| 1 |
Fuel vapor measurement |
EVAP VSV is turned OFF (closed) and EVAP pressure is measured. If EVAP pressure is not stable, EVAP monitor is cancelled to prevent inaccurate monitor. |
| 2 |
Vacuum introduction |
EVAP VSV is turned ON (open) and CCV is truned ON (closed). As a result, intake manifold pressure (vacuum) is introlduced to EVAP system. |
| 3 |
EVAP leak check |
EVAP VSV is turned OFF (closed) to seal EVAP system. EVAP pressure increase is measure for 5 seconds when EVAP pressure is -20 mmHg and -17 mmHg. If increase is large, ECM concludes EVAP system has a leak. |
| 4 |
Restore |
CCV is turned OFF (open) to finish EVAP Monitor |