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.

NOTE:
- Secure all hose connections using hose clamps appropriate for the model type.
- Replace seals and gaskets when performing repair work.

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

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

If a leak is found:
- 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. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If a DTC was set and does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC returns and no leaks are found in the EVAP and Fuel Supply System:
- Check the DTC memory 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. Diagnostic Mode 03 - Read DTC Memory

End diagnosis.