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Nissan Armada 2025-2026 Service and Repair Manual: Evap Leak Check

Nissan Armada 2025-2026 Service and Repair Manual / Engine / Engine Control System. Vr35ddtt / Evap Leak Check

EVAP CANISTER : Leak Check

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. Refer to Hydraulic Layout.

NOTE:

If vacuum delay valve does not have EVAP service port, remove vacuum delay valve and install EVAP service port [commercial service tool: (Part No. 149393S500)] instead.

Ignition switch ON.

On CONSULT screen, select “ECM”>>“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. Refer to Hydraulic Layout.

NOTE:

If vacuum delay valve does not have EVAP service port, remove vacuum delay valve and install EVAP service port [commercial service tool: (Part No. 149393S500)] instead.

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.

Connect pressure pump (A) to one of the ports of vacuum delay valve (1).

Close the other port of vacuum delay valve with a finger.

Apply pressure to the vacuum delay valve.

CAUTION:

Never apply pressure more than 4.12 kPa (0.042 kg/cm2, 0.6 psi).

Check vacuum delay valve for leakage.

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