Code Enable Criteria

• EVAP vent solenoid is commanded on (closed).
• EVAP purge solenoid is commanded off (closed).
• Engine is running.
• Fuel level is 15-85 percent.
• BARO more than 75 kPa.
• ECT and IAT are 39-86°F (4-30°C) at engine start-up.
• ECT and IAT are within 14°F (8°C) of each other.
• Throttle angle 7-35 percent.
• Vehicle speed less than 70 MPH.
• No ECT, fuel tank pressure, IAT, MAP, O2S1, PCM internal fault, TP or VSS DTCs are set.

DTC sets when vacuum decay is more than 0.02-0.10 volts per second at fuel pressure sensor for more than 15 seconds. 0.02 volt is with a low fuel level and 0.10 volt is with a high fuel level.