Incorrect Voltage Is Supplied To The Ecu - Yamaha 2009 YZF-R1 (Y) Service Manual

Fault code No.
Symptom
Fail-safe action
Diagnostic monitor-
ing code No.
Meter display
Checking method
Item/components and
probable cause
1 Connection of ECU coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
2 Continuity of wire harness
3 Battery malfunction
4 Stator coil malfunction
5 ECU malfunction
46

Incorrect voltage is supplied to the ECU.

Engine startup: Possible
Riding: Possible
—
—
—
Check or maintenance job
Poor connection → Connect
it securely, or repair/replace
the wire harness.
Open or short circuit →
Replace the wire harness.
Between the battery and
main switch
Red–Red
Between the main switch and
ignition fuse
Brown/Blue–Brown/Blue
Between the ignition fuse and
ECU
Red/White–Red/White
Check the battery voltage.
Refer to "CHECKING AND
CHARGING THE BATTERY"
on page 8-125.
Battery malfunction →
Recharge or replace the bat-
tery.
Check the stator coil output.
Refer to "CHECKING THE
STATOR COIL" on page 8-
134.
Stator coil malfunction →
Replace the stator coil.
Replace the ECU.
FUEL INJECTION SYSTEM
8-91
Sensor inspection proce-
dure
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.