Programmable Relay Control Module (PRCM) Caterpillar

Note: Refer to Troubleshooting, "Troubleshooting Diagnostic Codes" of the PRCM for additional information.

Fault Identification Procedure

Diagnostic codes or alarms that are detected by the PRCM are shown in the display area of the PRCM. The PRCM uses the LED displays and diagnostic codes on the upper display in order to inform service personnel about a specific problem. Perform the following procedure in order to identify the diagnostic code that was detected by the PRCM.

Illustration 1	g00713266
Display area of the Programmable Relay Control Module (1) Red LED display of the programmable alarm (2) Red LED display of the internal alarm fault (3) Yellow LED display of the alarm fault (4) Keypad (5) Lower LCD display (6) "CID", "DIAG", "FMI", "PROG", and "COUNT" (7) Upper LCD display

1. Determine the LED display that is active on the left side of the PRCM (1), (2), or (3).

2. View the diagnostic code on upper display (7) of the PRCM. If necessary, press the "MODE" button in order to obtain the Diagnostic Code Viewing/Clearing screen.

3. The status of the "DIAG" display area (6) :
   • BLANK

   • FLASHING

   • CONTINUOUSLY ON

4. Use the first column of table 1 and identify a condition from step 3. Then, locate the alarm fault indicator that is activated.

5. Use the second column of table 1 and find the diagnostic code that is shown on the upper display.

6. Use the third column of table 1 which describes the status of the "DIAG" indicator.

7. Read the last column in order to find the type of diagnostic code. Refer to Troubleshooting, "Troubleshooting Diagnostic Codes" of the PRCM for additional information.

Note: See Testing and Adjusting, "Electrical Connector Inspect" in order to troubleshoot connectors. This procedure is useful for problems that are intermittent.