Test 3: Check Vacuum System

Check vacuum system

Fig. legend/ fig.





- 019 Vacuum tester
- 126 Shutoff valve Secondary air injection

Test prerequisite
- The voltage supply to component Y32 (Air pump switchover valve) is OK.

Test sequence
- Switch off ignition.
- Connect the vacuum tester to the input of component Ventil Lufteinblasung with the 3 x distributor.
- Operate engine at idling speed.
- Actuate component Switchover valve, then with key F2.

Specified value
- Vacuum >400 mbar

Communication with ECU required