Yamaha RS90GTZ Service Manual page 357

Fault code No. 85
Diagnostic code No. – –
Item/components and probable cause
Order
Connections
• Oil pressure switch coupler
1 • Wire harness ECU coupler
• Oil pressure switch sub-lead coupler
Open circuit in wire harness and/or oil
pressure switch sub-lead.
2
Defective oil pressure switch.
3
4 Malfunction in ECU.
Er-1
Er-2
Fault code No.
Er-3
Er-4
Diagnostic code No. – –
Item/components and probable cause
Order
Connections
• Wire harness ECU coupler
1 • Headlight sub-wire harness coupler
Open or short circuit in wire harness and/
or headlight sub-wire harness.
2
3 Malfunction in speedometer unit.
4 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Oil pressure switch: open circuit detected.
Check or maintenance job
Check the couplers for any pins that may have
pulled out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Repair or replace if there is an open circuit.
Between the oil pressure switch coupler and ECU
coupler.
Yellow/Green – Yellow/Green
With the engine stopped, check that there is conti-
nuity between the oil pressure switch terminals and
oil pressure switch body metal components or
engine ground.
Replace if there is no continuity.
Refer to "OIL PRESSURE SWITCH".
Replace the ECU.
Symptom No signals are received from the ECU.
Symptom No signals are received from the ECU within the specified signal time.
Symptom Data from the ECU cannot be received correctly.
Symptom Non-registered data has been received from the meter.
Check or maintenance job
Check the coupler for any pins that may have pulled
out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Repair or replace if there is an open or short circuit.
Between speedometer unit coupler and ECU cou-
pler.
Blue/Yellow – Blue/Yellow
Replace the speedometer unit.
Replace the ECU.
7-30
FI
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.