Yamaha XV16AL, Service Manual

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ELEC
SELF-DIAGNOSIS
EB812000
SELF-DIAGNOSIS
The XV16AL/XV16ALC/XV16ATL/XV16ATLC features a self-diagnosing system for the follow-
ing circuit(s):
• throttle position sensor
• speed sensor
• decompression solenoid
• fuel level meter
If any of these circuits is defective, the respective condition code will be displayed by the
engine trouble indicator light or fuel level indicator light when the main switch is set to “ON”
(irrespective of whether the engine is running or not).
NOTE:
When the main switch is turned on, the engine trouble indicator light and fuel level indicator
light in the meter assembly normally come on for 1.4 seconds and then go off. However, if
there is a malfunction, the corresponding indicator light then begins flashing when the
engine is stopped or comes on when the engine is running.
Indica-
tor light
Circuit Defect(s) System response
Condition code
When
engine is
stopped
When
engine is
running
Throttle posi-
tion sensor • Disconnected
• Short-circuit
• Locked
• The ignitor unit stays set to the
wide-open throttle ignition tim-
ing. The motorcycle can be rid-
den.
• The engine trouble indicator
light displays the condition code.
Blinks in
patterns
of 3 Lights up
Speed sensor • Abnormal pulse
• Disconnected
• Short-circuit
• The engine speed limiter sets in
approximately 4,400 rpm.
• The engine trouble indicator
light displays the condition code.
Blinks in
patterns
of 4 Lights up
Decompres-
sion solenoid • Disconnected
• Short-circuit
• Over heated
solenoid
• Disconnected
thermistor in
solenoid
• Short-circuited
thermistor in
solenoid
• The decompression solenoid
does not move.
• The starter motor does not oper-
ate.
• The engine trouble indicator
light displays the condition code.
Blinks in
patterns
of 6 Lights up
Fuel level
meter • Disconnected
• Short-circuit
• The fuel level meter displays the
empty position.
• The fuel level indicator light dis-
plays the condition code.
Blinks in
patterns
of 8 Blinks in
patterns
of 8
7