Yamaha RS90GTZ Service Manual page 340

Fault
Symptom
code No.
Malfunction detected in the
primary lead of the cylinder-
#3 ignition coil.
35
Engine speed is high when the
engine is idling.
37
No normal signals are
42 received from the speed
sensor.
Power supply to the fuel
43 injectors and fuel pump is not
normal.
Error is detected while reading
44 or writing on EEPROM (CO
adjustment value).
Power supply to the ECU is
46
not normal.
Faulty ECU memory. (When
this malfunction is detected in
50 the ECU, the fault code
number might not appear on
the meter.)
Conditions requiring T.O.R.S.
operation are detected.
84
Oil pressure switch: open
circuit detected.
85
No signals are received from
the ECU.
Er-1
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Coupler defective between cylinder-#3 ignition coil – ECU.
• Open or short circuit in wire harness.
• Open or short circuit in ignition system sub-wire harness.
• Malfunction in cylinder-#3 ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition system.
• Coupler defective between ISC – ECU.
• Open or short circuit in wire harness.
• Defective speed sensor.
• Malfunction in throttle valve.
• 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.
• Defective fuel injection system relay.
• Malfunction in ECU.
• Malfunction in ECU. (The CO adjustment value is not prop-
erly written on or read from the internal memory.)
• Malfunction in the charging system. (Refer to "CHARGING
SYSTEM" 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 throttle position sensor.
• Defective throttle switch.
• Defective speed sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Coupler defective between switch – ECU.
• Open or short circuit in wire harness.
• Open or short circuit in oil pressure switch sub-lead.
• Defective oil pressure switch.
• Improperly installed oil pressure switch.
• Malfunction in ECU.
• Coupler defective between speedometer unit – ECU.
• Open or short circuit in wire harness.
• Open or short circuit in sub-wire harness 2.
• Malfunction in speedometer unit.
• Malfunction in ECU.
7-13
FI
Diagnostic
code No.
d:32
d:54
d:07
d:09
d:60
—
—
d:01
d:07
d:24
—
—