Yamaha UMAX Service Manual page 306

Fault code No. 43
Fault code No.
Display name
Symptom
Step Inspection items
1 Resetting the MCU
2 Motor overheated
3 Operation check
Fault code No. 44
Fault code No.
Display name
Symptom
Step Inspection items
1 Resetting the MCU
2 Defective motor speed sensor
3 Wire harness continuity
PC GENIUS DIAGNOSTIC SYSTEM (YUM2E)
43
Motor overheated
Motor overheated
Vehicle stopped
Diagnostic procedure
Cycle the TOW switch off and
on (RUN → TOW → RUN).
Wait until the motor temperature
drops to room temperature.
Set the TOW switch to RUN, the
main switch to ON, depress the
accelerator pedal, and check if
the vehicle runs.
44
Speed sensor error
Motor speed sensor malfunction
Vehicle stopped
Diagnostic procedure
Cycle the TOW switch off and
on (RUN → TOW → RUN).
Replace the motor speed
sensor.
Open or short circuit → Properly
connect or replace the wire
harness.
Between the motor speed
sensor coupler and the MCU
coupler.
Red–Red
White–White
Green–Green
Black–Black
9-21
Confirmation steps after
diagnostic procedure
Connect the PC Genius
diagnostic tool, and check if any
errors are continuously
occurring.
OK → Go to step 3.
NG → Go to step 2.
Connect the PC Genius
diagnostic tool, and check if any
errors are continuously
occurring.
OK → Go to step 3.
OK → Maintenance job
completion.
NG → Refer to "Vehicle
stopped" on page 9-23.
Confirmation steps after
diagnostic procedure
Connect the PC Genius
diagnostic tool, and check if any
errors are continuously
occurring.
OK → Go to step 4.
NG → Go to step 2.
Connect the PC Genius
diagnostic tool, and check if any
errors are continuously
occurring.
OK → Go to step 4.
NG → Go to step 3.
Connect the PC Genius
diagnostic tool, and check if any
errors are continuously
occurring.
OK → Go to step 4.