PISTON 2290923 - Caterpillar

Failure Mode Identifier (FMI) Codes
Table 2
FMI No.    Description    
0     Data valid but above normal operational range    
1     Data valid but below normal operational range    
2     Data erratic, intermittent, or incorrect    
3     Voltage above normal or shorted high    
4     Voltage below normal or shorted low    
5     Current below normal or open circuit    
6     Current above normal or grounded circuit    
7     Mechanical system not responding properly    
8     Abnormal frequency, pulse width, or period    
9     Abnormal update    
10     Abnormal rate of change    
11     Failure mode not identifiable    
12     Bad device or component    
13     Out of calibration    
14     Not Used    
15     Not Used    
16     Parameter Not Available    
17     Module Not Responding    
18     Sensor Supply Failure    
19     Condition Not Met    
20     Not Used    FMI 00 - Data valid but above normal operational rangeEvery electronic control system sets a high limit for the expected operating range of a signal. The limit includes ranges such as high converter temperatures. A sensor that is still functioning but sending a signal above the expected limit will cause the FMI 00 code to be stored.Example - A pulse width modulated sensor is not expected to generate a valid signal over 80 percent of the duty cycle. A sensor could generate a signal that is above 80 percent. The sensor is still functioning but the signal is now above the expected signal limit.FMI 01 - Data valid but below normal operational rangeEvery electronic control system sets a low limit for the expected operating range of a signal. The limit includes ranges such as low engine oil pressure. A sensor that is still functioning but sending a signal below the expected limit will cause a FMI 01 to be stored.Example - Most pulse width modulated sensors are not expected to generate a valid signal that is less than 5 percent of the duty cycle. A sensor could generate a signal that is below 5 percent. The sensor is still functioning but the signal is now above the expected signal limit.FMI 02 - Data erratic, intermittent, or incorrectFMI 02 occurs when signal data from a component is present. Then, one of the following events happens to the data.
The data disappears.
The data becomes unstable.
The data becomes invalid.Data can be correct at times and data can be incorrect at other times. This code also relates to communication between electronic controls. For example, the VIMS looks for the engine speed from the engine electronic control over the CAT data link.FMI 03 - Voltage above normal or shorted highFMI 03 occurs when the voltage reading from the component or the voltage reading from the system is high. FMI 03 is often related to a signal circuit.The following elements of a system can cause a FMI 03 code.
The sensor
The harness
A related electronic