WRENCH-IMPACT 5409478 - Caterpillar

Detailed FMI Explanation
FMI 0 "Data Valid But Above Normal Operating Range (Most Severe)" - Every electronic control system sets a high limit for the expected operating range of the signal. The high limit includes over range signals, which could be a high temperature. A sensor that is still operating but sending a signal above the expected limit will cause an FMI 0 to be activated. An FMI 0 is activated when the condition is a Level 3 condition (most severe).Some of the conditions that can cause the FMI 0 DTC to be activated are:
The medium or component that is being monitored is above the normal range.
The signal is shorted to another voltage source.
The sensor needs calibrated.
An ECM has