Yamaha YZF-R6 99, Service Manual

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8-44
Does the startup display appear first and then
after approximately three seconds the normal
display appears?
First, connect the battery to the green / yellow
and black / blue coupler terminals, then
connect the battery positive lead to the
red / green
terminal.
When connecting the battery, check whether
the startup display 3 appears first and then af-
ter approximately three seconds the normal
display appears 4.
Battery positive lead green / yellow
Battery negative lead black /blue
Battery positive lead red
1
2
1. Speedometer bulb socket
Check the speedometer bulb socket for con-
tinuity.
Is the speedometer bulb socket OK?
NO YES
Replace the speedometer bulb
socket.
2. Voltage
Connect the pocket tester (20 V DC) to the
speedometer coupler (wire harness side) as
shown.
3
NOTE:
1 2
3
NO YES
Replace the speedometer.
Tester positive probe blue
Tester negative probe blue / black
1
2
3. Voltage
Connect the pocket tester (20 V DC) to the
speedometer bulb socket coupler (wire har-
ness side) as shown.
NO YES
Set the main switch to “ON”.
Measure the voltage (12 V) of blue on the
speedometer bulb socket coupler (wire har-
ness side).
Is the voltage within specification?
The wiring circuit from the main
switch to the speedometer bulb
socket coupler (wire harness
side) is faulty, repair it.
1
4. Speedometer sensor
Connect the pocket tester (20 V DC) to the
speedometer coupler (wire harness side) as
shown.
Tester positive probe blue / yellow
Tester negative probe black / blue
1
Set the main switch to “ON”.
Elevate the rear wheel and slowly rotate it.
Measure the voltage (5 V) of blue / yellow and
black / blue. With each full rotation of the rear
wheel, the voltage reading should cycle from
0 V to 5 V to 0 V to 5 V.
Does the voltage reading cycle correctly?
YES
Replace the speedom-
eter sensor.
NO
This circuit is OK.
2
SIGNALING SYSTEM
ELEC
EAS00806
The speedometer fails to come on.