EVAP Monitor Repair Verification Drive Mode
NOTE:
Intake Air Temperature (IAT) PID must be 20-100°F (-6.7-37.6°C) to start EVAP system monitor. Fuel level (FLI) PID must be 15-85 percent to start EVAP system monitor. Ensure drive mode conditions are met 4-10 minutes after starting engine. If time exceeds 10 minutes, turn ignition off to reset timer. Restart engine. After monitoring conditions are set, system testing requires 30 seconds or more to complete. Fuel tank pressure will change during monitoring as shown in illustration. SeeFig 1.
NOTE:
Eight hour cold soak time may be shortened by 3 hours depending on conditions. If soak period is shortened, PCM may detect a malfunction even after repairs. This may happen during warm or hot ambient conditions.
- Cold soak vehicle for 8 hours before performing EVAP monitor repair verification drive mode. In cold weather conditions, 8 hour cold soak time may not be necessary and can be shortened by 3 hours. To shorten cold soak, go to step 4. Connect scan tool. Turn all accessories off and go to next step.
- Start engine. Accelerate to 38-65 MPH within 4-10 minutes. Drive vehicle at 38-65 MPH for at least 2 minutes. Stop vehicle and allow to idle for 20 seconds.
- Access ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTIONS to check drive mode completion status. RFC should change from NO to YES when test is complete. If test is not complete, repeat previous step. If test is complete, check test results in DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS. If results are okay (MEAS are within specification), ensure no DTCs are present. If no DTCs are present, repairs are complete. If results are not okay (MEAS are not within specification), repairs are not complete.
- To by-pass 8 hour soak time, cool fuel tank as much as possible. Connect scan tool. Turn ignition on. Access CLEAR DIAGNOSTIC CODES menu of GENERIC OBD II FUNCTIONS. Press TRIGGER to reset timer. Leave ignition on. Perform drive mode test.