This section covers the equipment and procedures used
to find and correct Central Tire Inflation System
Central Tire Inflation System troubleshooting can be
performed at three levels:
Electronic Control Unit light codes
Personal computer based diagnostics
troubleshooting procedures will be based upon the
diagnostic service codes. The hand-held tester and the
personal computer system offer the advantages of
Each light sequence may represent more than one fault.
Use of a hand-held or PC based diagnostic tool will give
a brief description of the specific fault, narrowing the
area of troubleshooting.
ECU Light Codes
The onboard system diagnostics are an important
feature of Eaton's Central Tire Inflation System. For a
Instructions section of this manual.
An MPSI hand-held tester may be used
to read and clear service codes and to
obtain a short description of failures. The
tester can initiate test sequences for
controller outputs and can also read
Personal Computer-Based Diagnostics
capability of hand-held testers with enhanced display
Use of a personal computer requires a serial link
assembly (industry standard SAE J1587/1708) such as
Kent-Moore's part number J38351 and Eaton's Central
Tire Inflation System diagnostic software.
Connection of a Hand-Held or PC based diagnostic tool
is at the standard SAE J1587 connector.
Hand-held or PC based diagnostic tools allow the
system to be placed in several diagnostic modes:
Monitor (normal) - ECU controls tire pressure, while
tool only monitors status.
Inflate - System "manually" inflates (test for large leaks).
Hold - Pressure is held in control lines (test for small
Deflate - System "manually" deflates (test relief valve
Pressure Check and Hold - System checks and
displays tire pressures, then holds pressure in air lines
3-92.16 Change 3