Monitoring Function
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When the engine has reached idle condition, the purge valves are closed.
After the engine has settled for a moment, the purge valves are opened and closed.
The deviation of the following engine parameters are monitored:
- Lambda of each cylinder bank
- Ion current integral of each cylinder bank
- Engine speed and air mass
Because of different charcoal canister loads, different parameters of the engine will change.
If one parameter deviates more than the threshold, the corresponding purge valve is counted as good.
This procedure is repeated several times.
As soon as one purge valve has enough good-counts, the flow check for this valve is finished successfully.
If at the end one ore both purge valves have not enough good-counts, a fault code is stored for the corresponding purge valve.