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aprilia
Air-injection 50 cc
Release 00 / 2002 - 09
INJECTION TROUBLESHOOTING
05 / 09
Chapter.5
FLASHING NUMBER
DESCRIPTION OF FAULTS
FAULT PRIORITY
ENGINE CHECK
POSSIBLE CAUSE
CHECKS AND REMEDIES
1
Overheated engine
1
-
Damaged thermostat
Damaged radiator
Check thermostat
Check radiator
Check hose
Damaged hose
2
Fault in the phonic wheel
2
-
Damaged pickup wires
Connectors
Check the continuity (R=0 Ohm) between the trans-
ducer and ECU (blue wire – white wire - blue/yellow
wire –white/yellow wire). Check opening of the circuit
(R=infinite) between the pickup and earth
Check connectors
Check resistance (R=385 +/- 20% Ohm) between the
positive and negative poles of the pickup
Transducers
Inverted pickup wires
Check wiring
Twin error of alignment, throttle sensor (TPS)
Inverted throttle sensor connector wires
Connectors
Damaged wires
Damaged throttle sensor
Error of alignment, primary throttle sensor (TPS)
Error of alignment, secondary throttle sensor
(TPS)
3
2
-
Throttle wire improperly set (on the handlebar)
Adjust throttle cable
Check connectors
Check continuity (R=0 Ohm) between the sensor and
ECU (yellow/brown wire - pink wire - white wire - yellow
wire)
Throttle control sealing screw out of place
Check the end screw (which shouldn’t be tampered
with)
4
5
Check connector wires
Replace throttle body
Primary throttle sensor (TPS) fault
Damaged wires
Sensor races worn
Water in the sensor
Damaged throttle sensor
Secondary throttle sensor (TPS) fault
Twin fault, throttle sensor (TPS)
6
-
Connectors
Check connectors
Replace throttle body
Remove traces of water and try again. If necessary,
replace the butterfly casing.
Inverted throttle sensor wiring
Check sensor wiring
7
8
Check the continuity (R=0 Ohm) between the sensor
and ECU (brown/yellow wire - pink wire - white wire -
yellow wire)
Replace throttle body
2
2
Set ticking over speed
1
TABLE OF FAULT CODES
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)