Yamaha YZF-R1(B) 2012 Service Manual page 486

Fault code No.
Symptom
Fail-safe action
Diagnostic monitor-
ing code No.
Meter display
Checking method
Item/components and
probable cause
2 Connection of main harness
ECU coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
3 Continuity of wire harness
between the battery, relay
unit, ECU and fuel injectors
coupler
4 Fuel injection system relay
malfunction
5 ECU malfunction
43
Incorrect voltage supplied to the fuel injector and fuel pump
Engine startup: Possible
Riding: Possible
D:50
Approximately 12.0
Set the engine stop switch to "
ally measured battery voltage. (If the battery voltage is lower, per-
form recharging.)
Check or maintenance job
Poor connection → Connect
it securely, or repair/replace
the wire harness.
Open or short circuit →
Replace the wire harness.
Red–Red
Red/Blue–Red/Blue
Check in the diagnostic mode
(Code No. 50).
No operation sound of fuel
injection system relay is
heard. → Replace the relay
unit.
Replace the ECU.
FUEL INJECTION SYSTEM
", and then compare with the actu-
8-89
Sensor inspection proce-
dure
Start and idle the engine for
approximately 30 seconds.
Then, check the fault code
indication.
No fault indicated. → Recov-
ered.
Fault code indicated. →
Check the next step.
Start and idle the engine for
approximately 30 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 30 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.