OBD II MONITOR SPECIFICATIONS
- Key-off Monitor MONITOR STRATEGY Required Sensors/Components Purge VSV Canister pump module Frequency of Operation Once per driving cycle Duration Within 15 minutes (varies with amount of fuel in tank) MIL Operation 2 driving cycles Sequence of Operation None TYPICAL ENABLING CONDITIONS Monitor runs whenever following DTCs not stored None EVAP key-off monitor runs when all of following conditions met - Atmospheric pressure 70 to 110 kPa-a (525 to 825 mmHg-a) Battery voltage 10.5 V or higher Vehicle speed Less than 2.5 mph (4 km/h) Ignition switch off Time after key-off 5, 7 or 9.5 hours Canister pressure sensor malfunction (P0451, P0452) Not detected 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 is 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 0.22 Purge VSV stuck closed: - EVAP pressure change after purge VSV open Below 0.3 kPa (2.25 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 Monitor runs whenever following DTCs not stored None Engine Running Engine coolant temperature 4.4°C (40°F) or higher Intake air temperature 4.4°C (40°F) or higher Canister pressure sensor malfunction (P0451, P0452) Not detected Purge VSV Not operated by scan tool EVAP system check Not operated by scan tool Battery voltage 10 V or higher Purge duty-cycle 8% or more TYPICAL MALFUNCTION THRESHOLDS Both of following conditions met Conditions 1 and 2 1. EVAP pressure change when purge operation started Below 0.1 kPa (0.75 mmHg) 2. EVAP pressure change during purge operation when vent valve closed Below 0.4 kPa (3.0 mmHg)