AE300-Wizard
Document No.:
E4.08.09
E4.08.09
:
AE_xx_000
Revision:
13
9
:
00
Page:
44 of 89
Copyright © 2019, Austro Engine GmbH
Dept.:
Electric/Electronic
Type:
User Guide
8.2.6
Using the Fault Code Memory (FCM)
8.2.6.1
Overview of the FCM Functionality
Each AE300 ECU uses a non-volatile memory (EEPROM) to store up to 20 fault entries. A
fault entry is defined by its unique “diagnostic trouble code” (DTC). The description of each
possible DTC can be found in the latest revision of the “Maintenance Manual AE 300” (docu-
ment number E4.08.04).
8.2.6.1.1
Diagnostic Trouble Code
Each FCM entry contains the first and last (in case of multiple occurrences) occurrence of a
particular DTC. An occurrence is further described by one of 4 possible error types which are
named MAX, MIN, SIG and NPL. The exact meaning of the error type depends on the DTC
but in general the following explanation is valid.
Error Type
Signal
Explanation
MIN
underrun
indicates a violation of an upper limit
MAX
overrun
indicates a violation of a lower limit
SIG
missing
indicates a totally missing signal
NPL
not plausible indicates a signal which is not plausible
Table 4
Error Types of FCM Entries
8.2.6.1.2
Error Type
Example:
A problem caused by the boost pressure actuator power stage or circuit.
-
The DTC “2526” translates into “Boost pressure actuator power stage failure”. This
translation will be done automatically by the AE300-Wizard when reading the FCM.
-
For this DTC all 4 error types have been defined and have the following meaning:
○
MAX: “Short circuit to BATT of BPA power stage output”. This means, the voltage
measured by the ECU at the output stage is higher than the limit defined. A possible
explanation could be a short circuit to U
Batt
for example.
○
MIN: “Short circuit to GND of BPA power stage output”. This means, the voltage
measured by the ECU is lower than the defined limit. A possible explanation could
be a short circuit of the sensor wire to the airframe (GND).
○
SIG: “Open circuit of BPA power stage output”. This means, the ECU doesn’t detect
any electric current flowing through the output stage when activated. A possible ex-
planation could be a broken sensor wire.
○
NPL: “Excess temperature of BPA power stage”. The ECU SW includes a variety of
plausibility checks and this failure usually indicates that some values (e.g. sensor
values) do not agree. In the case of the boost pressure actuator power stage, this
error type is used to indicate overheating of the output stage.
8.2.6.1.3
Caution Lamp
Depending on its severity, a fault will just be entered into the FCM or in addition the pilot will
be notified via a warning message of the cockpit display system (= caution lamp relevant
faults).
8.2.6.1.4
Multiple Occurrences
If a failure situation “heals” itself (e.g. a faulty signals drops back within normal limits) the
entry of this DTC will remain in the FCM but it will not be marked as “active” anymore. If the
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