TM 9-2320-272-24-1
Table 2-7. CTIS Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Release all air pressure before loosening or removing air system
component(s). Failure to do so may result in injury to personnel.
1. TWO PRESSURE MODES INDICATED WITH STEADY MODE LIGHTS
NOTE
The Electronic Control Unit (ECU) has five pressure mode
settings, with each setting having a mode light. If, during
programmed operation or after manually selecting a pressure
mode setting, two mode lights remain on, the CTIS will dis-
continue operation. Two steady mode lights indicate that a
particular inflate or deflate sequence has taken longer than the
programmed limits allow, and has shut the system off with air
pressure between the modes, indicated by lights.
If system was inflating when it stopped between modes, perform
tests 1 through 3.
If system was deflating when it stopped between modes,
perform tests 4 and 5.
Test 1. Check air supply to CTIS.
WARNING
Compressed air source will not exceed 30 psi (207 kPa). When
cleaning with compressed air, eyeshields must be worn. Failure to
do so may result in injury to personnel.
Step
1. Inspect air lines between wet tank and pneumatic controller for leaks, cracks, damage,
or restrictions.
a. Check for leaks at connections using soapy water. If leaks are present at connections,
tighten.
b. If leaks are result of cracked, split, damaged, or restricted tubing, replace tubing
(para. 3-452).
c. Disconnect air line at both ends. If air line is clogged, clear with compressed air or
sturdy wire.
d. Connect air line.
Step
2. Determine adequacy of air supply from vehicle air compressor.
Repeat inflation sequence with engine running at 1000 rpm for three to five minutes. If
two steady mode lights persist, refer to Compressed Air and Brake Systems
Troubleshooting (para. 2-23).
Step
3. Check water separator and filter element for clogs and damage. Replace filter element or
water separator if clogged or damaged (para. 3-465 or 3-466).
Test 2.
Check air supply to tires.
Step
1. Inspect air lines between pneumatic controller and quick exhaust valves for leaks,
cracks, damage, or restrictions.
Refer to malfunction 1, test 1, step 1.
Step
2. Inspect air lines between quick exhaust valves and wheels for leaks, cracks, damage, or
restrictions.
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