TM 9-2320-363-20-1
Display: 4 Flashing Lights
Type: Tire Leak (Confirm)
NOTE: RUN FLAT overrides this fault
System Mode
Condition
Possible Causes*
Channel inoperative
Channel confirmation failure
Damaged or leaking tire
Leaking line between wheel valve and tire
Plugged or restricted Quick Release Valve
Leaking Wheel Valve
Plugged or restricted PCU vent line
*Possible causes are listed in order of likely occurrence.
Air Pressure Check
Note that the Central Tire Inflation System is not
continuously pressurized; pressure checks occur on a
periodic basis. During tire pressure checks, the system
delivers
compressed
air
to
each
channel
for
approximately
two
seconds
while
monitoring
the
pressure in that channel.
Code Description
A "Tire Leak (Confirm)" code occurs if a channel fails to
confirm tire pressure. Following an inflate or deflate
sequence, the Central Tire Inflation System will return to
confirm, or "double-check" the new pressure. If the
pressure has dropped, the system will re-inflate, and
then
reconfirm
the
tires.
After
multiple
failed
confirmation attempts, the system will log a Tire Leak
(Confirm) code and the system will become inoperative.
A confirmation failure can be caused by:
Damaged or leaking tire
Leaking air line between the wheel valve and tire
Plugged or restricted Quick Release Valve
Leaking wheel valve
Plugged or restricted PCU vent line
To correctly diagnose the faulty component, connect the
Diagnostic Tool (see Page 3-92.16 for test equipment
and descriptions) and follow the procedure in the Tire
Leak (confirm) troubleshooting tree.
See "Troubleshooting Tips" on page 3-92.15 for general
guidelines on system diagnostics.
3-92.32 Change 3
