EVAP System, Checking for Leaks

EVAP System, Checking for Leaks

Special tools, testers and auxiliary items required

• Smoke tester.

• EVAP and Fuel Supply System Vacuum hose and line routing diagram.

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

• Replace seals and gaskets when performing repair work.

Test procedure

- Observe safety precautions. Refer to => [ Safety Precautions ] Safety Precautions

- Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] Clean Working Conditions

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Leak checking

- Using a Smoke tester , check the Evaporative Emission (EVAP) canister system for leaks.

• Always follow the manufacturers directions for the proper installation and operation of the Smoke tester being used.

If a leak is detected:

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

- Check the seals under the locking flanges and the union nuts are properly tightened on the fuel tank.

- Check all hose connections of the fuel supply system and replace or repair any leaking lines.

- Check all hose connections of the EVAP system and replace or repair any leaking lines.

- Repair or replace any damaged component.

If no leaks are found in the EVAP and Fuel Supply System:

- Erase the DTC memory if a DTC was set. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify repair.

If the DTC was set and does not return:

Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

If the DTC does return and no leaks are found in the EVAP and Fuel Supply System:

- Check for any DTC codes pertaining to the EVAP and Fuel Supply Systems. If a DTC is stored, perform the diagnostic test procedure for the suspected component. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.