DANA TM4 SUMO MD MV, Troubleshooting Manual

Page: 69 / 182

69
Service Codes
TT09: HVIL Output Fault
HVIL
The HVIL is short for “High Voltage Interlock Loop”.
HVIL is a hardware signal, and its purpose is to
protect the user. When the system is fully installed
and connected, the HVIL internal loop is closed which
results in a short circuit between its two input pins.
The HVIL signal is used to open the high-voltage
battery contactor when its internal loop is opened
during product maintenance or repair (e.g. removal of
the MCU cover or disconnection of motor sensor
cable) thereby protecting the user.
Description
The troubleshooting tree 09 indicates an error where
the detected high voltage for the HVIL loop is outside
of the limits set by the Operations and Maintenance
guide.
The potential causes of this SysFile ID are listed
below, in order of likelihood:
1. The HVIL parameters of the MCU are not set
correctly according the user preferences, and
the Operation and Maintenance guide.
2. There is another system that is opening the
HVIL loop from the HVIL output of the MCU.
To fix this fault refer to the troubleshooting
guide of the other system.
3. The connectors that connect the HVIL circuit
to the MCU are somehow defective. In this
case, the system must be turned OFF and the
connectors must be repaired.
4. The MCU itself is defective, and must be
replaced.
Note: Refer to the TM4 Product installation guide for
more details on installation and deinstallation
procedure including safety warning considerations.
Note: Refer to the TM4 Product Operation and
maintenance guide for more details.
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 0x031E
The output of the HVIL
line had a fault.
1.
MCU HVIL parameters were not correctly
configured.
2.
Another system opens the HVIL loop from
the HVIL input of the MCU.
3.
Defective VMU/MCU interface connector
on the MCU.
4.
Defective MCU.