DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

Page: 153 / 192

153
Service Codes
TT37
Description
The Troubleshooting Tree 37 indicates a warning
where the VMU command is timed out because it was
not received within the CAN timeout limit.
There may be an issue with the controller. Make sure
the controller complies to the CAN protocol defined in
the CAN protocol document when communication
with the MCU.
The VMU/ECU harness interface connector for
integrity loss might be causing an error in the CAN
communications.
The CAN network might cause the issue fixed. Refer
to the CAN protocol document published on the Dana
TM4 extranet site.
The MCU itself may be defective.
Note : Refer to the CAN protocol document as
published on the Dana TM4 extranet site.
Note : on CAN termination on a CAN bus
For optimised communication on a CAN bus, there
should be a termination resistor of 120
Ωs between
the CAN lines (high and low) at one end of the CAN
bus and another termination resistor of 120
Ωs
between the CAN lines at the other end of the CAN
bus. This makes a resultant end termination of 60
Ωs.
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
0x4013 0x4014 0x4015
0x4121 0x4122 0x4123
0x4124 0x4125 0x412D
0x4703
VMU command timed
out. Sequencer
Detected a CAN
Communication Error
1.
Verify MCU CAN protocol document for
protocol requirements (controller issue).
2.
Defective CAN connection (Cable or
harness).
3.
Defective CAN network.
4.
Defective MCU.