Hi. Thanks for using JA! I think I can help you out.
Do you have a Caterpillar 3126 or C7 engine?
Also, if your check engine light is coming on, can you get the flash codes for me?
Here are the procedures for pulling Flash codes from the ECM.
Use the diagnostic Lamp or a Caterpillar electronic service tool to determine the diagnostic flash code.
Use the following procedure to retrieve the flash codes if the engine is equipped with a diagnostic lamp:
- Turn the ignition key to the ON position.
- Turn the ignition keyswitch to the OFF position.
- Turn the cruise control ON/OFF switch to the OFF position.
- Move the SET/RESUME switch to either position. Hold that position until the yellow lamp begins to flash.
The yellow lamp will flash in order to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the flash code. After a two second pause, the second sequence of flashes will identify the second digit of the flash code.
Any additional flash codes will follow after a pause. These codes will be displayed in the same manner. Flash Code 55 indicates that No Detected Faults have occurred since the ignition keyswitch has been turned to the ON position.
Edited by Scott on 4/2/2010 at 4:05 PM EST