aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
05 / 12
Chapter.5
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
15
Maximum speed limit
2
16
-
3
17
Rev limit
3
18
-
3
19
-
3
20
3
-
21
-
3
22
Set ticking over speed
2
CONTROL ECU
1
2
3
4
Check continuity (R=0 Ohm) between the blue wire (PIN no. 1) and the battery negative
Check voltage (12V) between the red/brown wire (PIN no. 15) and battery negative
Check the voltage (12V) between the red/black wire (PIN no. 17) and battery negative
Replace the ECU with one that functions properly.
FLASHING NUMBER
DESCRIPTION OF FAULTS
FAULT PRIORITY
POSSIBLE CAUSE
CHECKS AND REMEDIES
Rev limit switch triggered
Fault to sensor feed circuit
ECU Low voltage
Variator threshold exceeded
Temperature sensor fault (feed with current too
low) -
Temperature sensor fault (feed with current too
high) -
Cooling liquid temperature fault
Injection system – faulty bulb
ECU Low voltage sensor feed circuit fault
Led for rev limit switch (if on, does not indicate a fault)
Damaged ECU
High revs on start-up
Connectors
Damaged wires
Damaged temperature sensor
Damaged ECU
Damaged temperature reader
Damaged ECU
Temperature reader wires
Connectors
Can be read using external control instruments
Damaged ECU
See ECU CONTROL
Examine the cause of the high revs at start-up
Check connectors
Check the continuity (R=0 Ohm) of the pink wire be-
tween the sensor and ECU, and of the green/red wire
between the sensor and ECU.
See ECU CONTROL
Check the resistance of the temperature sensor:
21430 - 24750 Ohm at 15 °C / 2613 - 2795 Ohm at 25
°C / 99.9 – 106.9 Ohm at 120 °C
Check the voltage (12V) between the green/red wire
and negative pole of the battery. Check the continuity
(R=0 Ohm) of the white/blue wire between the tempera-
ture reader and ECU. Check the continuity (R=0 Ohm)
of the pink wire between the temperature sensor and
ECU and of the green/red wire between the tempera-
ture reader and ECU.
See ECU CONTROL
Check the connection between the temperature sen-
sor and dashboard connection.
Replace the temperature reader
Check the voltage (12V) between the two terminals of
the injection control led connector. If the voltage is nor-
mal: replace the injector control led. If there is no volt-
age reading: check the led connector and/or red/black
wire between the led and ECU.
See ECU CONTROL
ENGINE CHECK