ALTERNATOR GP 1753123 - Caterpillar

Using The ECAP and Communication Adapter Tool to Display ("CID-FMI" type) ACTIVE or LOGGED Diagnostic Codes:
A. With key OFF, connect an ECAP and Communication Adapter tool into the 3508 EUI system at the CAT data link connector, located behind the operator's left elbow, on the back panel of the cab. Turn key ON (engine does not need to be started to view codes).B. Refer to the Tool Operating Manual SEHS9343 for the ECAP Service Program Module and Tool Operating Manual SEHS9264 for the Communication Adapter tool. On the ECAP, the display menu will direct you to the proper screen to display diagnostic messages (Figure 4.0).Using the Throttle Backup/Diagnostic Enable Switch And Check Engine Lamp to Display ("Flash" type) ACTIVE Codes:
A. Turn key ON (engine does not need to be started to view codes). Push the Throttle Backup/Diagnostic Enable Switch down and release it.B. If the lamp was not on (no ACTIVE Diagnostics present), the Check Engine Lamp will flash a Code 55 - no Diagnostics present. If the lamp was ON (ACTIVE Diagnostic present) then it will stay on for five seconds more and then the lamp will begin to flash the first number of the two-digit code (count the flashes). After one second OFF, it will begin to flash the second digit. If two or more codes are present, they will follow the first after three seconds and be displayed in the same manner.The Check Engine Lamp will flash out all the codes that are currently active.ACTIVE Diagnostic Codes
Diagnostic codes are used by the 3508 EUI system to warn the vehicle operator of a problem and indicate to the service technician the nature of the problem. Some codes are used only to record an event, and do not indicate problems.An ACTIVE Diagnostic code represents a problem that should be investigated and corrected AS SOON AS POSSIBLE. Repairing the cause of an ACTIVE code will cause the code to be cleared.When an ACTIVE code is generated, the Check Engine Lamp will turn ON and remain ON for at least five seconds. If the condition generating the Diagnostic occurs only for a brief moment, the lamp will go OFF after five seconds and the Diagnostic will be LOGGED.To troubleshoot an ACTIVE code, refer to the cross-reference table in this section under the specific Diagnostic CID-FMI code number. The code number will direct you to a procedure in Section 5.3500 EUI: ECAP "Display Diagnostics" Screen
Figure 4.0LOGGED Diagnostic Codes
When the ECM generates a diagnostic code, it usually logs the code in permanent memory within the ECM. The ECM has an internal diagnostic clock and will record the hour of the first occurrence, the hour of the last occurrence and the number of occurrences of the event. Knowing when and how often the code was generated can be a valuable indicator when troubleshooting intermittent problems. Logged codes can be retrieved or erased using an ECAP service tool (Figure 4.0).Those logged diagnostic codes will automatically be deleted if no additional occurrences are recorded