Supersedes Technical Service Bulletin Group 01 number 15-46 dated October 8, 2015. The Mil is on. DTCs are stored in the ECM. The DTCs may appear during monitoring of the secondary air system during the engine cold starting phase. With the electric solenoid valves controlled, a diagnosis cycle is performed and the secondary air pressure is measured for a specified value. The secondary air pressure can be influenced by several factors; which may include a leak in the vacuum system.