TM 9-2320-363-20-1 Display: No Code Type: Miscellaneous Condition Possible Causes* Solution Operating problems that do not Since a fault code was not set, these conditions may be   Where fault codes appear, refer to trigger a fault code. universal and not call for a troubleshooting routine. the troubleshooting procedures listed under that code Air Leaks Air bleeding from drive axle vents    Air Seal leaks (Extreme cold temperatures) Drive vehicle to 'warm up" seals Tires fall to deflate when lower    Pneumatic system problem See "No Deflate Signal" code pressures are requested Leaking tires    Damaged tire    Replace tire    Loose connection between wheel valve and tire    Tighten connection    Faulty wheel valve    Replace wheel valve Air bleeding (audible) through QRV     Wheel valve is leaking back through control lines Identify tire with low pressure and when ignition is turned off    QRV vent plugged replace faulty wheel valve Other Apparent continuous operation, or    Too long changing pressures See 'Between Modes", slow inflates or deflates    Loss of pressure during inflate "Trend Fault", "Tire Leak (Confirm)" codes System stopped In middle of inflate or    Intermittent transducer short or open See "Pressure Transducer" code deflate (display shows steady mode light before reaching targeted pressures) Wheel end oil leak    Faulty air or oil seal Optional "load" switch seems to have    Broken, shorted, or open wire to load switch Use diagnostic tool In monitor mode no effect   · Faulty load switch to verify load status changes when switch position changes Use wiring diagram to test harness for shorts or opens Replace load switch * Possible causes are listed In order of likely occurrence Change 3  3-92.47