Nissan Pathfinder: Engine Control System - Periodic Maintenance

• Idle Speed
• Ignition Timing
• Evap Leak Check
• Positive Crankcase Ventilation

Idle Speed Nissan Pathfinder Fifth generation

Inspection

CHECK IDLE SPEED

With CONSULT

Check idle speed in “Data Monitor” mode of “ENGINE”.

With GST

Check idle speed with Service $01 of GST.

Ignition Timing Nissan Pathfinder SUV

Inspection

CHECK IGNITION TIMING

1. Attach timing light (A) to loop wire as shown.

   

2. Check ignition timing.

   

   Specification

   : Ignition Timing

Evap Leak Check Nissan Pathfinder 2025

Inspection

CAUTION:

• Never use compressed air or a high pressure pump.

• Never exceed 4.12 kPa (0.042 kg/cm², 0.6 psi) of pressure in EVAP system.

NOTE:

• Never start engine.

• Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

WITH CONSULT

To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port.

Turn ignition switch ON.

On CONSULT screen, select “ENGINE”>>“Work support”>>“EVAP SYSTEM CLOSE”.

Touch “START”. A bar graph (Pressure indicating display) will appear on the screen.

Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.

Remove EVAP service port adapter and hose with pressure pump.

Locate the leak using a leak detector. Refer to System Description.

WITHOUT CONSULT

To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port.

Apply battery voltage between the terminals of EVAP canister vent control valve to make a closed EVAP system.

To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm², 0.2 to 0.4 psi).

Remove EVAP service port adapter and hose with pressure pump.

Locate the leak using a leak detector. Refer to System Description.

Positive Crankcase Ventilation Nissan Pathfinder 2025

Inspection

CHECK PCV VALVE

With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes through it. A strong vacuum should be felt immediately when a finger is placed over valve inlet.

Perform the following procedure according to the inspection results.

• Inspection results normal: INSPECTION END

• Inspection results abnormal: Replace PCV valve. Refer to Component Parts Location.

Unit Disassembly and Assembly. Cylinder Block ++Transaxle & Transmission