Generic Scan Tool

Secondary Air Injection System

--> [ Secondary Air Injection System, Checking for Leaks ] Secondary Air Injection System, Checking For Leaks

--> [ Secondary Air Injection Valve, Checking ] Secondary Air Injection Valve, Checking

--> [ Secondary Air Injection Pump Motor, Checking ] Secondary Air Injection Pump Motor, Checking

--> [ Combination Valve, Checking ] Combination Valve, Checking

For all Secondary Air Injection System component locations. Refer to the service information.

CAUTION!
Observe the following for all installations, especially in engine compartment due to lack of room:

• Route lines of all types (e.g. for fuel, hydraulic, EVAP canister system, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.

• Watch for sufficient clearance to all moving or hot components.

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 converters. 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) and to the combination valve.

• 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.