WHEEL-COMPRESSOR 4N6861 - Caterpillar

Diagnostic codes are associated with failed electrical components or circuits, that provide information to the GSC+. Diagnostic codes are also associated with failed electrical components or circuits, that receive information from the GSC+. The diagnostic code closely identifies the cause of the problem.Each diagnostic code consists of the following items: a component identifier (CID), a failure mode identifier (FMI) and "DIAG" indicator. These items are shown on the upper display. The diagnostic code indicator can be active or inactive. The CID identifies the component that has a problem. The FMI describes the nature of the diagnostic code. When the "DIAG" indicator is FLASHING, the diagnostic code is active. This means that the diagnostic code is present. When the "DIAG" indicator is ON CONTINUOUSLY, the diagnostic code is inactive and the CID FMI is recorded in the fault log. See Systems Operation, "Fault Log Viewing OP1" in order to view the fault log. When the "DIAG" indicator is not showing, there are NO diagnostic codes that are detected or recorded. Service personnel interpret the identifiers in order to assist with troubleshooting.When a diagnostic code occurs, the GSC+ FLASHES the "DIAG" indicator. The GSC+ determines the type of problem that is represented by the diagnostic code. There are two types of problems: an alarm fault and a shutdown fault. Then, the GSC+ FLASHES the corresponding fault alarm indicator or fault shutdown indicator. The CID FMI is immediately shown on the upper display when there is a shutdown fault. When there is an alarm fault, the "alarm codes" key is pressed first. Then, the CID FMI is shown on the upper display.The GSC+ has a fault log to help with troubleshooting of diagnostic codes. Inactive diagnostic codes (CID FMI) are recorded in the fault log for viewing at a later time. The total number of occurrences are shown on the upper display together with the CID and the FMI. An active alarm fault becomes inactive when the problem is no longer occurring. Also, the engine control switch (ECS) should be turned to the OFF/RESET position for shutdown faults. The "DIAG" indicator is FLASHING when the problem is currently occurring. The "DIAG" indicator is ON CONTINUOUSLY when a previous problem existed, but the"DIAG" indicator is inactive at the present time. See Testing And Adjusting, "Fault Log Viewing OP1".During troubleshooting, it is sometimes necessary to disconnect the harness connector from the GSC+ and diagnostic codes are created. Because of internal circuitry, the GSC+ recognizes this condition as a FMI 03 or FMI 02 for certain components. An FMI 03 or FMI 02 describes the voltage that is above normal. This fact is also used as an aid in the troubleshooting process. Clear these created diagnostic codes after the particular diagnostic code is corrected and the diagnostic code is cleared. The following diagnostic codes are recorded in a properly operating system when the harness connector is removed from the GSC+.CID 0100 FMI 02 -