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Code
Alarm
232
KEY OFF
SHORTED
POWER MOS
233
SHORTED
234
EV1/5 DRIVER
SHORTED
Pump
EPS
Traction
(P)
(E)
(T)
Description
Cause:
This fault is displayed when the controller detects a low
logic level of Key-Off signal during Start-Up diagnosis.
Troubleshooting :
It is very likely the fault is due to an under voltage, so it is
suggested to check :
A)
Key input signal down-going pulses (below under
voltage threshold) due to external loads, like DC/DC
converters starting-up, relays or contactor switching,
solenoids energizing/de-energizing.
B)
Check the connection of power cables to the battery
terminal, positive and negative, to MC and to
controller +Batt and .Batt, which must be screwed
with a torque comprised in the range
C)
If no voltage transient is detected on the supply line
and the alarm is present every time the key is
switched ON, the failure is probably in the controller
hardware, so it is necessary to replace the logic
board.
Cause :
Before switching the LC on, the software checks the
power bridge: it turns on alternatingly the Low side and
High side Power Mosfets and expects the phases
voltage to decrease down to -BATT (increase up to
+Batt). If the phases voltage do not follow the
commands, this alarm occurs.
Troubleshooting :
This type of fault is not related to external components;
replace the controller.
Cause :
Before switching the MC on, the software checks the
power bridge: it turns on alternatingly the Low side and
High side Power Mosfets and expects the phases
voltage to decrease down to -BATT (increase up to
+Batt). If the phases voltage do not follow the
commands, this alarm occurs.
Troubleshooting :
This type of fault is not related to external components;
replace the controller.
Cause :
Electrovalve EV1 or EV2 driver is shorted.
Troubleshooting :
Check if there is a short or a low impedence between the
negative of one of those coils and -BATT. Otherwise the
driver circuit is damaged and the controller must be
replaced.
7-91
13Nm÷15Nm.
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