Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 44)

44
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 8P! displays if the atmospheric pressure reading is out of range.
The atmospheric pressure reading can be out of range as a result of air
bleeding back into the Pneumatic Control Unit (PCU) or because of a
faulty pressure transducer.
The components that can cause a code 8P! to be set include:
• Faulty pressure transducer
• Faulty Pneumatic Control Unit
• Faulty Electronic Control Unit (ECU).
To correctly diagnose the faulty component, connect the Diagnostic
Tool (see Section 5 for test equipment and descriptions) and follow the
procedure in the 8P! troubleshooting tree.
See “Troubleshooting Tips” on page 20 for general guidelines on system
diagnostics.
Code:
8P!
Type:
Atmospheric