For SQL 2008, the following will return a "specified service does not exist as an installed service" error:
EXEC master.dbo.xp_servicecontrol N'QUERYSTATE',N'MsDtsServer'
I changed the service name to MsDtsServer100 and it returned "Running.":
EXEC master.dbo.xp_servicecontrol N'QUERYSTATE',N'MsDtsServer100'