Yamaha XV19SX(C), Service Manual

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FUEL INJECTION SYSTEM
7-59
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 se-
curely.
Starting the en-
gine and oper-
ating it at idle.
2 Open or short circuit in the wire har-
ness. • Repair or replace if there is an
open or short circuit.
• Between relay unit coupler (fuel
pump relay) and ECU coupler.
(blue/red–blue/red)
(red/blue–red/blue)
• Between relay unit coupler (fuel
pump relay) and battery termi-
nal.
(red–red)
• Between relay unit coupler (fuel
pump relay) and diode 2 cou-
pler. (for XV19S(C)/ XV19M(C)/
XV19CTS(C)/ XV19CTM(C))
(red/white–red/white)
• Between diode 2 coupler and
engine stop switch coupler. (for
XV19S(C)/ XV19M(C)/
XV19CTS(C)/ XV19CTM(C))
(black/red–black/red)
3 Malfunction or open circuit in relay
unit (fuel pump relay). • Execute the diagnostic mode.
(Code No. 09)
• Replace if defective.
• If there is no malfunction with
the relay unit (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 defec-
tive, the number of the faulty
cylinders appears alternate-
ly at 2-second intervals.)
• Replace ECU if defective.
Turning the
main switch to
“ON”.