Display: 4 Flashing Lights
Type: Tire Leak (Imbalance)
NOTE: RUN FLAT overrides this fault
Channel only checks
Tire pressure lower on one
Minor tire leakage at start up (leaked overnight)
tire than others
Severe tire damage or leaks
Contaminated wheel valve filters
Restricted tire valve stem
Leaking wheel valve
Crimped or restricted control lines
*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 the each channel for
pressure in that channel.
A "Tire Leak (Imbalance)" code indicates that either the
tire pressure on one tire or wheel end was read lower
than the other tires, or there is an air leak someplace in
Low tire pressure can be caused by a damaged tire,
plugged wheel valve filter or leaking air lines. An air leak
can be located either before or after the wheel valve.
When using a diagnostic tool to inflate or inflate-
hold a channel with one low tire, air may be heard
leaking out of the QRV(s) by the higher pressure
tires. This is normal and should stop once the low
tire is inflated to the pressure of the other tires.
The components located before the wheel valve that
may cause a "Tire Leak (Imbalance)" code include:
Leaking wheel air seals
Leaking control lines
Restricted QRV exhaust port
Components located after the wheel valve that may
cause an imbalance include:
Clogged or restricted wheel valve filter or
Leaking air lines
Wheel valve damage
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 (Imbalance) troubleshooting tree.
See "Troubleshooting Tips" on page 3-92.15 for general
guidelines on system diagnostics.
3-92.30 Change 3