Function - II

Function

- The secondary air injection system blows air behind the exhaust valves for 100 seconds during a cold start (+15 degrees C to +35 degrees C coolant temperature).
- This produces an oxygen rich exhaust gas, which initiates after burning and reduces the heating-up phase of the catalytic converter.
- Activation is performed by the Engine Control Module (ECM) -J220- via the Secondary Air Injection (AIR) pump relay - J299- to the Secondary Air Injection (AIR solenoid valve -N112-1), change-over and combination valves.
- The secondary air pump motor is activated, this creates a pressure and opens the combination valve at 60 to 70 mbar1).
- After each subsequent engine start (up to max. 96 degrees C engine temperature) the secondary air system will switch on for 10 seconds during idling and will be checked by On Board Diagnostic. The Oxygen sensor regulation must then be active.

1. Depending on version.