DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

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Service Codes
TT04
Description
The Auxiliary vehicle battery voltage (Vaux) is the
low voltage auxiliary battery (12 V to 24 V) for
providing power to the MCU.
The Troubleshooting Tree 04 indicates that the
voltage of the Vaux voltage of the auxiliary vehicle
battery was higher than 33V for 1ms or more.
The potential cause of this warning could be that the
DCDC system is not regulating the auxiliary 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 needed 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.