Spicer TPCS Troubleshooting Guide - Manual (Page 44)

41
Service Codes
Group: 8P! (Code 35)
Type: Atmospheric
Air Pressure Check
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 approximately two seconds while
monitoring the pressure in that channel.
Code Description
When the system measures tire pressures it also uses the
pressure sensor in the PCU to read atmospheric pressure.
Group 8P! displays if the atmospheric pressure reading is out
of range.
The components that can cause a group 8P! to be set include:
• Faulty PCU Sensor or wiring.
• Faulty Pneumatic Control Unit.
• Faulty Electronic Control Unit (ECU).
To identify the root cause of the problem, connect the
diagnostic tool (see Diagnostics Section for test equipment
and descriptions) and follow the procedure in the 8P!
Troubleshooting Tree.
See "Troubleshooting Tips" for general guidelines on system
diagnostics.
System Mode Condition Possible Causes
(Listed in Likely Order of Occurrence)
Pressure check only Pneumatic Control Unit
pressure out of range - Faulty PCU Sensor.
- Faulty Pneumatic Control Unit.
- Faulty Electronic Control Unit.