Toyota EVAP DTCs
This applies to all Toyota vehicles with Key Off EVAP systems, where DTCs P0456, P0455 & P0441; or P043E, P043F, P2401, P2402 or P2419 are present.
- Clear any DTCs and run the automatic EVAP system check.
- Check for pending DTCs
a. DTCs P0456 or P0455 & P0441 set – refer to inspection procedure A.
b. DTCs P043E, P043F, P2401, P2402 & P2419 set – refer to inspection procedure B.
INSPECTION PROCEDURE A
- Visually inspect the fuel cap and all EVAP lines/connections for leaks.
- Disconnect the fuel tank vent hose (between the fuel tank and the canister) from the charcoal canister.
- Seal off the fuel tank vent hose connection at the charcoal canister to isolate the canister side.
- Clear any DTCs and run the auto EVAP system test again.
a. If DTCs P0456 or P0455 & P0441 appear in pending, the leak is on the canister side.
b. 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, gas cap and filler neck.
- Pressurize the EVAP system through the fresh air vent line using the EVAP Tester & SST adapter (00002-6872A; 00002-6872A-ADP2). Check for leaks on the tank or canister side as needed.
INSPECTION PROCEDURE B
- Perform an active test using Techstream (Vacuum Pump).
- Measure the voltage of the leak detection pump wires with the vacuum pump active test on. Refer to the appropriate repair manual for the voltage specification.
NOTE: Back probe the leak detection pump motor with the electrical connector connected. Wire colors and pin numbers for the leak detection pump may vary by vehicle.
- If voltage is not present, diagnose the electrical circuit failure. Proceed to the next step if battery voltage is present.
- Remove the EVAP lines connected to the charcoal canister and inspect for liquid intrusion.
- 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.
- Clear any DTCs and run the auto EVAP test again to confirm the repair.