Yamaha FZS1000N, Service Manual

Page: 375 / 394

8-52
EXUP SYSTEM
ELEC
YES NO
Check that the EXUP
cables are properly
installed.
If the connections are
correct, check the
EXUP valve and
cables. Refer to “EX-
HAUST SYSTEM” in
chapter 5.
EAS00830
Connect the pocket tester (DC 20 V) to the
EXUP servomotor coupler as shown.
2. Voltage
Positive tester probe black / red
Negative tester probe black / yellow
1
2
Set the main switch to “ON”.
Measure the voltage (12 V) between
black / red
and black / yellow .
YES NO
Go to Procedure 2.
Is the voltage within specification?
1 2
Disconnect the EXUP cables at the EXUP
servomotor pulley side.
Start the engine and rev it to 5,000 r / min.
1. EXUP servomotor operation (with the
EXUP servomotor coupler connected to
the wire harness)
Does the EXUP servomotor pulley turn?
Procedure 1
EAS00829
NOTE:
EAS00828
TROUBLESHOOTING
When the engine speed changes, the
EXUP servomotor does not operate.
Procedure 1
Check:
1. EXUP servomotor operation
(with the EXUP servomotor coupler con-
nected to the wire harness)
2. Voltage
3. EXUP servomotor operation
(with the EXUP servomotor coupler discon-
nected from the wire harness)
4. EXUP servomotor resistance
(potentiometer resistance)
5. Wiring connections
(the entire EXUP system)
Procedure 2
Check:
1. Main and turn signal fuses
2. Battery
3. Main switch
4. Neutral switch
5. Engine stop switch
6. Wiring connections
(the entire EXUP system)
Before troubleshooting, remove the following
part(s):
1) Seat
2) Fuel tank
Troubleshoot with the following special tool(s).
Pocket tester measurement
YU-03112-C