Checking function
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, 1997 Volkswagen Passat, 1997 Volkswagen Jetta, and 1996 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
- Start engine and let idle.
- EGR valve diaphragm rod is pulled toward vacuum hose connector.
- Diaphragm rod visible through opening (arrow) means exhaust gas is being supplied.
- Slowly increase engine speed, when engine speed exceeds 1200 RPM, EGR is interrupted for 2 seconds.
Diaphragm rod moves toward intake manifold for 2 seconds then moves back toward vacuum connection
- Continue to raise engine speed until part throttle switch closes.
Diaphragm rod moves back toward intake manifold means EGR is interrupted.
If EGR does not work as described:
- Check activation as follows.