Spicer TPCS (Tire Pressure Control System) Driver Instructions - Manual (Page 10)

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Service Codes: Following is a list of possible Service Code conditions followed by No-Code conditions.
*Run Flat will override several of the Pneumatic Service Codes. Check tires before proceeding .
* Possible causes are listed in order of likely occurrence.
Service Code System Code Fault Cause
1C! Power No Operation Low power
3C! Speed Sensor Inflate Only Bad connection or no speed signal
4C! Control Communication Inflate Only Bad connection from Electron Control Unit to Operator Con-
trol Panel
5C! PCU Sensor No Operation No sensor reading or too high sensor reading
7C-12C! PCU Solenoid No Operation Solenoid does not pass electrical diagnostics
1P! No Deflate Signal No Deflate Allowed No vacuum at PCU or in control lines
2P! Deflate Trend No Deflate Allowed Deflate did not occur properly
3P! Vacuum Fault No Operation Unintentional vacuum or pressure
*4P! Channel Between Modes Pressure Check Only Slow inflate or deflate
5P! Pressure Read Low Pressure Check Only Quick loss of pressure
7P! Inadequate air pressure Pressure Check Only Pressure switch does not close, or failed closed, or supply
tank pressure does not rise
8P! Atmospheric Pressure Check Only Vent pressure is outside range
9P! Inflate trend Channel Inoperative Channel loses pressure in inflate mode
*10P! Tire Leak (Confirm) Channel Inoperative Channel fails to confirm
*11P! Tire Leak (Imbalance) Channel Inoperative One tire pressure lower than others
No-Code Condition Possible Causes* Service
Operating problems that do not trigger a ser-
vice code. Since a service code was not set, these
conditions may be universal and not call
for a troubleshooting routine. Where fault codes appear, refer to the troublshooting
procedures listed under that code.
Operator Control Plan
Intermittent Operator Control Panel operation
or occasional Logo Only Intermittent ground or power connection
to Operator Control Panel or Electronic
Control Unit. 4C!
No operation (blank display) Fuses
Faulty ground or power connection Check fuses
Repair power/ground
No display of pressures on Operator Control
Panel OCP is in “Quiet Mode” Refer to “Select Key” in Operator Instructions.
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 Con-
trol System. This is normal operation. System will only initiate a deflate if a mode with a
lower target pressure than current target is selected.
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.