HARNESS AS-CAB 2262898 - Caterpillar

Troubleshooting Procedures
The diagnostic codes can be viewed with the following systems: the Instrument Cluster and the Caterpillar Electronic Technician (ET). See one of the following references:The following procedures may cause new diagnostic codes to be logged. Therefore, before any procedures are performed make a list of all the active diagnostic codes in order to determine the system problems. Clear the diagnostic codes that were caused by the procedure, when each procedure is complete.Note: Before performing a procedure, always check all the circuit breakers. Repair the cause of any circuit breaker that is tripped.Module Identifier (MID)
System events from other electronic control modules are shown on the monitoring system. Other electronic control modules transfer this diagnostic information on the CAN Data Link to the monitoring system.The module identifier (MID) identifies the electronic control module that detected the diagnostic code. Each electronic control module on the machine has a unique MID. Use the following chart in order to match the MID for each diagnostic code to a specific electronic control module. The chart for the Module Identifier (MID) is located on the Electrical System Schematic for your machine. See the chart if the MID is not shown on the display of your machine. After the operator determines the electronic control module that has detected the diagnostic code, see the service manual module for that particular ECM for more troubleshooting information. The service manual for each ECM is part of the machine's Service Manual.All electronic control modules (ECM) that use the CAN Data Link have a module identifier (MID). The MID is listed for each module:Engine ECM ... 036Chassis ECM ... 081Product Link ... 122Component Identifier (CID)
The component identifier is a four digit number that represents a particular component on the machine. For example, each solenoid that is connected to the Machine ECM has a number that is assigned. See Troubleshooting, "Diagnostic Code List" for a list of all of the components of the machine control system.Failure Mode Identifier (FMI)
The codes for the Failure Mode Identifier are defined by the SAE standards. The following list contains a CAT version of definitions. The diagram that follows will help you understand the use of FMI with sensors.
Table 1
Failure Mode Identifier    
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 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, 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     "Not used"    
15     "Not used"    
16     "Parameter not available"