APRILIA Pegaso 650 I.E., Service Manual

Page: 162 / 320

ELECTRIC SYSTEM
6 - 14
Pegaso 650 I.E.
6.5.4 ELIMINATING ELECTRONIC SYSTEM FAULTS
a
CAUTION
Take care around the high voltage in the ignition sys-
tem.
Never disconnect connections with the engine run-
ning.
Whenever work is performed in the ignition system,
always make sure the ignition switch is set to “
1
”
and the battery disconnected, unless otherwise indi-
cated (when disconnecting the battery, disconnect
the negative pole “–” first).
a
CAUTION
All measurements must be taken with the compo-
nents at a temperature of 20 °C (68 °F). General in-
structions regarding the elimination of faults: as
soon as the fault has been located, remove the defec-
tive component.
Perform the checks indicated in the following chapters:
– 6.5.10 (CHECKING THE PICK-UP);
– 6.5.6 (CHECKING THE THROTTLE VALVE POTEN-
TIOMETER);
– 6.5.8 (CHECKING THE COOLANT THERMISTOR
OPERATION).
If the engine does not start and the diagnostics fail to de-
tect any fault, check (in the given order) whether:
– the fuel pump is working properly, see 6.6.1 (CHECK-
ING THE FUEL PUMP);
– the injectors are working properly, see 6.5.5 (CHECK-
ING THE INJECTORS);
– the ignition switch is working properly, see 6.8
(SWITCHES);
– the engine shutoff switch is working properly, see 6.8
(SWITCHES);
– the main 20 A fuses and secondary 15 A and 7.5 A
fuses have blown, see 6.18 (CHANGING THE FUS-
ES);
– the battery is working properly, see 2.3 (BATTERY)
and 6.15 (BATTERY);
– the safety logic is working properly, see 6.7 (IGNITION
SAFETY SYSTEM);
– the fall sensor is working properly, see 6.4.4 (CHECK-
ING THE FALL SENSOR).
– injection relay efficiency, see 6.4.3 (CHECKING THE
INJECTION RELAY).
Release 00/2002-02
- 00