Yamaha FX10X 2008, Service Manual

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7-20
FI
FUEL INJECTION SYSTEM
Fault code No. 35 Symptom Malfunction detected in the primary lead of the cylinder-#3 ignition coil.
Diagnostic code No. 32 (cylinder-#3 ignition coil)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Connections
Cylinder-#3 ignition coil coupler
Wire harness ECU couplers
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 or short circuit in wire harness. Repair or replace if there is an open or short cir-
cuit.
Between the cylinder-#3 ignition coil coupler and
ECU couplers.
Orange/Green – Orange/Green
Red/White – Red/White
3 Detective cylinder-#3 ignition coil. Execute the diagnostic mode (code No. 32).
Test the primary and secondary coils for continu-
ity.
Replace if defective.
Refer to “IGNITION SYSTEM” in CHAPTER 8.
Fault code No. 37 Symptom Engine speed is high when the engine is idling.
Diagnostic code No. 54 (ISC (idle speed control) unit)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Throttle valve does not fully close. Check the throttle body.
Refer to “THROTTLE BODY”.
Check the throttle cable.
Refer to “THROTTLE CABLE FREE PLAY
ADJUSTMENT” in CHAPTER 2. ISC valve returns to
its original position
by setting the
engine stop switch
to “RUN” and turn-
ing the main switch
on and off.
Reinstated if the
engine idle speed is
within specification
after starting the
engine.
2 ISC valve is stuck fully open due to discon-
nected ISC unit 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.) Check that the ISC unit coupler is not dis-
connected.
The ISC valve is stuck fully open if it does
not operate when turning the main switch
off.
(Touch the ISC unit with your hand and
check if it is vibrating to confirm if the ISC
valve is operating.)
NOTE:
Do not remove the ISC unit.
3 ISC valve is not moving correctly. Execute the diagnostic mode (code
No. 54).
After the ISC valve is fully closed, it opens
to the standby opening position. This oper-
ation takes approximately 12 seconds.
Start the engine. If the error recurs,
replace the throttle body assembly.