aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
9
Inadequate battery voltage or ECU disconnected
Low voltage
Battery voltage too low
Red/brown wire connector 15 wire to the ECU not con-
nected or connected to earth
Check the battery charge. Check and restore battery
connections if necessary.
Check the wires/connectors (see SR 50 WATER HAND-
BOOK)
Voltage regulation wires and/or connectors not wired
up
05 / 10
Chapter.5
Wires and/or connectors of the injector system relay
not connected
Magnet flywheel
Check connectors. Fit the relay between the blue wire
and red/black wire. If the relay closes, check the conti-
nuity (R=0 Ohm) between the red/brown wire and or-
ange wire. If the values are correct: check the general
feed plant (battery, fuse, main switch).
Check the magnet flywheel (see SR 50 WATER HAND-
BOOK)
Check the continuity (R=0 Ohm) of the red/brown wire.
10
Faulty oil pump
Connectors
Damaged wires
Check connectors
Check the resistance value of the oil pump (26.3 Ohm
at 25°C) between the positive and negative pole.
Pompa dell'olio danneggiata
Damaged ECU
See ECU CONTROL
Check the continuity (R=0 Ohm) of the brown wire be-
tween the pump and ECU. Check the voltage (12V)
between the red/black wire and negative battery pole.
Control the general electrical feed plant (battery, fuse,
main switch)
11
Air injector fault
Connectors
Damaged wires
Check connectors
Check the resistance inside the air injector between
the negative and positive poles (R= 1.3 Ohm)
Damaged air injector
Damaged injection plant relay
Damaged ECU
Check connectors. Fit the relay between the red and
blue wire. If the relay closes check the continuity (R=0
Ohm) between the red/brown wire and the orange wire.
If values are correct: check the general feed circuit (bat-
tery, fuse, main switch).
See ECU CONTROL
Check the continuity (R=0 Ohm) of the white/red wire
between the air injector and ECU. Check the voltage
(12V) between the red/black wire and the negative pole
of the battery.
1
-
1
-
2
-
FLASHING NUMBER
DESCRIPTION OF FAULTS
FAULT PRIORITY
ENGINE CHECK
POSSIBLE CAUSE
CHECKS AND REMEDIES
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)