DANA TM4 SUMO MD MV, Troubleshooting Manual

Page: 46 / 182

46
Service Codes
TT04: Vaux too high
Description
This Troubleshooting Tree indicates that the voltage
of the auxiliary vehicle battery was higher than 33V
for 1ms or more.
The most likely cause of the occurrence of this
SysFile ID is that the DCDC voltage is not regulating
the DC voltage correctly.
There may be intermittent contacts to the pins of the
auxiliary vehicle battery.
The auxiliary vehicle battery itself may be defective.
Specialized equipment may be need to determine
this and fix the issue.
The MCU itself may be defective.
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.
System Mode Referred by
SysFile ID Condition Possible Causes
Operational 0x0314
MCU detected an
auxiliary voltage that was
too high.
1.
DCDC system not regulating auxiliary
DC voltage correctly.
2.
Intermittent contact to the auxiliary
vehicle battery that can cause voltage
spikes due to load dump of the DCDC
system.
3.
The auxiliary vehicle battery is not
working properly.
4.
The MCU is defective.