EVAP System Leak Monitor

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 113°F (45°C) or less.
• Atmospheric temperature is 41-113°F (5-45°C).
• Selector lever is in "D" range.

Monitor takes about 8 minutes to complete. To run monitor, use illustration. See Fig 1. Perform steps as follows:

1. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
2. Start engine.
3. Accelerate to 55-60 MPH.
4. Travel for 200 seconds or more while keeping speed at 55-60 MPH.
5. While keeping accelerator pedal position constant, keep speed at 55-60 MPH for 150 seconds or more (this is when monitor runs).
6. Return vehicle to shop and turn ignition off. Confirm that DTC is not set. If DTCs P0441, P0442, P0451, P0452, P0453, P0455 or P0456 is set, refer to specific EVAP Emission Control System procedure in DIAGNOSTIC TESTS. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  for directions.

Fig 1: Running EVAP System Leak Monitor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.