Yamaha YZF-R1 2020 Service Manual page 769

EAS20650
U0155 or Err (SCU)
EAS33130
TROUBLESHOOTING
Item
Abnormal CAN communication (between meter assembly and SCU)
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
1. Connection of meter assembly coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 2.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "OFF" and back to "ON", and then check the condition of the DTC using the
malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Service is completed.
NO
→ Go to step 2.
2. Wire harness continuity.
• Disconnect the SCU coupler "1", joint coupler "2" and meter assembly coupler "3".
• Open circuit check
Between SCU coupler and joint coupler
Between the joint coupler and meter assembly cou-
pler
blue/white–blue/white
blue/black–blue/black
blue/white–blue/white
blue/black–blue/black
9-274
U0155 or Err (SCU)