Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 31)

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Service Codes
Inflate T
rend (Codes 36,
37)
Inflate Trend (Codes 36, 37)
On 2-channel systems, use the
diagnostic tool to identify the
faulty channel: front or rear.
Using the diagnostic tool, initiate
inflate mode on the faulty channel.
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.
Make sure all tires on the channel
are at the same pressures.
Is air leaking
through the QRV?
Replace the QRV and
retest the system.
Are there any
leaks in the control
lines or seals?
Is air leaking
out the PCU vent
port?
Fault code is not active.
Reverify flowchart steps and
wait for fault to reoccur.
Repair leaks and retest.
Replace PCU and retest.
Note: While replacing the PCU, pay particular
attention to possible air line contamination (e.g.,
oil, water, particles) which may suggest further
air system maintenance needs.
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