TM 9-2320-272-24-1
Table 2-7. CTIS Doubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Refer to malfunction 1, test 1, step 1.
Step 3. Perform leak test on hub air seals (para. 3-462). Replace faulty air seals
(para. 3-460 or 3-461).
Test 3. Check condition of pneumatic controller.
Listen for clicking noise when selecting mode change. If click is not heard, replace or
repair pneumatic controller (para. 3-454).
Test 4. Determine ability of system to maintain correct deflate control pressure.
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. Check quick exhaust valves for obstructions. If clogged, clear with compressed air or
sturdy wire.
Step 2. Check for continuous and audible air flow from relief valve on pneumatic controller
during deflation. If air flow is continuous and audible, replace faulty relief safety
valve(s) (para. 3-455).
Test 5. Determine reason for false indication.
Step 1. Perform leak test on hub air seals (para. 3-462). Replace faulty air seals (para. 3-460 or
3-461).
CAUTION
Turn battery switch to "OFF" position before disconnecting or
connecting ECU wiring harness. Failure to do so may result in
damage to ECU.
Step 2. Disconnect CTIS wiring harness cannon at ECU and measure voltage between pins X
and V on cannon. Turn battery switch to "ON" position and check voltage.
a. If voltage is below 23 volts, replace CTIS wiring harness (para. 3-470).
b. Troubleshoot vehicle electrical system (para. 2-22).
Step 3. Check connection of electrical lead on pressure transducer at pneumatic controller.
Clean and tighten.
Step 4. Replace pressure transducer (para. 3-453).
Step 5. Replace pneumatic controller (para. 3-454).
Step 6. Replace ECU (para. 3-468).
END OF TESTING!
2. FOUR PRESSURE MODE LIGHTS FLASHING
Test 1. Determine which tire(s) is low.
Step 1. Measure and record pressure of each tire (TM 9-2320-272-10). If any tire(s) is
significantly outside limits, determine the cause.
Step 2. Inspect air lines between wheel valve and wheel rim for leaks, cracks, damage, and
restrictions.
Refer to malfunction 1, test 1, step 1.
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