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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> EVAP Inspection Procedure >> Circuit Description >> Key-off monitor

Key-off monitor

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This monitor checks for EVAP system leaks and pump module malfunctions. The monitor starts 5 hours (+/-15 minutes) after the ignition switch is turned OFF. The 5 hours are required to allow enough time for the fuel to cool down. As a result, Fuel Tank Pressure (FTP) becomes stable and EVAP system monitor will be more accurate. Then, the electric vacuum pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for EVAP system leaks and pump module malfunctions based on EVAP pressure.

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