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