Yamaha FX10X Service Manual page 583

Fault
Symptom
code No.
Engine speed is high when
37
the engine is idling.
No normal signals are
42 received from the speed sen-
sor.
Power supply to the fuel
43 injectors and fuel pump is not
normal.
Error is detected while read-
44 ing or writing on EEPROM
(CO adjustment value).
Power supply to the fuel
46 injection system is not nor-
mal.
Faulty ECU memory. (When
this malfunction is detected in
50 the ECU, the fault code num-
ber might not appear on the
meter.)
Grip warmer: open or short
81 circuit detected.
Thumb warmer: short circuit
83 detected.
Conditions requiring T.O.R.S.
operation are detected.
84
Oil pressure switch: open cir-
cuit detected.
85
No signals are received from
the ECU.
Er-1
No signals are received from
Er-2 the ECU within the specified
signal time.
Data from the ECU cannot be
Er-3 received correctly.
Non-registered data has been
Er-4 received from the meter.
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Malfunction in throttle body.
• Malfunction in throttle cable.
• ISC valve is stuck fully open due to disconnected ISC unit hose
or coupler. (High engine idle speed is detected with the ISC
valve stuck fully open even though signals for the valve to close
are continuously being transmitted by the ECU.)
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective speed sensor.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in ECU.
• Malfunction in ECU. (The CO adjustment value is not properly
written on or read from the internal memory.)
• Malfunction in the charging system. (Refer to "CHARGING SYS-
TEM" in CHAPTER 8.)
• Malfunction in ECU. (The program and data are not properly
written on or read from the internal memory.)
• Open or short circuit in wire harness.
• Defective grip warmer.
• Malfunction in ECU.
• Short circuit in wire harness.
• Defective thumb warmer.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Defective throttle position sensor.
• Defective throttle switch.
• Defective speed sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Open circuit in wire harness.
• Open circuit in oil pressure switch sub-lead.
• Defective oil pressure switch.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Defective wire connection of the ECU coupler.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
7-9
FI
Diagnostic code No.
54
07
09
60
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26
27
01
07
24
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