Yamaha RS90GTZ Service Manual page 355

Fault code No. 44
Diagnostic No. d:60 (EEPROM improper cylinder indication)
Item/components and probable cause
Order
Malfunction in ECU.
1
2 Malfunction in ECU.
Fault code No. 46
Diagnostic code No. d:09 (fuel system voltage)
Item/components and probable cause
Order
Connections
• Wire harness ECU coupler
1
Faulty battery.
2
Malfunction in rectifier/regulator.
3
Open or short circuit in wire harness.
4
5 Malfunction in ECU.
Fault code No. 50
Diagnostic code No. – –
Item/components and probable cause
Order
Malfunction in ECU.
1
FUEL INJECTION SYSTEM
Symptom Error is detected while reading or writing on EEPROM (CO adjustment value).
Check or maintenance job
Execute the diagnostic mode (code No. d:60).
1. Check the faulty cylinder. (If multiple cylinders
are defective, the display alternates every 2 sec-
onds.)
2. Readjust the CO of the displayed cylinder.
Replace ECU if defective.
Replace the ECU.
Symptom Power supply to the ECU is not normal.
Check or maintenance job
Check the coupler for any pins that may have pulled
out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect the
coupler securely.
Replace or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
Replace if defective.
Refer to "CHARGING SYSTEM" in CHAPTER 8.
Repair or replace if there is an open or short circuit.
Between the battery and main fuse coupler.
Red – Red
Between the main fuse coupler and fuse box termi-
nal (ignition fuse).
Red – Red
Between the fuse box terminal (ignition fuse) and
main switch coupler.
Red/Yellow – Red/Yellow
Between the main switch coupler and engine stop
switch coupler.
Brown – Brown
Between the engine stop switch coupler and ECU
coupler.
Red/White – Red/White
Replace the ECU.
Faulty ECU memory. (When this malfunction is detected in the ECU, the fault
Symptom
code number might not appear on the meter.)
Check or maintenance job
Replace the ECU.
7-28
FI
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
on.
Reinstate-
ment method
Starting the
engine and
operating it at
idle.
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
on.