Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 40)

40
Troubleshooting
Air Pressure Check
Note that the Tire Pressure Control System is not continuously
pressurized; pressure checks occur on a periodic basis. During tire
pressure checks, the system delivers compressed air to each channel
for approxi mately two seconds while monitoring the pressure in that
channel.
Code Description
Code 5P! indicates an extreme pressure loss. The most likely cause is
an open line which would have a clearly audible leak during inflation. A
secondary cause could be a faulty pressure switch failing to open at wet
tank pressures below 80 psi.
Other components that can cause a code 5P! are:
• Faulty Pneumatic Control Unit (PCU)
• Restricted line between the wet tank and
• Pneumatic Control Unit
• Faulty pressure transducer
• Open line from Pneumatic Control Unit to channel
To correctly diagnose the faulty component, connect the Diagnostic
Tool (see Section 5 for test equipment and descriptions) and follow the
procedure in the 4P! troubleshooting tree.
See “Troubleshooting Tips” on page 20 for general guidelines on system
diagnostics.
Code:
5P!
Type:
Low Pressure Reading