Cylinders synchronisation
The control unit knows the intake pressures in the
four ducts due to the two pressure sensors: know-
ing the cylinder operating phases, it is able to
distinguish the individual pressures of the four cyl-
inders.
The control unit is able to adjust the balancing of
the vacuums between the cylinders of the front
bank and those of the rear bank due to the two
independent throttle body motors, but is not able
to balance the pressures of the master cylinder
(the one closest to the motor) and the slave cylin-
der.
If there is even a minimum irregularity, it is possible to check and possibly adjust the by - pass screws
to correctly balance the cylinders 1-3 and 2-4.
With the diagnostic tool, select cylinder pressure balancing from the Adjustable parameters screen
page.
In order for the procedure to start:
•
the engine water temperature must be higher than 80 °C (176 °F);
•
the engine must be idling;
•
there must not be any errors in the control unit.
When the fans turn on (approx. 101°C - 214°F) the procedure is stopped and cannot be performed.
During the procedure, the position of the handle 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.
TUONO V4 R a-PRC ABS Power supply
P SUPP - 389
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