Press key F5 in the system main menu, select the
desired test using the arrow keys and confirm with YES.
Follow the instructions in the TECH 1 display.
Note:
As the hose at the controlled canister purge valve is only
accessible with some difficulty, the check can also be performed as follows:
Do not disconnect hose. Carry out check as described above.
When the controlled canister purge valve is opened via
TECH 1, the engine is supplied with additional fuel which can lead to a
brief drop in engine speed.
A precondition for this, however, is that enough fuel
vapour has been collected in the activated carbon canister.
If the engine speed does not sink during this actuator
test, this may be because there is not enough fuel vapour in the activated
carbon canister.
If, however, there is too much fuel in the activated carbon
canister, the engine speed may sink so low t at the engine stalls.
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