Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 39)

36
Service Codes
T
ire Leak (Imbalance)
(Codes 44, 45)
Tire Leak (Imbalance) (Codes 44, 45)
On 2-channel systems, use diagnostic tool to
identify faulty channel: front or rear.
Manually check the tire pressures on the faulty
channel at the wheel valves.
Are any wheel
readings low?
Check the following:
Tire damage
Wheel valve filter
Air line leaks
Wheel seal air leaks
Wheel valve leaks
Repair faulty components
and recheck the system.
Are any wheel
readings high?
Check for a blocked QRV exhaust or
plugged wheel valve filter or valve
stem. Make repairs to faulty
components and recheck the system.
Use diagnostic tool to place system into
inflate mode and check for audible leaks
(see note under Code Description on
previous page).
Is there an
audible leak?
Make repairs to faulty
components and recheck system.
Use diagnostic tool to place system into
“Pressure Check and Hold” mode and look
for steady hold pressure.
Was pressure
steady?
Use diagnostic tool to
vent system.
Is air leaking
from the QRV
exhaust port.
Locate the leaking wheel valve
associated with that QRV and
replace it. Recheck the system.
Check the system for
kinked lines. Repair faulty
components and recheck
the system.
Yes
No
No
Yes
Yes
Yes
No
No
No
Yes
Find leak and make repairs to faulty
components. Recheck system.