Evaporative Emission Canister System, Checking For Proper Seal

NOTE:

Secure all hose connections using hose clamps appropriate for the model type.

Replace seals and gaskets when performing repair work.

Test procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

-- Connect the scan tool.

-- Start the engine and let run at idle for at least 15 minutes.

-- Select "Diagnostic mode 8: Tank leak test".

-- Select the "Test-ID 01: Tank leak test" and check the specified value at idle.

Specified value: test OK

NOTE:

If the accelerator pedal is depressed during the test, the test will be aborted.

To repeat the tank leak-tightness test, switch the ignition off, start the engine again, and let it run at idle.

If the specified value was obtained:

-- Switch the ignition OFF. Fault may be loose gas cap or intermittent leak. Check freeze frame values for ambient temp as failure may only occur during extreme hot or cold temperature and may assist in duplicating the leak.

If the specified value was Not obtained:

Checking fuel supply and tank ventilation systems for leaks

-- Ensure the fuel filler cap is properly installed on the fuel tank.

-- Check the fuel filler cap seal for damage. Replace if necessary.

-- Remove the rear seat. Refer to the Repair information.

-- Remove the floor cover seal.

-- Inspect the seal under the Fuel Delivery Unit (fuel pump) locking flange for proper sealing. Check the fuel line connections and left side sender if vehicle is all wheel drive.

-- Visually check all hose connections of the fuel supply system and replace any leaking lines.

Check the line from the EVAP canister to the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.
Check the lines from the EVAP canister to the Leak Detection Pump (LDP) -V144-.
Check the line from the fuel tank to the EVAP canister (below cover for EVAP canister).
Check the lines for the tank ventilation (beneath right rear wheel housing liner).
Check the fuel lines to the engine.

NOTE:

Leaks at the lines and components of the fuel tank ventilation system can sometimes be located using a non flammable, environmentally compliant leak detection spray. Initiate the leak diagnosis several times in sequence to build up pressure in the system. At leaking areas, bubbles will form.

-- Repeat the function test.

If a leak is detected:

-- Perform a visual inspection on the fuel system components and tank ventilation system.

Fuel tank.
EVAP canister.
Leak Detection Pump (LDP) -V144-.
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.

NOTE:

Due to the form or function of the components, leaking areas may not always be localized by spraying on the leak detection spray. It may be necessary to clamp off the relevant component using Hose Clamps Up To 25 mm Diameter. and initiate the tank leak detection diagnostic. If the leak is no longer indicated, the component that was clamped off is faulty. If clamped off directly at the leak detection pump and a leak is still indicated, the leak detection pump itself is leaking.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .