Enable criteria

• Coolant temperature when starting between 5 -40°C. Purging is not active. Idling speed. Max. one change of status of the brake light switch. Volume of fuel in tank between 9 -54 litres. The vehicle at a standstill for 5 sec.

When the above conditions are fulfilled for more than 5 sec. the diagnosis will start. Should the diagnosis be interrupted the speed must exceed 0 on one occasion before the diagnosis is allowed to be restarted. The diagnosis continues then as follows: The shut -off valve is activated at the same time as the purging is interrupted for 3 sec. During this time the tank pressure is being observed.