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START HERE
Is the unit
equipped with two way
communication?
Place the Main Power
switch in the OFF posi-
tion. Does the engine
continue to run?
There a problem with the re-
mote communication sys-
tem. Repair as necessary.
Disconnect two way
communication from
the unit and install J1
Jumper. This will elim-
inate remote commu-
nication from the sys-
tem.
Check for defective
Main Power switch. Is
Switch defective?
Replace
defective
switch. Did you find
and correct the condi-
tion?
System OK, re-install
remote communication
disconnected earlier.
Check wiring to the Main Power
switch for an open or short. Did you
find and correct the condition?
Unplug fuel /speed actuator.
Does the unit stop?
Verify the Run Relay de-energ-
izes when the Main Power
switch is placed in the OFF
position.
Check wiring for fuel/speed
actuator for a short. Did you
find and correct the condi-
tion?
Is the relay
defective?
Replace Run
Relay. Did
you find and
correct
the
condition?
Check wiring to Run Relay
for an open or short. Did you
find and correct the condition?
Fuel /speed actuator is
defective or mechanically
seized.
Did the loading
of the software
correct the
problem?
Load current version of
software from http://www.
transcentral.carrier.com.
Did the software load
correctly?
Verify correct fuel/speed actuator
operation & replace if needed.
Operate system in order to verify
repair. Did you find and correct
the condition.
Remove new fuel/speed
actuator & re-install old
component. Old component is
not the fault.
Remove connectors from unit one at a
time to determine if any other devices
are providing power feedback,
causing the micro to remain powered.
Did you find and correct the condition?
Review the results of
above tests with your
supervisor. If
necessary, go to the
beginning of the tree
& test again.
Go To Condition 8 - Programming
Problems with PC Cards if using a PC
Card to upgrade software. Did the
software load correctly?
System OK,
re-install remote
communication dis-
connected earlier.
NO
Figure 9
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7 Micro Diagnostic Tree - Condition 3 - Main Power Switch Off - Unit Fails To Stop