BAR ASSEM. 2M8794 - Caterpillar

Failure Mode Identifier
The codes for the Failure Mode Identifier are defined by the SAE standards. The following list contains a CAT version of definitions.
Table 2
Failure Mode Identifier and Message Center Displays    
FMI    Description of Failure    
00     "Data valid but above normal operating range"    
01     "Data valid but below normal operating range"    
02     "Data erratic, intermittent or incorrect"    
03     "Voltage above normal"    
04     "Voltage below normal"    
05     "Current below normal"    
06     "Current above normal"    
07     "Mechanical system not responding properly"    
08     "Abnormal frequency, pulse width, or period"    
09     "Abnormal update"    
10     "Abnormal rate of change"    
11     "Failure mode not identifiable"    
12     "Bad device or component"    
13     "Out of calibration"    
14     "Special instruction"    Detailed FMI Explanation
FMI 00 "Data Valid But Above Normal Operating Range" - Every electronic control system sets a high limit for the expected operating range of the signal. The high limit includes higher than normal signals. An example is a high temperature. A sensor that is still operating but sending a signal above the expected limit will cause an FMI 00 to be activated.Some of the conditions that can cause the FMI 00 diagnostic code 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 requires calibration.
An ECM has failed. Normally, the least likely cause of a problem.FMI 01 "Data Valid But Below Normal Operating Range" - Every electronic control system sets a low limit for the expected operating range of the signal. The limit includes signals that are under the lower limit. The low signal could be the oil pressure signal. The sensor is still working but sending a signal below the expected limit will cause an FMI 01 to be stored.Some of the conditions that can cause the FMI 01 diagnostic code to be activated are:
The medium or component that is being monitored is below the normal range.
Poor connections in the circuit.
The sensor has failed.
An ECM has failed. Normally, the least likely cause of a problem.FMI 02 "Data erratic, intermittent or incorrect" - The signal from a component is present. The control that reads the diagnostic information cannot read the signal properly. The signal appears to be gone, unstable, or invalid. The data can be correct or incorrect intermittently. Also, this condition relates to communication between controls. An example of communication between controls: When the monitoring system is looking for the engine speed from the Engine ECM over the CAT Data Link.Some of the conditions that can cause the FMI 02 diagnostic code to be activated are:
There is a poor connection in the circuit.
The signal is intermittent or erratic.
The software has been changed.
The signal is receiving interference from another circuit.
The signal is out of the range.
An ECM has failed. Normally, the least likely cause of a problem.FMI 03