What does it mean when EVAP system is detected?
It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle’s fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage.
What is the target pressure for the EVAP system?
The target pressure is approximately −8.0 in.-H 2 O. If the target pressure is not achieved, the PCM concludes that there’s a large leak in the gas vapor system and, after several confirmations, will set a P0455 (gross leak).
How does the evaporative emission system ( EVAP ) work?
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
What to do if an EVAP canister leaks?
SERVICE INFORMATION If the EVAP canister leaks (or has leaked) charcoal, it must be replaced. In addition to replacing the canister, the entire EVAP emission control system must be cleaned to remove charcoal particles released by the leaking canister. To clean the EVAP emission control system, use the service procedure starting on page 3.
What are the components of the EVAP system?
The powertrain control module (PCM) uses three simple but robust components to purge gas vapors and test the gas vapor system for leak integrity. The canister purge solenoid (CPS), canister vent solenoid (CVS) and fuel tank pressure sensor (FTPS) are the heart of the system.
When does an EVAP system malfunction is detected?
Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly. This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum.
What does EVAP stand for in gas tank?
That’s a lot of vapor tubes. EVAP stands for the evaporative emission control system. It’s job is to trap any gas vapors that are trying to escape the tank or fuel system in your vehicle. Those trapped vapors can be recirculated and used in the engine rather than polluting the environment.
Where is the service port for the EVAP system?
It’s located on the driver side in the engine compartment; the service port is that “T” connection with the little green cap. If the problem is not there, take your truck to a repair shop to have the EVAP system tested with the smoke machine. It may cost from $40 to $110, but it works pretty well for detecting EVAP leaks.