OBD II MONITOR SPECIFICATIONS
- Key-off Monitor MONITOR STRATEGY Related DTCs P0441: Purge VSV stuck open/closed P0441: Purge flow Required Sensors/Components Purge VSV 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 EVAP key-off monitor runs when all of following conditions are met - Atmospheric pressure 70 to 110 kPa-a (525 to 825 mmHg) Battery voltage 10.5 V or more Vehicle speed Less than 2.5 mph (4 km/h) Ignition switch OFF Time after key off 5 or 7 or 9.5 hours Canister pressure sensor malfunction (P0452 and P0453) Not detected EVAP canister purge valve Not operated by scan tool EVAP canister vent valve Not operated by scan tool EVAP leak detection pump Not operated by scan tool Both of following conditions 1 and 2 are met before key off - 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 complete Higher than reference pressure x 0.2 Purge VSV stuck closed: - EVAP pressure change after purge VSV ON (open) Less than 0.3 kPa (2.25 mmHg) Purge flow: - Both of the following conditions are met Conditions (a) and (b) (a) EVAP pressure change when purge flow is started Less then 0.1 kPa (0.75 mmHg) (b) EVAP pressure change during purge flow when EVAP pressure switching valve ON (closed) Less then 0.4 kPa (3.0 mmHg)
- Purge Flow Monitor MONITOR STRATEGY Required Sensors/Components Purge VSV 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 The monitor will run whenever these DTCs are not present None Engine Running Engine coolant temperature 4.4°C (40°F) or more Intake air temperature 4.4°C (40°F) or more Canister pressure sensor malfunction Not detected Purge VSV Not operated by scan tool EVAP system check Not operated by scan tool Battery voltage 10 V or more 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 operation started Less than 0.1 kPa-g (0.75 mmHg-g) 2. EVAP pressure change during purge operation when vent valve closed Less than 0.4 kPa-g (3.0 mmHg-g)