Yamaha YZF-R15, Service Manual

Page: 306 / 338

8-49
FUEL INJECTION SYSTEM
Fault code No. 44 Symptom Error is detected while reading from or writing on
EEPROM (CO adjustment value, code re-registering key
code, and throttle valve fully closed notification value).
Diagnostic code No. 60 EEPROM fault code display
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Malfunction in ECU. • Execute the diagnostic mode.
(Code No.60).
• 01 is displayed.
Adjust the exhaust gas volume
(refer to page no. 3-5)
Replace ECU if defective.
Turning the
main switch to
“ON”.
Fault code No. 46 Symptom Power supply to the fuel injection system is not normal.
Diagnostic code No. — —
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Connections
• Main wire harness ECU coupler • Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
Starting the en-
gine and oper-
ating it at idle.
2 Faulty battery. • Replace or change the battery
Refer to “CHECKING AND
CHARGING THE BATTERY ” on
page 8-61.
3 Malfunction in rectifier/regulator • Replace if defective.
Refer to “CHARGING SYS-
TEM” on page 8-11.
4 Open or short circuit in wire harness. Repair or replace if there is an
open or short circuit.
• Between battery and main
switch
(red–red)
• Between main switch and ECU
(brown–brown)
Fault code No. 50 Symptom Faulty ECU memory. (When this malfunction is detected in
the ECU, the fault code number might not appear on the
meter.)
Diagnostic code No. — —
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Malfunction in ECU. Replace the ECU.
NOTE:
Do not perform this procedure
with the main switch turned to
“ON”.
Turning the
main switch to
“ON”.
8-50
FUEL INJECTION SYSTEM
Fault code No. 42 Symptom No normal signals are received from the speed sensor.
Diagnostic code No. 07 Speed sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1
2
3
4
Connections
Open or short circuit in lead.
Defective speed sensor.
Installed state of speed sensor.
•
• Speed sensor coupler
Main wire harness ECU coupler
Check for looseness or pinching.
• Check the couplers for any pins
that may be pulled out.
•
•
•
•
•
•
Check the locking condition of
If there is a malfunction, repair it
Repair or replace if there is an
Execute the diagnostic mode.
Replace if defective.
Refer to “CHECKING THE
SPEED SENSOR” on page 8-74
(Code No. 07)
Between speed sensor coupler
and ECU coupler.
open or short circuit.
and connect the coupler
securely.
the couplers.
Starting the
engine, and
activating the
speed sensor
by operating the
vehicle.