Variable geometry intake
Variable geometry intake
Cylinders synchronisation
The control unit receives information on the intake
pressure in the four ducts from the two pressure
sensors: as the control unit knows the timing
phase of the cylinders, it can calculate the individ-
ual pressure of the four cylinders.
The control unit can equalise the depression be-
tween the front and rear cylinder banks by con-
trolling two motors that are independent of the
throttle bodies, but cannot equalise the pressure
between the master cylinder (the cylinder closest
to the motor) and the slave cylinder.
If irregular idling is noted, the By-pass screws can be checked and adjusted if necessary to ensure
correct equalisation between cylinders 1-3 and 2-4.
On the diagnostic instrument, select Cylinder pressure equalisation from the Adjustable parameters
screen.
In order for the procedure to start:
•
the engine must have a water temperature above 80 °C (176 °F);
•
be at the idling speed;
•
there may not be any control unit errors.
As soon as the fans are activated (approx. 101°C - 214°F), the procedure is aborted and cannot be
carried out.
During the procedure, the position of the handgrip position sensor is not considered.
A screen is displayed indicating the By-pass
screws for cylinders 1 and 3 and whether the
screw setting is correct, or whether it must be
opened/closed by a small (1/8 turn) or large (1/4
turn) amount.
If the measure is related the Slave screws, (2-3
cylinder) any removal is useless.
Power supply RSV4 Factory a-PRC
P SUPP - 396
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