2005 Lexus ES 330FACTORY OEM SERVICE PROCEDURE

LEVII EVAP Monitor Process

Fig 1: EVAP Monitor Process Diagram
G02937850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
EVAP MONITOR OPERATION DESCRIPTION

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