Final system checkout – Spicer TPCS Troubleshooting Guide User Manual

Page 58

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)

Acceptance criteria: Isolated PCU < 22 inHg, Individual channels ±1 inHg of Isolated PCU