Leak Detection Pump: Testing and Inspection

Special Tools
999 5843

A1 - Checking the Canister Purge (CP) valve





- Remove the Canister Purge (CP) valve, see Replacing the Canister Purge (CP) valve, refer to Service and Repair
- Disconnect the hose connections
- Connect vacuum pump 999 5843 to point B.
During pumping the vacuum meter should register under pressure. The pressure quickly returns to atmospheric pressure but during pumping a clear resistance should be felt. Air is admitted in pulses (audible) via the other connection A.
Is air admitted?

- Yes:
Go to step A2

- No:
Go to step A3

A2 - Checking the Canister Purge (CP) valve





- Connect vacuum pump 999 5843 to point A.
Is there a vacuum?
- Yes:

Go to step A4

- No:
Go to step A3

A3 - Defective Canister Purge (CP) valve
- Replace the Canister Purge (CP) valve.

A4 - Constant vacuum
- Connect the positive and negative power cables to the Canister Purge (CP) valve connection.
The vacuum should reduce. Replace the valve if it is not functioning correctly.