APRILIA 1115-2, Workshop Manual

Page: 352 / 386

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CAUTION
Any faults with the ignition coils, driving shaft posi-
tion sensor, camshaft sensor, pressure sensors and
thermistors are automatically detected by the engine
control unit and reported on the multifunction display
with the flashing message “
(),
”.
For this reason, the malfunctions of these compo-
nents are not repeated in the troubleshooting table;
see relevant chapters in sect. 4 (FUEL SUPPLY SYS-
TEM) and sect. 6 (ELECTRIC SYSTEM).
NOTE
In the following table, the operations marked
with (*) must be carried out consulting the Engine service
and repair manual, see 0.4.1 (ENGINE SERVICE AND
REPAIR MANUALS).
8.1.1 ENGINE
DEFECT SYMPTOM AND POSSIBLE CAUSES REMEDY
The engine does not start
or has trouble starting Engine shutoff switch set to “
1
” Set to “
2
”
Starting safety logic not satisfied Check and restore the
necessary conditions
Fall sensor faulty Replace
Vent hole on tank cap clogged Clean
Battery charge insufficient Recharge
Battery damaged Replace
Free-wheel, gear free-wheel worn or faulty Replace (*)
Double gear or intermediate gear of the starter motor worn or
faulty
Replace (*)
Starter motor toothing broken Replace (*)
Spark plugs dirty Replace
Spark plugs wet Clean or replace
Spark plugs loose Tighten
Spark plugs are not to spec. Replace
Cold start cable not working Check
Fuel filters dirty or fuel supply pipes clogged Clean or replace
Fuel pump, relay or wiring faulty Replace
Fuel pressure regulator faulty Replace
Injectors faulty Replace
Valve clearance incorrect Adjust (*)
The engine has trouble
idling Idling rpm too low Adjust
Air cleaner dirty Clean
Intake coupling leaking Replace
Incorrect synchronization of both cylinders Synchronize the cylinders
Throttle body connection hoses damaged or cracked Replace
Throttle valve shaft/housing worn Replace
See the subsection entitled (The engine does not start or has trouble starting) for other pos-
sible causes
The engine runs irregu-
larly at higher speeds Fuel outflow union clogged, which reduces the fuel supply to
the injectors Clean and resupply the fuel
system
Intake conveyors and pipes clogged Check
Air penetrating through the throttle body or intake coupling Replace
Fuel pressure too low
Clean fuel system or
change pump.
Fuel supply pump faulty Replace
Camshafts worn Replace (*)
See the subsection entitled (The engine does not start or has trouble starting) for other pos-
sible causes
Follow
ã
Release 00/2002-10
- 00