The following is the procedure to display fault codes.....i take it this is a woodward fuel sytem and an lpg truck????....fault codes will be either a two digit or three digit code that is flashed on the dash lights...maybe more than oone code flashed...let us know what codes are flashed if you can....


Displaying Fault Codes (DFC) From SECM Memory

To enter code display mode you must turn OFF the igni- tion key. Now turn ON the key but do not start the engine. As soon as you turn the key to the ON position you must cycle the foot pedal by depressing it to the floor and then fully releasing the pedal (pedal maneuver). You must fully cycle the foot pedal three (3) times within five (5) seconds to enable the display codes feature of the SECM. Simply turn the key OFF to exit display mode. The code list will continue to repeat until the key is turned OFF. An automatic code display feature is activated if a foot pedal fault condition exists. This feature enables the service technician to view the fault codes by turning the key to the ON position, if a foot pedal malfunction is preventing the retrieval of the stored fault codes from the SECM.