Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 31)

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Each of the codes 7C! through 12C! matches one specific
solenoid. When the troubleshooting instructions refer to
connector test points, use Chart A to select the pin test point
for use with the particular fault code you are diagnosing. See
“Troubleshooting Tips” on page 20 for general guidelines on
system diagnostics.
Troubleshooting Tree
Code:
7C!, 8C!, 9C!, 10C!, 11C!, 12C!
Type:
Solenoids
7C = Steer
8C = Drive
9C = Trailer
10C = Supply
11C = Deflate
12C = Control