Fault Code Table - Yamaha UMAX Service Manual

Fault code table

Fault code
Display name
No.
8 Main relay drive
fault
20 Over current
22 Over voltage
23 Power circuit
overheated
24 Control circuit
overheated
25 Internal circuit
overheated
26 Motor circuit short
27 MCU temperature
too low
29 MCU internal error
30 MCU internal error
31 MCU internal error
32 MCU internal error
33 MCU internal error
35 TPS signal too high Accelerator sensor
PC GENIUS DIAGNOSTIC SYSTEM (YUM2E)
Item
Main relay drive
fault
Over current fault
Over voltage fault
Main circuit
overheated
Control circuit
overheated
Condenser
overheated
Interphase short
circuit
Temperature too
low
Main circuit
temperature sensor
connection failure
Control circuit
temperature sensor
connection failure
Condenser
temperature sensor
connection failure
Motor temperature
sensor connection
failure
Abnormal offset
current
voltage failure high
side
9-24
Symptom
Motor output • Main relay drive short
shut-off, vehicle
stopped (no
• Short circuit in the
regeneration)
Motor output • Motor internal short
shut-off, vehicle
stopped (no
• Short circuit in the cable
regeneration)
Motor output MCU over voltage
shut-off, vehicle protection
stopped (no
regeneration)
Motor output MCU heat protection
shut-off, vehicle
stopped (no
regeneration)
Motor output MCU heat protection
shut-off, vehicle
stopped (no
regeneration)
Motor output MCU heat protection
shut-off, vehicle
stopped (no
regeneration)
Motor output Short circuit of the cable
shut-off, vehicle between the motor and
stopped (no MCU due to incorrect
regeneration) assembly when
reassembling the motor or
MCU
Vehicle stopped Protection from MCU
(with regeneration) failure due to low
temperature
Vehicle stopped MCU internal circuit error
(with regeneration)
Vehicle stopped MCU internal circuit error
(with regeneration)
Vehicle stopped MCU internal circuit error
(with regeneration)
Vehicle stopped MCU internal circuit error
(with regeneration)
Vehicle stopped MCU internal circuit error
(with regeneration)
Vehicle stopped
Accelerator sensor failure
(with regeneration)
Possible cause
circuit
harness between the
MCU and relay drive
circuit
between the motor and
MCU