Yamaha FX10X 2008, Service Manual

Page: 286 / 411

7-10
FI
FUEL INJECTION SYSTEM
37
Engine speed is high when
the engine is idling.
• 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.
54
42
No normal signals are
received from the speed sen-
sor. • Open or short circuit in wire harness.
• Defective speed sensor.
• Malfunction in ECU.
07
43
Power supply to the fuel
injectors and fuel pump is not
normal.
• Open or short circuit in wire harness.
• Malfunction in ECU.
09
44
Error is detected while read-
ing or writing on EEPROM
(CO adjustment value).
• Malfunction in ECU. (The CO adjustment value is not properly
written on or read from the internal memory.)
60
46
Power supply to the fuel
injection system is not nor-
mal.
• Malfunction in the charging system. (Refer to “CHARGING SYSTEM” in
CHAPTER 8.)
—
50
Faulty ECU memory. (When
this malfunction is detected in
the ECU, the fault code num-
ber might not appear on the
meter.)
• Malfunction in ECU. (The program and data are not properly
written on or read from the internal memory.)
—
81
Grip warmer: open or short
circuit detected. • Open or short circuit in wire harness.
• Defective grip warmer.
• Malfunction in ECU.
26
83
Thumb warmer: short circuit
detected. • Short circuit in wire harness.
• Defective thumb warmer.
• Malfunction in ECU.
27
84
Conditions requiring T.O.R.S.
operation are detected. • 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.
01
07
24
85
Oil pressure switch: open cir-
cuit detected. • Open circuit in wire harness.
• Open circuit in oil pressure switch sub-lead.
• Defective oil pressure switch.
• Malfunction in ECU.
—
Er-1
No signals are received from
the ECU. • Open or short circuit in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Defective wire connection of the ECU coupler.
—
Er-2
No signals are received from
the ECU within the specified
signal time. • Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
—
Er-3
Data from the ECU cannot be
received correctly. • Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
—
Er-4
Non-registered data has been
received from the meter. • Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
—
Fault
code No.
Symptom Probable cause of malfunction Diagnostic code No.