TM 9-2320-272-24-1
Table 2-7. CTIS Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
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 4. If disconnecting blackout wire in step 3 did not cause amber warning light to flash,
check CTIS wiring harness for shorts between blackout connection and ECU. If CTIS
wiring harness is faulty, repair connections (para. 3-131) or replace CTIS wiring harness
(para. 3-470).
Step 5. Replace ECU with known good ECU (para. 3-468).
Test 2. Determine condition of speed transducer.
Step 1. Check for continuity between ECU and speed signal generator connector. If CTIS wiring
harness is faulty, repair connections (para. 3-131) or replace CTIS wiring harness (para.
3-460).
Step 2. Replace speed signal generator (para. 3-471).
Step 3. Replace ECU with known good ECU (para. 3-468).
END OF TESTING!
9. SYSTEM OVER-INFLATES TIRES
CAUTION
When vehicle is connected to an external air source, ensure that
air is clean and dry. Dirty and wet air may result in CTIS
malfunctions.
Do not operate CTIS while vehicle is connected to an external
air source. This may result in over-inflation or damage to tires.
NOTE
The ECU is programmed in conjunction with vehicle air
compressor output. This procedure requires air source supplied
by vehicle for accurate diagnosis.
Determine accuracy of system pressure reading.
Manually balance tire pressures with external air source. Remove external air source
and run CTIS. Check operation of pressure transducer.
Refer to malfunction 3, test 4, steps 1 through 7.
END OF TESTING!
10. SLOW AIR RECOVERY OR OCCASIONAL LOW AIR WARNING DURING BRAKING
Determine if pressure switch has failed in closed position,
Step 1. Check CTIS wiring harness for continuity between pressure switch and ECU cannon.
Refer to malfunction 3, test 3, steps 1 and 2.
Step 2. Check pressure switch for continuity.
Refer to malfunction 3, test 3, steps 3 through 6.
END OF TESTING!
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