replacement of electric IVT control module

• Replacement of intake/Exhaust camshaft position sensor

• Replacement of crankshaft position sensor 1

• Removal and installation of timing chain

• Replacement of the mechanical parts listed below:

  • Replacement of timing chain

  • Replacement of intake/exhaust camshaft

  • Replacement of intake/exhaust camshaft sprocket

  • Replacement of piston

  • Replacement of connecting rod

  • Replacement of crankshaft

(For details, refer to Work Procedure.)

NOTE:

If learning is not performed after the replacement of the above listed parts, the engine may not be able to be started.

Work Procedure

START

Do you have CONSULT?

YES>>

GO TO 2.

NO>>

GO TO 3.

ELECTRIC INTAKE VALVE TIMING (IVT) CONTROL ACTUATOR REFERENCE POSITION LEARNING

With CONSULT

1. Turn ignition switch ON.

2. On CONSULT screen, select All DTC Reading and check that any DTC is not detected.

3. Select “ENGINE” >> “Work support” >> “Electric intake valve timing control learning”.

4. Touch “Start” and start the engine within 10 seconds.

5. Let the engine be idle.

6. Check that “COMPLETED” is displayed.

Is the learning completed normally?

YES>>

END

NO>>

Check that DTC is not detected and restart the learning.

PERFORM ELECTRIC IVT CONTROL ACTUATOR REFERENCE POSITION LEARNING

Without CONSULT

1. Turn ignition switch OFF.

2. Disconnect electric IVT control actuator harness connector (actuator side).

3. Turn ignition switch ON and wait at least 70 seconds.

4. Turn ignition switch OFF.

5. Reconnect the disconnected harness connector.

6. Start engine and let it idle at least 15 seconds.

7. Turn ignition switch OFF.

8. Check and erase DTC.

>>

END

Fuel Pressure Check ➤ Nissan Pathfinder SUV

Mac Key Writing Nissan Pathfinder 2025

Description

When replacing ECM, it is necessary to write MAC key to ECM. Write MAC key to ECM according to "MAC Key writing" procedure of "CONSULT Operation Manual". Refer to Work Procedure.

CAUTION:

During MAC key writing, maintain the following conditions:

• Ignition switch ON

• CONSULT is connected to internet

Work Procedure

PERFORM MAC KEY WRITING

1. Ignition switch ON.

2. Select "MAC Key writing" on "Work Support" of "ECM" using CONSULT.

3. Touch "Write".

YES>>

INSPECTION END

How to Set Srt Code ➤ Nissan Pathfinder 2025

How to Erase Permanent Dtc ➤ Nissan Pathfinder