DANA TM4 SUMO MD MV, Troubleshooting Manual

Page: 119 / 182

119
Service Codes
TT27: Phase Current reached Maximum
Description
The Troubleshooting Tree 27 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 : 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
Defective
0x3200 0x3201
0x3202 0x3204
0x3205 0x3206
0x3208 0x3209
0x320A
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.
An external error was caused by
VMU/ECU.
6.
Defective MCU.