Spicer TPCS Troubleshooting Guide: Older Systems (ECU's w_Dual Connectors) - Manual (Page 26)

26
Troubleshooting
Code Description
Code 4C! indicates a communication problem between the Electronic
Control Unit (ECU) and the Operator Control Panel (OCP). Code 4C! will
only be observable on a diagnostic tool, it will not show on the Operator
Control Panel. Instead, the Operator Control Panel may be blank
(indicating a power problem) or may display only the logo (indicating a
signal problem).
All of the troubleshooting steps for code 4C! involve checking the
condition of Electronic Control Unit and the Operator Control Panel
circuits. If no circuit problems are found, Code 4C! indicates either a
faulty Operator Control Panel or a faulty Electronic Control Unit.
See “Troubleshooting Tips” on page 20 for general guidelines on system
diagnostics.
Code:
4C!
Type:
Control Communications