WEIGHT AS-GOVERNOR 9L6509 - Caterpillar

Module Identifier (MID)
The electronic control module that has detected a failure is identified by the Module Identifier (MID). Each electronic control module on the machine has a unique MID. The MID for the ECM of the Machine Security System is 124.Component Identifier (CID)
The Component Identifier (CID) is a code that describes the component that is believed to have caused the failure.Failure Mode Identifier (FMI)
The codes for the Failure Mode Identifier (FMI) are defined by the Society of Automotive Engineers (SAE). The list of codes in Table 1 is used on Caterpillar products.
Table 1
Descriptions of the Failure Mode Identifiers (FMI)    
FMI No.    Description of Failure    
00     "Data is valid, but above normal operating range"    
01     "Data valid, but below normal operating range"    
02     "Data erratic, intermittent, or incorrect"    
03     "Voltage above normal or shorted high"    
04     "Voltage below normal or shorted low"    
05     "Current below normal or open circuit"    
06     "Current above normal or grounded circuit"    
07     "Mechanical system not responding properly"    
08     "Abnormal frequency, pulse width, or period"    
09     "Abnormal update"    
10     "Abnormal rate of change"    
11     "Failure mode is not identifiable."    
12     "Bad device or component"    
13     "Out of calibration"    Detailed FMI Explanations
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 limit includes signals that are above the expected range. A sensor that is still working but sending a signal above the expected limit will cause an FMI 00 to be stored. Some possible causes of FMI 00 are listed here:
Signal above normal (High pressure or high temperature)
Calibration is needed. FMI 13 is the preferred code.For example, a certain PWM sensor is expected to generate a valid signal over 80 percent duty cycle. If the sensor generates a signal of 81 percent duty cycle, the sensor is still working but the signal is above the expected signal limits. 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 expected range. A low engine oil pressure signal from a working sensor could produce this FMI. A sensor that is still working but sending a signal below the expected limit will cause an FMI 01 to be stored. Some possible causes of FMI 01 are listed here:
The signal is below normal. (The voltage, pressure, or temperature is low.)
Timing is retarded. For example, a certain PWM sensor is not expected to generate a PWM signal below 5 percent duty cycle even with zero air pressure. If the sensor generates a signal of 4 percent duty cycle with the engine shutdown, the sensor is still working but the signal is below the expected signal limits. FMI 02 -