DANA SPICER TM4 SUMO HP HV Powertrain, Troubleshooting Manual

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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, make sure that the high voltage contactor is
opened and make sure that the Vaux is disconnected.
You will need to wait about 5 minutes to make sure
that the MCU internal capacitor is completely
discharged (a multimeter can be used to measure the
voltage at the MCU input DC to ensure there is no
remaining voltage). 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.