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FI
FUEL INJECTION SYSTEM
Code No. 42 Symptom 1 No normal signals are received from the speed sensor.
2 Open or short circuit is detected in the neutral switch.
Used diagnostic code No. 07 (speed sensor)
No. 21 (neutral switch)
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
1 Defective speed sensor Replace if defective.
Refer to “FUEL INJECTION SYSTEM” in
chapter 8.
Reinstated by
starting the engine,
and inputting the
vehicle speed sig-
nals by operating
the motorcycle at a
low speed of 20 to
30 km/h.
1 Open or short circuit in lead wire.
1 Gear for detecting vehicle speed has bro-
ken.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Blue - Blue
White/Yellow - White/Yellow
Black/Blue - Black/Blue
Replace if defective.
Refer to “TRANSMISSION” in chapter 5.
1 Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Speed sensor coupler
Main wiring harness ECU coupler
2 Defective neutral switch Replace if defective.
Refer to “CHECKING THE SWITCHES” in
chapter 8.
2 Faulty shift drum
(neutral detection area)
Replace if defective.
Refer to “TRANSMISSION” in chapter 5.
2 Open or short circuit in lead wire Repair or replace if there is an open or short
circuit.
Main wiring harness
Sky blue/Sky blue
2 Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Neutral switch coupler
Main wiring harness ECU coupler
Code No. 43 Symptom The ECU is unable to monitor the battery voltage.
Used diagnostic code No. 50 (fuel injection system relay)
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
Malfunction in ECU Fuel injection system relay is on. Reinstated by
starting the engine
and operating it at
idle.
Open or short circuit in the wiring harness. Repair or replace if there is an open or short
circuit.
Main wiring harness
Red - Red
Red/Black - Red/Black
Red/Blue - Red/Blue
Blue/Yellow - Blue/Yellow
Malfunction or open circuit in fuel injection sys-
tem relay
Replace if defective.
Refer to “FUEL INJECTION SYSTEM” in
chapter 8.
If there is no malfunction with the fuel injection
system relay, replace the ECU.
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Fuel injection system relay coupler
ECU coupler