Fuel injection amount learning process (diesel-powered vehicles)
To keep exhaust emissions and engine noise low, the engine very occasionally performs a learning process for the fuel injection amount.
The engine sounds slightly different from usual while the learning process is taking place. The change in the engine sound does not indicate a fault.
See also:
Activation
The Auto Stop & Go (AS&G) system is automatically activated when the ignition
switch is turned to the “ON” position. ...
When turning from “ACC” to “LOCK”
[Vehicles equipped with M/T] Put the gearshift lever into the “N” (Neutral) position,
and slowly turn the ignition switch to the “LOCK” position while pressing it.
[Vehicles equipped with C ...
How to adjust the tone
Press the AUDIO button (5) to select BASS - TREBLE - FADER - BALANCE Audio adjust
mode off.
BASS (Bass tone control) Press the audio adjust button (4) either
or
to select the desired bass tone ...