Testing Vacuum Circuit I

TESTING VACUUM CIRCUIT I:
Switchover Valves with red/green vacuum line

Pushbutton Control Unit:

1. Push function selection button "e". Switch off ignition.

Check Valve (36), Vacuum Distributor (a):

2. Pull red/green vacuum line out of 3-point distributor (a), connect tester (refer to arrow), evacuate (approx. 600 mbar) and read pressure gauge.
3. If readout on pressure gauge changes, test switchover valves individually and replace, if required.

NOTE: Tester remains connected to vacuum line red/green for testing vacuum circuits II to IV.