Function, vehicles 06.96 and up
WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, 2000 Volkswagen Cabrio, 1999 Volkswagen Jetta, and 1999 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.
The Secondary air injection system injects air behind the exhaust valve for approx. 30 seconds, depending upon engine coolant temperature, load, RPM and air flow rate during the cold start (+5 °C to +40 °C engine coolant temperature).
Secondary air injection operation:
- Produces an Oxygen rich exhaust
- Causes after-burning
- Reduces the duration of the three-way catalyst heat-up phase
Activation is initiated by the Motronic Engine Control Module (ECM) -J220- via the secondary air injection system pump relay -J299- to the solenoid valve and pneumatic valve.
In addition to the engine cold start warm up phase, the secondary air injection system is checked via On Board Diagnostic (OBD)(up to an 80 °C engine coolant temperature, maximum).
If the readiness code is being created, engine coolant temperature can be above 80 °C.