Yamaha VMAX 2009 Service Manual page 480

Fault code No.
Item
2 Open or short circuit in wire harness.
3 Defective EXUP servo motor (potentiom-
eter circuit).
Reinstatement method
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuator operation
Checking method
Probable cause of malfunction
1 Connections
• EXUP servo motor coupler
• Wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective EXUP servo motor.
4 Defective EXUP valve, pulley, and ca-
bles.
Reinstatement method
17
EXUP servo motor circuit: open or short circuit detected.
• Repair or replace if there is an open or short
circuit.
• Between EXUP servo motor coupler and ECU
coupler.
(blue–blue)
(white/red–white/red)
(black/blue–black/blue)
• Execute the diagnostic mode. (Code No. D:53)
• Replace if defective.
Reinstated automatically if a normal signal is received.
18
EXUP servo motor: stuck EXUP servo motor is detected.
Able to start engine
Able to drive vehicle
D:53
Actuates the EXUP servo motor (turns to open side and to closed
side).
Illuminates the engine trouble warning light.
Check the operating sound.
• Check the coupler for any pins that may be
pulled out.
• Check the locking condition of the couplers.
• If there is a malfunction, repair it and connect
the coupler securely.
• Repair or replace if there is an open or short
circuit.
• Between EXUP servo motor coupler and ECU
coupler.
(black/white–black/white)
(black/red–black/red)
• Execute the diagnostic mode. (Code No. D:53)
• Replace if defective.
• Replace if defective.
Turning the main switch to "ON".
It takes 3 seconds at the maximum before the original state re-
turns.
8-47
FUEL INJECTION SYSTEM
Check or maintenance job