Yamaha MBK X-MAX 300 2017 Service Manual page 423

SMART KEY SYSTEM SELF-DIAGNOSIS
If a communication error between the ECU and the smart key unit is detected, the following fault code
numbers will be displayed on the meter to indicate the location of the malfunction.
TIP
These fault code numbers are not stored in the memory of the ECU. Note all of the displayed fault code
numbers, and then check the vehicle.
Device that de-
Fault code
tected the mal-
No.
function
51 Smart key unit
53 Smart key unit
54 Smart key unit
56 ECU
Symptom
Communication error
between the smart key
and the smart key unit.
Communication error
between the ECU and
the smart key unit.
Codes transmitted be-
tween the ECU and the
smart key unit do not
match.
Unidentified code is re-
ceived.
8-118
SMART KEY SYSTEM
Cause
Radio wave noise inter-
ference.
• Lock condition in the
smart key
• Defective smart key
• Defective smart key
unit
Radio wave noise inter-
ference or disconnect-
ed lead.
• Obstruction due to ra-
dio wave noise
• Disconnection in the
wire harness
• Defective ECU
• Defective smart key
unit
Radio wave noise inter-
ference or disconnect-
ed lead.
• Obstruction due to ra-
dio wave noise.
• Disconnection in the
wire harness
• Defective ECU (when
the ECU or smart key
unit is replaced with a
unit from a different
vehicle)
• Defective smart key
unit
Radio wave noise inter-
ference or disconnect-
ed lead.
• Obstruction due to ra-
dio wave noise
• Disconnection in the
wire harness
• Defective ECU
• Defective smart key
unit
Check or maintenance
job
Perform the checks and
maintenance job for
"Engine does not start
even though vehicle
power is turned on."
Perform the checks and
maintenance job for
"Engine does not start
even though vehicle
power is turned on."
Perform the checks and
maintenance job for
"Engine does not start
even though vehicle
power is turned on."
Perform the checks and
maintenance job for
"Engine does not start
even though vehicle
power is turned on."