S3 - Component Isolation Check

- Key OFF.

- Reconnect the vacuum gauge to the same point as in Step S1, but leave the rest of the system connected. S1 - Vacuum Check

- Key ON, engine running at idle until vacuum reaches 51-64 kPa (15-19 in-Hg).

- Key OFF.

- Observe vacuum gauge for 1 minute.

- Does vacuum pressure drop more than 3.4 kPa (1 in-Hg)?

YES -- Disconnect each component one at a time and Repeat the above test procedures in until the leaking component is found. Plug the disconnected vacuum line while performing the test procedures. Repair or Replace as required.

NO -- GO to S4. S4 - Booster Leak Check