Table 3-1. Troubleshooting (Contd).
TEST OR INSPECTION
AIRBRAKE CONTROL KIT
TRAILER AIRBRAKES DO NOT OPERATE WHEN AIRBRAKE CONTROL HANDLE IS PULLED DOWN.
Check to see if trailer air supply valve control knob is not in pressed-in position (para. 2-47).
If not, press in trailer air supply valve control knob and hold in place for 15 seconds. Release valve. If
valve does not stay in, notify unit maintenance.
Check to see if trailer air lines are securely connected to air couplings of towing truck.
If not, securely connect trailer air lines of air coupling, and open air coupling valves.
CTIS STATUS INDICATION AND MALFUNCTIONS
Central Tire Inflation System (CTIS). CTIS is designed to work automatically in case of tire leakage.
Additionally, CTIS will adjust tire pressure when a road surface selection is made, to preset valves. Refer to table 3-2,
CTIS Indications, for explanation of indications or malfunction.
CTIS Integration with the Airbrake System. The Central Tire Inflation System uses the same air
compressor that supplies air to the vehicle brakes. The vehicle brakes are always given priority over the CTIS. When
brake operation causes the air pressure in the brake reservoir to fall below a preset limit, inflation will stop until the air
compressor has refilled the brake reservoir. If the CTIS was deflating the tires, it would continue to do so.
To prevent damage to transmission, refer to paragraph 2-15 for proper transmission shifting procedures.
Rapid Inflation. The most rapid tire pressure increase is achieved during vehicle operation. Keep the
transmission downshifted to a lower gear. Keep engine operation at 2, 000 rpm. Engaging the turbocharger supplies
extra air pressure directly to the air compressor.