OBD II MONITOR SPECIFICATIONS
- Key-off Monitor MONITOR STRATEGY Required Sensors/Components Purge VSV and Canister pump module Frequency of Operation Once per driving cycle Duration Within 15 minutes (varies with fuel in tank) MIL Operation 2 driving cycles Sequence of Operation None TYPICAL ENABLING CONDITIONS Monitor runs whenever following DTCs not stored P0452, P0453 (EVAP system) Atmospheric pressure 75 to 110 kPa (563 to 825 mmHg) Battery voltage 10 V or higher Vehicle speed Less than 4 km/h (2.5 mph) Ignition switch Off Time after engine stopped 5, 7 or 9.5 hours Purge VSV Not operated by scan tool Vent valve Not operated by scan tool Leak detection pump Not operated by scan tool Both of following conditions met before key-off Conditions 1 and 2 1. Duration that vehicle driven 5 minutes or more 2. EVAP purge operation Performed Engine coolant temperature 4.4 to 35°C (40 to 95°F) Intake air temperature 4.4 to 35°C (40 to 95°F) TYPICAL MALFUNCTION THRESHOLDS Purge VSV stuck open - EVAP pressure when vacuum introduction is complete Higher than reference pressure x 0.2 Purge VSV stuck closed - EVAP pressure change after EVAP canister purge valve is open Less than 0.3 kPa (2.25 mmHg)
- Purge Flow Monitor MONITOR STRATEGY Required Sensors/Components Purge VSV and canister pump module Frequency of Operation Once per driving cycle Duration Within 10 minutes MIL Operation 2 driving cycles Sequence of Operation None TYPICAL ENABLING CONDITIONS Monitor runs whenever following DTCs not stored P0452, P0453 (EVAP system) Engine Running Engine coolant temperature 4.4°C (40°F) or higher Intake air temperature 4.4°C (40°F) or higher EVAP pressure sensor malfunction Not detected EVAP canister purge valve Not operated by scan tool EVAP system check Not operated by scan tool Atmospheric pressure 75 to 110 kPa (563 to 825 mmHg) Battery voltage 10 V or higher (intake air temperature below 50°C) or 12 V or higher (intake air temperature 50°C or higher) Purge duty cycle 8% or more TYPICAL MALFUNCTION THRESHOLDS Both of following conditions are met Conditions 1 and 2 1. EVAP pressure change when purge flow is started Less than 0.1 kPa (0.75 mmHg) 2. EVAP pressure change during purge flow when EVAP pressure switching valve is ON (closed) Less than 0.4 kPa (3 mmHg)