Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 10)

10
Operator Instructions
Digital Display
The display shows either tire pressure or fault codes for the channel
indicated by the illuminated inner tire rings (see Channel Indicators).
When the system is actively changing tire pressure on the selected
channel, a “bubble” display in clockwise rotation indicates inflation and
counterclockwise indicates deflation.
Fault Indication - The exclamation point indicates that the value shown
in the digital display is not a pressure but rather a fault code. See Fault
Codes Section.
Metric/English Indicator - This unit of measure indicator tells if the tire
pressure is shown in metric (bar) or English (psi) units.
Mode Keys and Annunciator Arrows
These keys select pressures appropriate for different surface and loading
conditions. The annunciator arrow points to the selected key and signals
one of two states:
• If the arrow is flashing ­the system is in the process of checking or
changing pressures.
• If the arrow is lighted steady­ the selected pressure has been
achieved and the system is de­pressurized.
L/U Key (Loaded/Unloaded) - This key selects pressures appropriate
for either a loaded or unloaded vehicle.
HWY - For high speed travel on paved surfaces.
OFF HWY - For operation on secondary roads.
EMER - For selection of extremely low tire pressures to help free a stuck
vehicle.
IMPORTANT: The EMER key is for extreme condi tions only and
should not be used for normal driving.