FRAME AS-SWING 3155384 - Caterpillar

Diagnostic codes are associated with failed electrical components or circuits. These components and circuits provide information to the GSC. Also, these components and circuits receive information from the GSC. The diagnostic code closely identifies the cause of the fault. Each diagnostic code consists of the following indicators that are shown on the upper display: a component identifier (CID), a failure mode identifier (FMI) and a "DIAG" indicator. The CID describes the component in the system that is faulty. The FMI describes the nature of the fault. When the "DIAG" indicator is FLASHING, the fault is active. When the "DIAG" indicator is ON CONTINUOUSLY, the fault is inactive and the CID FMI is recorded in the fault log. To view the fault log, see Systems Operation, "Fault Log Viewing OP1". When the "DIAG" indicator is not present, there are NO diagnostic codes that have been detected or recorded. Service personnel interpret the identifiers in order to assist with troubleshooting. When a diagnostic code is active, the GSC FLASHES the "DIAG" indicator. The GSC determines the type of fault (alarm or shutdown). Then, the GSC FLASHES the corresponding fault alarm indicator or the fault shutdown indicator. For a shutdown fault, the CID FMI is immediately shown on the upper display. For an alarm fault, the alarm codes key must be pressed first. Then, the CID FMI is shown on the upper display. The GSC has a fault log to help with troubleshooting of diagnostic faults. Inactive diagnostic codes (CID FMI) are recorded in the fault log for viewing at a later time. Also, the number of occurrences are totalled. The total number of occurrences is shown on the upper display. An active alarm fault becomes inactive when the fault is no longer occurring. Also, in order for shutdown faults to become inactive, the ECS must be turned to OFF/RESET. See Systems Operation, "Fault Log Viewing OP1". During troubleshooting, it is necessary to disconnect the harness connector (40 contact) from the GSC and faults are created. Because of internal circuitry, the GSC recognizes this condition as a FMI 3 for certain components. This fact is also used as an aid for troubleshooting. Clear these created diagnostic codes after the original diagnostic code is corrected. In a properly operating system, when the harness connector is removed from the GSC, the following diagnostic codes are recorded:
CID 100 FMI 2 pressure sensor (engine oil)
CID 110 FMI 2 temperature sensor (engine coolant)
CID 111 FMI 3 fluid level sensor (engine coolant)
CID 190 FMI 3 speed sensor (engine)
CID 336 FMI 2 switch (engine control)
CID 590 FMI 9 engine ECMYou can avoid confusion in a future service call if you clear a diagnostic fault from the fault log. Clear the diagnostic fault after you have corrected the fault. The "DIAG" indicator is NOT PRESENT when all diagnostic faults are cleared from the fault log and no active diagnostic faults exist. See Systems Operation, "Fault Log Clearing OP4".
Table 1
EMCP II Diagnostic Codes    
CID / FMI    Description