APRILIA RSV4 R Service Station Manual page 153

RSV4 R
to indicate error detection. The instrument panel does not indicate the presence of this error
even in the ATT status.
Troubleshooting
•
If shorted to positive: if a voltage higher than 5V is detected, disconnect the variable geom-
etry control unit connector and check with key ON the voltage to PIN 2: if it is higher than 5
V, restore cable harness; if equal to zero, replace the variable geometry control unit.
•
If shorted to negative: disconnect the variable geometry control unit connector and the in-
jection ECU connector and check continuity to ground of the light blue cable: if there is
continuity with the ground, restore cable harness; if insulated from ground, replace the var-
iable geometry control unit.
•
If the circuit is open: check the connector of the variable geometry control unit and the in-
jection control unit: if they are not OK, restore; if they are OK, check continuity on the light
blue cable: if not OK, restore; if OK, replace the variable geometry control unit.
•
If signal is not valid: check the connector of the variable geometry control unit, the motor
cable connector and the motor connector (check the PINS of the connector, installed directly
on the motor): if not OK, restore; if OK, check electrical characteristics of the motor: if not
OK, replace; if OK, check, with connector of the variable geometry control unit and connector
of the motor disconnected and intermediate connector connected, if the red and black cables
are in continuity, insulated from ground and without voltage and insulated one from the other:
if not OK, restore; if OK, check if the electrical motor pin is correctly inserted in the cavity of
the endless screw (however it must turn a bit): if not OK, place it correctly; if OK, replace the
variable geometry control unit.
Electrical system
ELE SYS - 153