Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 41)

38
Service Codes
T
ire Leak (Confirm) (Codes
41, 42)
Tire Leak (Confirm) (Codes 41, 42)
No
Using the diagnostic
tool, initiate inflate mode.
Is there a
damaged tire?
Is there a leaking
hose between a tire
and wheel valve?
Repair tire and
retest system.
Replace the hose and
retest the system.
Use diagnostic tool to
vent system.
Does air
continue to vent
out PCU vent
line?
Is air leaking
through the QRV
exhaust?
Service code is not active.
reverify flowchart steps and
wait for fault to reoccur.
Check vent line.
Identify axle where
tire pressure is low.
Replace QRV.
Locate the leaking wheel valve
associated with that QRV and
replace it. Recheck the system.
On 2-channel systems, use the diagnostic tool
to identify the faulty channel: front or rear.
Manually check the tire pressures on the faulty
channel at the wheel valves. A low tire(s)
indicates likely location of problem.
Yes
Yes
Yes
No
No
Yes
No
Check for restrictions
between QRV and
wheel valve.
Are restrictions
present?
Yes
No
Repair restrictions and
recheck system.