DANA TM4 SUMO MD MV, Руководство по устранению неисправностей

Страница: 38 / 182

38
Service Codes
TT02: Inconsistence in EEPROM memory section
Description
This Troubleshooting Tree 02 indicates when MCU is
started up and when it is shut down, and invalid data
is recorded in the EEPROM. This is discovered
through the verification known as Cyclic Redundancy
Check (CRC), which detects whether a SysFile entry
data is corrupted.
These SysFile IDs indicate a minor issue if other
subsequent power-on are shown in the SysFile
history.
It may also be caused by a unit shut down where the
MCU did not go into the
“READYTOPOWEROFF”
state.
It is less likely that these SysFile IDs would result of a
defective MCU.
Note :
•
Vaux must be permanent through a fuse for a
successful shutdown sequence.
•
Corruption of EEPROM section may occur
upon writing while power (Vaux) is removed.
Note
: SysFile event log only shows one « Info
–
System power-up ».
Note
: Refer to the TM4 Product installation guide for
more details on installation and deinstallation
procedure including safety warning considerations.
To correctly diagnose the faulty system, connect the
Diagnostic Tool (see «Diagnostics» section for test
equipment and descriptions) and follow the
troubleshooting tree procedure below.
See “Safety Warnings” and “Troubleshooting Tips”
sections for general guidelines on system diagnostics.
Related Process
The TT02 call the following process:
•
Appendix 3: Save EEPROM Sections.
System Mode Referred by
SysFile ID Condition Possible Causes
Shutdown.
0x000A 0x1300
0x4209
MCU was shut down
without reaching
“ReadyToPowerOff” state.
1. Wrong shutdown sequence. Auxiliary
vehicle battery (Vaux) (12V or 24V)
powered OFF before the MCU
“Ready To
Power OFF
” CAN status on a shutdown
sequence.
2. Defective MCU.