Yamaha RST90GTY, Service Manual

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69
FI
FUEL INJECTION SYSTEM
Fault code No. 81 Symptom Grip warmer: open or short circuit detected.
Diagnostic code No. d:57 (grip warmer operation)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Open or short circuit in wire harness. Repair or replace if there is an open or short cir-
cuit.
Between the grip warmer coupler and ECU cou-
pler.
Yellow/Red-Yellow/Red
Setting the
engine stop
switch to “RUN”
and turning the
main switch on.
Fault code No. 83 Symptom Thumb warmer: short circuit detected.
Diagnostic code No. d:27 (thumb warmer operation)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Short circuit in wire harness. Repair or replace if there is a short circuit.
Between the thumb warmer coupler and ECU
coupler.
Light green-Light green
Setting the
engine stop
switch to “RUN”
and turning the
main switch on.
Fault code No. 85 Symptom Oil pressure switch: open circuit detected.
Diagnostic code No. – –
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Connections
• Oil pressure switch coupler
• Wire harness ECU coupler
• Oil pressure switch sub-lead coupler
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. Starting the
engine and
operating it at
idle.
2 Open circuit in wire harness and/or oil
pressure switch sub-lead. Repair or replace if there is an open circuit.
Between the oil pressure switch coupler and ECU
coupler.
Yellow/Green – Yellow/Green
3 Defective oil pressure switch. With the engine stopped, check that there is con-
tinuity 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”.