TM 9-2320-363-20-1
Display: No Mode Lights
Type: Solenoid Fault
(Supply, Deflate, Control,
Front, or Rear)
System Mode
Condition
Possible Causes*
No operation
Pneumatic Control Unit
Solenoid wire shorted to ground
solenoid failed electrical
Solenoid wire shorted to power
diagnostic test
Faulty solenoid
Faulty Electronic Control Unit
* Possible causes are listed in order of likely occurrence.
Code Description
A "Solenoid Fault" code indicates an electrical fault in
the Pneumatic Control Unit (PCU). System operation is
disabled when these faults are detected.
The system shuts down in a fail-safe mode and turns off
the power to the solenoids.
The troubleshooting tree first tests internal solenoid
circuitry. Resistance outside
the specified range of
30
to
80
ohms
indicates
a
defective
solenoid.
Succeeding steps check continuity of the wire harness
circuits between the Pneumatic Control Unit and
Electronic Control Unit (ECU). If the problem can be
traced to a faulty circuit or connector, make the
necessary repairs. If the troubleshooting routine leads to
a problem with the solenoid itself, the Pneumatic Control
Unit must be repaired or replaced. If both the solenoid
and the circuitry check out OK, the Electronic Control
Unit is faulty.
See "Troubleshooting Tips" on page 3-92.15 for general
guidelines on system diagnostics.
3-92.40 Change 3
