ECU Communication Line Inspection
When the data is not sent from the ECU to the meter unit for more than about 10 seconds, the service code 39 is displayed.
The data is sent through the CAN communication line.
The service code 39 is detected with the meter unit.
When the user mode, this communication error blinks the following items besides the FI warning symbol [A].
Power Mode and S-KTRC Symbols [B] Yellow Color LED [C]

If the CAN communication line resistance is normal, check the wiring according following procedure.
Disconnect the ECU and meter unit connectors.
Special Tool - Hand Tester: 57001-1394
Wiring Inspection ECU Connector [A] ←→ Meter Unit Connector [B] GY/BL lead (ECU terminal 27) [C] LB lead (ECU terminal 28) [D]

ECU Communication Line Circuit

1. ECU
2. Joint Connector D
3. Joint Connector C
4. Meter Unit
5. Warning Indicator Light (LED, Yellow)
6. Warning Indicator Light (LED, Red)
Blank Key Detection (Service Code 36, Equipped Models)Thermostat Inspection
Remove the thermostat (see Thermostat Removal).
Inspect the thermostat valve [A] at room temperature.
If the valve is open, replace the thermostat with a new
one.
To check valve opening temperature, suspend the thermostat
[A] in a container of water and raise the temperature
of ...
Front, Rear Wheel Rotation Difference Abnormal Inspection (Service Code b
25)
Check the following and correct the faulty part.
Incorrect Tire Pressure
Tires not recommended for the motorcycle were installed
(incorrect tire size).
Deformation of Wheel or Tire
Missing Teeth or Clogging with Foreign Matter of Sensor
Rotor (see Wheel Rotation Sensor Rotor Inspe ...
Air Suction Valve Installation
Install the air suction valve so that opening [A] of the reed
faces downward.
Apply a non-permanent locking agent to the threads of
the air suction valve cover bolts [A], and tighten them.
Torque - Air Suction Valve Cover Bolts: 9.8 N·m (1.0 kgf·m,
87 in·lb)
...