EVAP System Leak Monitor
On small leaks, the PCM monitors the leak of fuel evaporation gas by the reduction of vacuum in tank after appointed time using the fuel tank differential pressure sensor after sealing the fuel tank and the fuel line and applying vacuum.
On large leaks, the PCM monitors the leak of fuel evaporation gas by checking whether the pressure can be reduced (the amount of pressure reduction) using the fuel tank differential pressure sensor after sealing the fuel tank and the fuel line.
This monitor applies to DTCs P0441, P0442, P0451, P0452, P0453, P0455 and P0456. Following conditions must be met during the test:
- Engine coolant temperature must be 75°F (30°C) or less.
- Atmospheric temperature is 41-113°F (5-45°C).
- Selector lever is in "D" range.
Test may not run if fuel tank is more than 75 percent full. Monitor takes about 8 minutes to complete. This cycle must be completed 2 times. Run monitor as shown. See Fig 1 . Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing. Perform steps as follows:
- Start engine and accelerate to 55-60 MPH.
- Travel for 200 seconds or more while keeping speed at 55-60 MPH.
- While keeping accelerator pedal position constant, keep speed at 55-60 MPH for 150 seconds or more (this is when monitor runs).
- Return vehicle to shop and Turn the ignition switch to LOCK position. Recheck for DTCs. If DTC P0441, P0442, P0451, P0452, P0453, P0455 or P0456 resets, return to appropriate repair procedure under DIAGNOSTIC TESTS .