Yamaha Vmax VMX17C 2009 Service Manual page 493

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Checking method
Probable cause of malfunction
Connections
• Gear position switch coupler
1 • Wire harness ECU coupler
• Relay unit coupler
B
Open or short circuit in wire harness.
2
Faulty shift drum (neutral detection area). • Replace if defective.
3
Defective gear position switch (neutral
circuit).
4
Reinstatement method
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Checking method
42
Rear wheel sensor: no normal signals are received from the
A
rear wheel sensor.
Gear position switch: open or short circuit is detected in
B
the neutral circuit of the gear position switch.
Able to start engine
Able to drive vehicle
D:21
Gear position switch
• ON (neutral)
• OFF (in gear)
Shift the transmission.
• Check the coupler for any pins that may be
pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect
the coupler securely.
• Repair or replace if there is an open or short
circuit.
• Between gear position switch coupler and re-
lay unit coupler.
(sky blue–sky blue)
• Between relay unit coupler and ECU coupler.
(black/yellow–black/yellow)
Refer to "TRANSMISSION" on page 5-98.
• Execute the diagnostic mode. (Code No. D:21)
• Replace if defective.
Refer to "CHECKING THE SWITCHES" on
page 8-121.
Starting the engine, and inputting the vehicle speed signals by op-
erating the vehicle at a 20 to 30 km/h.
43
Fuel system voltage: the ECU is unable to monitor the battery
voltage (an open or short circuit in the line to the ECU).
Able to start engine
Able to drive vehicle
D:09
Approximately 12.0
Set the engine stop switch to "
tually measured battery voltage. (If the battery voltage is lower,
perform recharging.)
8-60
FUEL INJECTION SYSTEM
Check or maintenance job
", and then compare with the ac-