Group 19, Motor Controls
19-3-16 • CONTROL TROUBLESHOOTING SM 765, Dec ’06
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
232 "MASTER
KO"
Slave micro pro-
cessor detects
Master processor
malfunctioning
SLAVE • Slave and Master microprocessor per-
form a crosscheck in order to verify
functionality. There are two conditions
under which the slave enters this fault
condition:
• The SLAVE microprocessor receives an
incoherent Can message from the MAS-
TER microprocessor.
• The SLAVE microprocessor compares
the inputs status and the related MAS-
TER operations and finds they are not
coherent. In both cases, the SLAVE
brings the controller to a safe status
opening the power bridge and the line
contactor.
233 "NO CAN
MSG 3"
Slave has lost Can
communication
with Pump
SLAVE • Slave (node #4) signals that it has lost
communication with the Master (node
#3) 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
connection.
235 "THERMIC
SENSOR
KO"
Warning: Slave
temperature sen-
sor is our of
range
SLAVE • 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%.
236 "INPUT
MIS-
MATCH"
Slave micro pro-
cessor has
detected a mis-
match between
inputs status and
the input status
transmitted Via
Canbus by master
micro processor
SLAVE • Safety related inputs (Fwd direction, Rev
direction, accelerator Enable, Seat
switch) are inputs to both micro proces-
sors by independent hardware circuit.
The two microprocessors read these
inputs and compare by exchanging
related status on the Canbus. If the
SLAVE microprocessor finds a mismatch
between its inputs and MASTER inputs,
it brings the controller to a safe status
opening the power bridge and the line
contactor.
243 "NO CAN
MSG 5"
Master has lost
Can communica-
tion with Pump
MASTER • Master (node #3) signals that it has lost
communication with the Pump (node #5)
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.
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