DANA TM4 SUMO MD MV, Troubleshooting Manual

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33
Diagnostics
Troubleshooting Tips
This checklist outlines some general hints and
guidelines that will be helpful in tracking down and
correcting operating problems.
Systems not provided by Dana TM4 are not
covered in this guide
Systems that are not provided or selected by Dana
TM4 are not covered by this troubleshooting guide
and might require use of additional external
documentation.
Calling after-sales services
This guide is meant to cover a dealership / garage
level of troubleshooting. If the troubleshooting tree
does not provide a solution to troubleshoot or solve
an issue, it is highly recommended to consult after-
sales services to continue troubleshooting.
A cleared code alone does not indicate a
corrected problem.
A service code is set by a specific fault condition and
may be cleared by switching the ignition off, and
then on. It’s possible to clear an error message only
to have it display again when the fault condition
reoccurs. To make sure an issue is fixed, be sure to
run the system through the same operating modes
that caused the issue and verify that the service
code does not reappear.
Electrical faults are often connection
problems
The most likely cause of electrical faults will be
damaged wires or connections. As a first step in
troubleshooting all electrical codes, switch off
vehicle ignition and make sure that the Vaux is
disconnected,
then disconnect applicable
connectors and inspect for damage. (Switching off
the ignition and Vaux is required before
disconnecting the harness at the MCU but is also a
recommended practice before all other electrical
system disconnections.) Clean or repair all bad
connections before proceeding.