Spicer TPCS Troubleshooting Guide - Manual (Page 58)

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Service Procedures
Final System Checkout
Test Requirements
This test requires use of a diagnostic tool (PC or handheld)
to control and monitor the functions of the Spicer TPCS, and
an accurate tire pressure gauge.
Select Highway-Loaded. Upon successfully achieving
Highway-Loaded, verify tire pressures are within ± psig of
desired pressure. If significant tire imbalance exists, balance
should be achieved by using the system to generate a short
deflate, followed by re-inflating the tires, or by manually
adjusting.
Verify governor cut-out pressure: ________________________________________ (Acceptance criteria: 120-125 psig)
Verify the Pressure Switch cycles open & closed during inflation: Yes / No
Use Diagnostic tool to verify proper configuration: ________________________________________________________
If downloadable configuration is used, verify proper pressure settings, speeds, etc. have been set.
Use Diagnostic tool to DISPLAY SERVICE CODES.
• Clear any existing historical codes.
Use Diagnostic tool to PERFORM DIAGNOSTIC TESTS.
• Select channel and "Pressure Check Tires and Hold" option to pressurize each individual channel. Check for air leaks;
record the initial pressure and then the stabilized pressure 10 seconds later.
• Select item "Pneumatic Control Unit," then "Read Isolated PCU Vacuum" and record PCU vacuum. Next, individually
select each channel and record System Pressure while deflating:
System Pressure: Front Rear Trailer
Initial Pressure
Pressure after 10 sec.
Acceptance criteria: Pressure should not drop.
Isolated PCU Vacuum Front Rear Trailer
(PSIA) (inHg) (inHg) (inHg) (inHg)
Acceptance criteria: Isolated PCU < 22 inHg, Individual channels ±1 inHg of Isolated PCU