aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
05/ 01
INJECTION TROUBLESHOOTING
FUNCTIONAL PHASE
1 - Turn the key to the “ON” position
2 - Does the control LED stay on?
YES
When the start button is pressed, does the engine turn over?
NO
YES
NO
- Make sure the battery is charged
- Check the battery terminals
- Check the 15 A fuse
- Make sure the fuse connector is properly inserted into its
housing
- Check between the 15 A connector and the positive pole
of the battery
- See the SR 50 water-cooled (injection relay) workshop
manual to check the wiring
Replace the bulb
With the key in the “ON” position, is there power (12 Volt)
between the two terminals of the injection control connector
led?
YES
Is there power between the red/
black cables of the led and the
negative pole of the battery?
- Check the continuity between the black
wire and the ECU connector
- Check the ECU. See “ECU CON-
TROL”
- Make sure the led connector and fuse are properly con-
nected.
- Make sure the black wire between the led and CDI connec-
tor is continuous
- Check the general electrical wiring (battery, fuses, main
switch)
NO
NO
YES
Chapter.5
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
3 - After turning the key does the fuel pump run for a
few seconds?
- Make sure the battery is charged
- Check the battery connections
- Check the voltage at the pump connector
ends
Turn to the “OFF” then to the “ON” posi-
tion.
Did the pump work?
NO
NO
YES
YES
TROUBLESHOOTING SHAFT