Fault Condition:
Turn the ignition key ON. Check the Failure Mode Identifier (FMI) using a diagnostic computer.
If the FMI is 2 (Data Erratic), update the software for the Instrument Cluster Module (ICM) and or the Engine Management System (EMS) Module.
If only FMI 12 (Failed Device) is set check the data lines J1587/J1708 where they pass throught the cab and also at the Instrument Cluster (IC) Module for physical damage and repair as necessary. Retest the system. If only FMI 12 (Failed Device) is set, replace the Instrument Cluster Module.
If MID 128 PID 224 FMI 12 is set in combination with additional fault codes from MID 128 (PID 49, PID 84, PID 85, PID 91, PID 228) check the data lines J1587/J1708 where they pass throught the cab and at the Engine Management System (EMS) Module for physical damage and repair as necessary.
If the data lines do not show any signs of physical damage refer to code MID 144 SID 231 for Data Line Diagnostics.
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