DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

Page: 60 / 192

60
TT08
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
MCU cover or disconnection of high power connector)
thereby protecting the user.
Description
The Troubleshooting Tree 08 indicates a warning in
Operational state and an error in Standby state where
the detected 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. The
HVIL parameters should be updated in the
MCU.
2. There is another system that is opening the
HVIL loop from the HVIL input 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 VMU/ECU connectors must be
disconnected from the MCU and repaired.
4. The MCU itself is defective. It should be
disconnected and 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
Standby or
Operational
0x032B 0x32C
The HVIL circuit had
an input voltage that
was outside the
limits.
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.