TM 9-2320-363-20-1
Display: 5 Flashing Lights
Type: Inadequate Air Pressure
System Mode
Condition
Possible Causes*
System waits to check
Pressure switch won't close
Compressor governor cut-out set too low
pressures
Air dryer needs service
Pressure switch unplugged
Faulty pressure switch
Faulty compressor
Open or broken line from wet tank to Pneumatic Control Unit
Crimped or plugged line from wet tank to Pneumatic Control
Unit
*Possible causes are listed In order of likely occurrence
Air Pressure Check
Note that the Central Tire Inflation System is not
continuously pressurized; pressure checks occur on a
periodic basis. During tire pressure checks, the system
delivers compressed air to the tires for approximately
two seconds while monitoring the pressure.
Code Description
An "Inadequate Air Pressure" code displays if system air
pressure is inadequate to perform a tire pressure check.
This occurs when the pressure switch will not close. The
components that can cause the pressure switch to
remain open include:
Compressor governor cut-out set too low
Pressure switch unplugged
Faulty pressure switch
Faulty compressor
Open or broken line from wet tank to
Pneumatic Control Unit
Crimped or plugged line from wet tank to
Pneumatic Control Unit
To correctly diagnose the faulty component, connect the
Diagnostic Tool (see Page 3-92.16 for test equipment
and descriptions) and follow the procedure in the
Inadequate Air Pressure troubleshooting tree.
See "Troubleshooting Tips" on page 3-92.15 for general
guidelines on system diagnostics.
3-92.20 Change 3
