This bulletin applies to checking EVAP performance on 2008 Toyota Yaris vehicles.
If DTCs P0456 or P0455 and P0441 are set, refer to inspection procedure A. If DTCs P043E, P043F, P2401 and P2419 are set, refer to inspection procedure B.
1. Visually inspect the fuel cap and all EVAP lines and connections for leaks.
2. Disconnect the fuel tank vent hose (between the fuel tank and canister) from the charcoal canister.
3. Seal off the fuel tank vent hose connection at the charcoal canister to isolate the canister side.
4. Clear any DTCs and run the auto EVAP system test again. If DTCs P0456 or P0455 and P0441 appear, the leak is on the canister side. If the system passes with no pending DTCs, the leak is on the tank side.
NOTE: The canister side consists of the charcoal canister, purge line and purge VSV. The tank side consists of the fuel tank, fual cap and filler neck. Pressurize he EVAP system through the fresh air vent line using the EVAP tester and SST adapter (SST: 00002-6872A/00002-6872A-ADP2).
1. Perform an active test using Techstream (vacuum pump).
2. Measure the voltage of the leak detection pump wires with the vacuum pump active test on. Refer to the repair manual for the voltage specification. NOTE: Back probe the leak detection motor with the electrical connector connected. Wire colors and pin numbers for the leak detection pump may vary by vehicle.
3. If voltage is not present, diagnose the electrical circuit failure. Proceed to the next step if battery voltage is present.
4. Remove the EVAP lines connected to the charcoal canister and inspect for fluid intrusion.
5. Replace the charcoal canister assembly with vacuum pump if liquid intrusion has occurred.
NOTE: For vehicles equipped with a separate vacuum pump and canister, replace only the vacuum pump. Canister replacement is only necessary if liquid intrusion has occurred.
6. Clear any DTCs and run the auto EVAP test again to confirm the repair.