DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

Page: 118 / 192

118
Service Codes
TT28
Description
The Troubleshooting Tree 28 indicates an error where
the current in one or more of the phase cables were
at the maximum design threshold.
This SysFile may be raised by Back EMF Motor
reduction mechanism or warning of the Motor-Control
Inverter 0x00 to 08 or by a connector issue.
The low Vaux may raise these SysFile IDs, refer to
the Troubleshooting tree TT03.
An external error from VMU/ECU can be a cause. It
must be investigated.
The MCU itself may be defective.
Note : If the auxiliary vehicle battery system is
defective turn Ignition off and high voltage electrical
sources, refer to the auxiliary vehicle battery
Troubleshooting Guide.
Note : The Vaux fuse connecting the auxiliary vehicle
battery became more resistive, or about to open. In
this case, turn Ignition OFF and all high voltage
electrical sources, refer to the auxiliary vehicle battery
or Low Voltage distribution board Troubleshooting
Guide.
Note : Vaux too low
If the Vaux level is too low, the current sensors used
for the phase current readings could saturate and
falsely interpret the current to be too high.
Note
: Back EMF Motor reduction mechanism
If any error type is raised by the system while the motor
speed is beyond the « unsafe speed », the motor
phases will be short circuited by the control to maintain
DC bus under the high voltage limit until the motor
speed is reduced below the « unsafe speed ».
At the time the motor phases are short circuited, it is
normal that the phase currents and potentially the input
DC current will temporarily exceed the limits and raise
these errors type.
Note : Refer to the MCU 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
0x3200 0x3201 0x3202
0x3204 0x3205 0x3206
One or more of the
phase currents
reached the
maximum design
threshold.
1.
Short circuit between phases.
2.
The auxiliary vehicle battery not operating
correctly.
3.
Intermittent or bad Vaux connection at the
MCU.
4.
Vaux Fuse about to open or more
resistive.
5.
0x050B and/or 0x050C error occurred
due to a VMU / ECU controller that sent a
shutdown request CAN message while the
motor speed was high (phase short circuit
mechanism engaged).
6.
Defective MCU.