DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

Page: 157 / 192

157
Service Codes
TT38
Description
The event category 38 indicates an error due to the
deactivation process that couldn't be successfully
executed.
The SysFile IDs occur in the same session (under the
same ‘’ Info – System Power Up’’) as the ‘’ Back EMF
Motor reduction mechanism activated (phases are
short-
circuited)’’ error.
The VMU/ECU might have sent a shutdown request
to the MCU while the motor speed was greater than
given threshold.
The MCU itself may be defective.
Note : on shutdown request while vehicle speed is
high
The ECU / VMU controller must have sent a shutdown
sequence request via CAN message to the MCU that
caused the warning.
« Back EMF Motor reduction mechanism
activated
(phases are short-circuited) »" to be raised while the
motor speed was greater than the threshold of that
warning. The ECU / VMU controller could have
registered a fault at its level and shutdown the MCU.
In that case, the source of the problem must be
investigated at the ECU / VMU controller level.
Note : Refer to the Application Note High-speed fault
management document.
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
0x050B 0x050C
Deactivation
process couldn't be
successfully
executed.
1.
The VMU/ECU has sent a shutdown
request to the MCU during operation,
causing this error to be raised.
2.
Defective MCU.