Yamaha 2005 MT-01, Service Manual

Page: 375 / 435

FUEL INJECTION SYSTEM
7-60
Fault code No. 43 Symptom The ECU is unable to monitor the battery voltage (an open
or short circuit in the line to the ECU).
Diagnostic code No. 09 Fuel system voltage
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Connections
• Relay unit coupler (fuel pump relay)
• 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
securely.
Starting the
engine and
operating it at
idle.
2 Open or short circuit in the wire
harness. • Repair or replace if there is an
open or short circuit.
• Between fuel pump relay
coupler and ECU coupler.
(blue/red–blue/red)
(red/blue–red/blue)
• Between fuel pump relay
coupler and battery terminal.
(red–red)
• Between fuel pump relay
coupler and engine stop switch
coupler.
(black/red–black/red)
3 Malfunction or open circuit in fuel
pump relay. • Execute the diagnostic mode.
(Code No. 09)
• Replace if defective.
• If there is no malfunction with
the fuel pump relay, replace the
ECU.
Fault code No. 44 Symptom Error is detected while reading or writing on EEPROM (CO
adjustment value).
Diagnostic code No. 60 EEPROM improper cylinder indication
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Malfunction in ECU. • Execute the diagnostic mode.
(Code No. 60)
1. Check the faulty cylinder. (If
multiple cylinders are
defective, the number of the
faulty cylinders appears
alternately at 2-second
intervals.)
• Replace ECU if defective.
Turning the
main switch to
“ON”.