Spicer TPCS Troubleshooting Guide - Manual (Page 55)

52
Service Codes
No Code
Condition
Operating problems that do not
trigger a service code.
Possible Causes*
Since a service code was not set, these
conditions may be universal and not
call for a troubleshooting routine.
Service
Where fault codes appear, refer to the
troubleshooting procedures listed
under that code.
TIRE PRESSURE
Display shows tires at higher pressure
than target, yet system does not attempt
to deflate. No apparent inflate or deflate. Tire pressure rises due to temperature
are not bled off by the Tire Pressure
Control System. This is normal opera-
tion. System will only initiate a deflate if a
mode with a lower target pressure than
current target is selected.
Pressure imbalance (tires on same
channel at different pressures).
- Defective hose.
- Clogged filters.
Follow troubleshooting for 11P! group.
No inflate or deflate of particular tire. Valve stem core not removed on tire. Remove hose from tire valve stem and
remove core. Replace hose.
Inaccurate tire pressures. - Leaking control lines.
- Faulty pressure transducer.
Follow troubleshooting for 8P! and 11P!
group.
- Incorrect config. connector or bad
connection.
- Faulty Electronic Control Unit.
See wiring schematic.
AIR LEAKS
Air bleeding from rear axle vents. Air Seal degradation. Refer to Service Manual.
Tires fail to deflate when lower
pressures are requested.
Pneumatic system problem. Follow troubleshooting for 3P! group.
Leaking tires. - Damaged tire.
- Loose connection between wheel
valve and tire.
- Loose/leaking tire valve stem.
- Faulty wheel valve.
Refer to Service Manual.
Air bleeding (audible) through
Pneumatic Control Unit when ignition is
turned off.
Wheel valve is leaking back through
control lines.
Identify tire with low pressure and
determine obstruction or replace wheel
valve.
* Possible causes are listed in order of likely occurrence.