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FLASHING NUMBER
DESCRIPTION OF FAULTS
15
Rev limit switch triggered
Fault to sensor feed circuit
16
ECU Low voltage
Variator threshold exceeded
17
Temperature sensor fault (feed with current too
18
low) -
Temperature sensor fault (feed with current too
19
high) -
Cooling liquid temperature fault
20
Injection system – faulty bulb
21
ECU Low voltage sensor feed circuit fault
22
Check continuity (R=0 Ohm) between the blue wire (PIN no. 1) and the battery negative
1
2
Check voltage (12V) between the red/brown wire (PIN no. 15) and battery negative
aprilia
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
FAULT PRIORITY
ENGINE CHECK
2
Maximum speed limit
Led for rev limit switch (if on, does not indicate a fault)
3
-
Damaged ECU
High revs on start-up
3
Rev limit
Connectors
3
-
Damaged wires
Damaged temperature sensor
3
-
Damaged ECU
Connectors
-
3
Temperature reader wires
Damaged temperature reader
Damaged ECU
3
-
Can be read using external control instruments
2
Set ticking over speed
Damaged ECU
CONTROL ECU
POSSIBLE CAUSE
3
Check the voltage (12V) between the red/black wire (PIN no. 17) and battery negative
4
Replace the ECU with one that functions properly.
CHECKS AND REMEDIES
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.
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
See ECU CONTROL
Check the connection between the temperature sen-
sor and dashboard connection.
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.
Replace the temperature reader
See ECU CONTROL
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
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