APRILIA MXV 450 - Page 69

•
The engine does not start: disconnect
the connector and, with the switch in
RUN mode, check that there is no con-
tinuity between black/white and black
cables (sensor side): if there is, replace
the switch; if there is not, check switch
connector. If NOT OK, restore cable
harness; if OK, check if there is con-
tinuity in the grey/black cable on the
cable harness side. If NOT OK, restore
cable harness; if OK, with engine on or
battery connected, check if grey / black
cable (cable harness side) has voltage
(5 V); if it has not, restore cable har-
ness or control unit connector; if it
does, replace Walbro control unit.
•
The engine does not turn off with the
switch set to "STOP": disconnect the
connector and, with the switch set to
STOP, check if there is continuity be-
tween the black/white and black cables
(sensor side). If there is no continuity,
replace the switch. If there is, it means
that with engine started/battery con-
nected, the white cable (cable harness
side) is shorted to positive: restore the
cable harness. If the cable harness is
OK, replace Walbro control unit.
Connectors
ECU
PIN Specifications
A1 Idle motor output PIN D
B1 Idle motor output PIN A
C1 Idle motor output PIN B
D1 Idle motor output PIN C
E1 Ground connection
MXV 450 Electrical system
ELE SYS - 69