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 amount of fuel in tank) MIL Operation 2 driving cycles Sequence of Operation None TYPICAL ENABLING CONDITIONS Monitor runs whenever following DTCs not present P0452, P0453 (EVAP system) Atmospheric pressure 70 to 110 kPa-a (525 to 825 mmHg-a) Battery voltage 10.5 V or higher Vehicle speed Less than 4 km/h (2.5 mph) Ignition switch OFF Time after key-off 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 complete Reference pressure x 0.2 or higher Purge VSV stuck close: - EVAP pressure change after purge VSV ON (open) Less than 0.15 kPa-g (1.12 mmHg-g)
- 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 present 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 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 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 mmHg-g)