MOTO GUZZI CALIFORNIA EV 1997-2000, Workshop Manual

Page: 168 / 288

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42 F
UEL SYSTEM
T
HROTTLE VALVE POTENTIOMETER CIRCUIT
When theThrottle Pos. error appears on the Dashboard
Monitor page, this meas that the electrical circuit going
from the potentiometer to the ECU is interrupted; this
means that:
• The wires are interrupted (check the circuit and the
wire connections);
• If the circuit inside the potentiometer is interrupted, it
is necessary to replace it as described in chapter 18
of this section;
• On the rare occasion that the circuit inside the ECU is
interrupted: replace the ECU as described in chapter
13 of this section;
A further check can be carried out on the signal coming
from the potentiometer through the Dashboard Monitorʼs
front page. In fact, at the RH top of this page it is possible
to view the opening angle for the throttle body. Taking into
account that max. opening is 84°, the user can
immediately trace any possible signal error.
In this situation the fault is found, in 90 % of cases, in an
incorrect operation of the potentiometer, while the
remaining 10% of cases refer to an incorrect ECU
operation.
A
BSOLUTE PRESSURE SENSOR CIRCUIT
As previously explained, the absolute pressure sensor is
located inside the ECU; if the item Pressure on the page
displays an error, this means that there is a cut-out in the
circuit inside the ECU which goes to the sensor. In these
cases, it is necessary to reset the ECU once again; if the
error is still displayed, it must be replaced: follow the
procedures described in chapter 13 in this section.