Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 18)

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Diagnostics
This section covers the equipment and procedures used to find and
correct Tire Pressure Control System problems.
Test Equipment
Tire Pressure Control System troubleshooting can be performed at three
levels:
• Operator Control Panel codes
• Hand­held tester
• Personal computer­based diagnostics
Regardless of the testing equipment used, the troubleshooting
procedures will be based upon the diagnostic fault codes. The hand­held
tester and the personal computer system offer the advantages of com­
puter­aided testing without interpreting fault codes.
Tire Pressure Control System Diagnostics
The onboard system diagnostics are an important feature of Spicer’s Tire
Pressure Control System. This section describes the use of fault odes to
identify Tire Pressure Control System operating problems.
Tire Pressure Control System uses an alpha­numeric code, displayed
at the Operator Control Panel, to identify the type (P=Pneumatic or
C=Component) and area of fault (num ber). An example code is 1C!,
where 1=power supply and C=component. Refer to the fault code chart
(page 21) for more detailed information on fault codes.
Historical Fault Codes
Any time a fault occurs in the system an active fault code will be
displayed by the Operator Control Panel. Only the most recent code is
displayed by the Operator Control Panel. Historical codes are stored in
memory. Historical codes can only be accessed by a hand held tester or
personal computer. Historical codes are automatically cleared after 50­
100 starts with no active faults.
Fault Codes
The Fault Codes are described in Section 6. Some fault codes also
identify the component that is associated with the problem. A list of
possible solutions are given in order of most likely occurrence.