TM 9-2320-363-20-1
Display: NO Code
Type: Miscellaneous
Although the Central Tire Inflation System is self-
diagnosing, there are some operating problems that do
not trigger a fault code. The following chart lists these
conditions along with possible causes and solutions:
Condition
Possible Causes*
Solution
Operating problems that do not
Since a fault code was not set, these conditions may be
Where fault codes appear, refer to
trigger a fault code.
universal and not call for a troubleshooting routine.
the
troubleshooting
procedures
listed under that code.
ECU Display
Blank Electronic Control Unit (ECU)
Power fuse blown
Check Fuses
display
Bad ground to ECU
See "Power" code
Bad switched Ignition line to ECU
Faulty ECU
System loses programmed tire
Improperly followed programming procedure
Reference programming
pressure settings
Faulty Electronic Control Unit
procedure
Replace Electronic Control Unit
Tire Pressure
Diagnostic tool display shows tires at
Tire pressure rises due to temperature, are not bled off by
System will only Initiate a deflate if a
higher pressure than target, yet
the Central Tire Inflation System This is normal operation
mode with a lower target pressure
system does not attempt to deflate
than current target is selected
No apparent inflate or deflate
Pressure switch not closed
See "Inadequate Air Pressure" code
Pressure Imbalance (tires on same
Defective hose
See ”Tire Leak (Imbalance)" code
channel at different pressures)
Clogged filters
No inflate or deflate of particular tire
Valve stem core not removed on tire
Remove hose from tire valve stem
Clogged wheel valve filter or valve stem
and remove core. Replace hose
Change filter.
Inaccurate tire pressures (From
Leaking control lines
See 'Atmospheric" and 'Tire Leak
targets PC tool shows)
Faulty pressure transducer
(Imbalance)" codes
Faulty Electronic Control Unit
Incorrect tire pressure targets
System defaults to original targets
See 'Configuration Error" code
* Possible causes are listed in order of likely occurrence
3-92.46 Change 3
