Function

Function

Air is blown behind the exhaust valves by the Secondary Air Injection (AIR) system during a cold start. Thereby, the emission gas is enriched with oxygen, initiating a secondary combustion and thereby shortening the warm-up phase of the catalytic converter. Activation occurs from Motronic Engine Control Module (ECM) -J220- via Secondary Air Injection (AIR) Pump Relay -J299- to Secondary Air Injection (AIR) Solenoid Valve -N112- (change-over valve) to the combination valve.

NOTE:
- Secondary Air Injection (AIR) Pump Relay -J299-*.
- Always replace seals and gaskets.
- Vacuum lines and hose connections must not have leaks.
- Vacuum hoses must not be clogged or kinked.
- For the electric components to work properly, a voltage of at least 11.5 V is required.
- Engine Control Module (ECM) is equipped with On Board Diagnostic (OBD).
- Components marked with - are tested via On Board Diagnostic (OBD). Diagnostic mode 3: Check DTC memory.
- It is possible that the control module will recognize a malfunction and store a DTC during some tests. Therefore the following work steps must be performed in the mentioned sequence after ending all tests and repairs.

- Check DTC memory. Diagnostic mode 3: Check DTC Memory,
- Erase DTC memory. Diagnostic mode 4: Reset/erase diagnostic data
- For completion, Generate readiness code.
Check secondary air system for proper seal.