Group 19, Motor Controls
SM 765, Dec ’06 CONTROL TROUBLESHOOTING • 19-3-17
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
245 "WRONG
SET BAT-
TERY"
Battery voltage
does not corre-
spond to pro-
grammed "SET
BATTERY"
MASTER • This fault indicates that actual battery
voltage is 20% higher or 20% lower than
"SET BATTERY" parameter setting.
Replace battery with correct battery.
246 "SLAVE
KO"
Master micro pro-
cessor detects
Slave micro pro-
cessor Malfunc-
tioning
MASTER • Slave and Master microprocessor per-
form a crosscheck in order to verify
functionality. If the MASTER detects
SLAVE microprocessor malfunctioning,
it brings the controller to a safe status
opening the power bridge and line con-
tactor.
247 "NO CAN
MSG 4"
Master has lost
Can communica-
tion with Slave
MASTER • Master (node #3) signals that it has lost
communication with the Slave (node #4)
This fault could be determined to be a
problem in the truck CAN-BUS line or
be an internal problem in the controller
logic card. First check the CAN_BUS
connections.
249 "THERMIC
SENSOR
KO"
Warning: Mas-
ter temperature
sensor is our of
range
MASTER • The range of the temperature sensor is
always checked and a warning is sig-
naled if it is out of range. This fault will
reduce the maximum current output of
the controller to 50%.
253 "AUX OUT-
PUT KO"
(Not used)
EB coil driver
shorted or open
MASTER • The microprocessor checks the driver of
the electromechanical brake coil. If the
status of the driver output does not corre-
spond to the signal coming from the
microprocessor, the fault is signaled. It
is suggested to check for an external
short or a low impedance pull-down
between NAUX (C31) and -Batt.
• If no external cause is found
Replace con-
troller
255 "HAND-
BRAKE"
Handbrake switch
closed
MASTER • Indicate that handbrake is activated
• Check wiring and handbrake switch.
Repair wiring or
replace switch if
needed
Blank
"DASH DIS-
PLAY"
Dash Display
blank
MASTER • Check 5 volt power supply for dash dis-
play If no 5 volts
• Check wiring and connector at control
and display. If not wiring or connections
Replace 5 V
power supply
Replace dash
display
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