CORE AS-RDTR 5234592 - Caterpillar

Procedure For Clearing Diagnostic Codes
Turn the ECS to the STOP position in order to shut down the engine. Enter service mode and enter the password. "OP 1" is showing on lower display. See Systems Operation, "Service Mode" for more information. See Systems Operation, "Password Entry OP3" for more information.
Press "SCROLL UP" key three times. "OP 4" is showing on the lower display.
Press "SELECT" key. A diagnostic code and the number of occurrences are showing. The lower display shows the value of the hourmeter of the last occurrence.
Press "SELECT" key. The diagnostic code will flash. The count and the value for the hourmeter will also flash.
Press and hold "ENTER" key for two seconds. If there is only one diagnostic code, the CID FMI that was flashing disappears and the upper display is blank except for the flashing "SERV" indicator. "OP 1" is showing on the lower display. Go to the next step. If there is more than one diagnostic code, the CID FMI that was flashing disappears. The upper display shows the next CID FMI with the corresponding count and the value for the hourmeter. Repeat steps 4 and 5 until all diagnostic codes are erased. The lower display then shows "OP 1". Go to the next step.
Press "EXIT" key. "OP 1" is showing on lower display.
Press "EXIT" key. The display will return to the normal mode.