Yamaha YZF-R1 Series Service Manual page 756

EAS20649
U0155 or Err (FI)
EAS33129
TROUBLESHOOTING
Item
Multi-function meter: signals cannot be transmitted between the ECU and the multi-function meter.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
TIP
"Err" is displayed on the clock display of the multi-function meter, but the MIL does not come on.
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 "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 6, and complete the service.
NO
→ Go to step 2.
2. Connection of ECU 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 3.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 6, and complete the service.
NO
→ Go to step 3.
3. Wire harness continuity.
• Disconnect the meter assembly coupler "1", joint coupler "2" and ECU coupler "3".
• Open circuit check
9-259
U0155 or Err (FI)