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Yamaha MT-09 2021 - Page 638

Yamaha MT-09 2021
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9-208
P0638
6. Malfunction in ECU.
Replace the ECU, and complete the service.
Refer to “REPLACING THE ECU (Engine Control Unit)” on page 8-56.
7. Delete the DTC and check that the MIL goes off.
Confirm that the DTC has a condition of “Recovered” using the YDT, and then delete the DTC.
Is check result OK?
YES
Go to step 6.
NO
a. Replace the throttle bodies.
Refer to “REPLACING THE THROTTLE BODIES” on page 7-9.
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 7, and complete the service.
NO
Go to step 6.

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