![]() truck with a maxforce 13 engine have code spn 637 fmi 10 ,spn 5548 fmi 7,spn. Only the SPN numbers that are intended to be used on Caterpillar ® products are listed. spn 520249 fmi 4 Spn FmiJohn Deere Engine Fault Codes Spn Fmi Eventually. The Society of Automotive Engineers (SAE) developed the J1939 standards and SPN code terms have been assigned for specific parameters (component or system circuits) that diagnostic trouble codes (DTC) are associated with. ![]() The Suspect Parameter Number (SPN) is diagnostic fault code terminology found on some Caterpillar ® products using a J1939 CAN data link.
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