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Code
Alarm
229
POS. EB
SHORTED
SAFETY IN
230
EMERGENCY
COIL SHORTED
MC
231
WATCHDOG#2
Pump
EPS
Traction
(P)
(E)
(T)
Description
Cause :
The output of the built in smart driver, which supplies the
positive to the electromechanical brake coil is high when
the Tiller and the H&S switch are open.
Troubleshooting :
A)
It is suggested to check the harness, in order to verify
if a positive is connected to the Smart driver output
CNA#2.
B)
If, even disconnecting the wire from the connector pin,
the output stays at high value, the problem is inside
the controller and the smart driver is probably shorted.
Cause :
The safety input is opened and accordingly the MC is
opened an EB/AUX OUT coil is driven.
Troubleshooting :
Check the CAN#11 input, if it is connected to -Batt and
the alarm is generated then there is a fault in the
SAFETY IN hardware circuit. Replace the logic board.
Cause :
The voltage on A3 is different than +Vbatt.
Troubleshooting :
A) If A3 is correctly connected to +Vbatt.
B) If the fuse on A3 is not damaged.
Cause :
This alarm occurs when there is a short circuit of the MC
coils connected to CNA#16 output. After the overload
condition has been removed, the alarm exits
automatically by releasing and then enabling a travel
demand.
Troubleshooting :
A)
The typical root cause for this error code to be
displayed is in the harness or in the load coil. So the
very first check to carry out concerns connections
between controller outputs and loads.
B)
In case no failures/problems have been found
externally, the problem is in the controller, which has
to be replaced.
The watchdog circuit is composed by two monostable
multivibrators: a self diagnosis test is carried out to verify
the correct operation of both circuits. This alarm is raised
if the second watchdog circuit has a malfunction.
Troubleshooting :
This alarm could be caused by an hardware failure or by
a software execution problem. For both cases it is an
internal fault of the controller which must be replaced.
7-89
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