![]() Need Help CAI Provides No-cost Technical Support for the Lifetime of the Product. Only the SPN numbers that are intended to be used on Caterpillar ® products are listed. For CAT Data Link Convert CAT Data Link to Modbus RTU Engines Generators Heavy Equipment Available for J1708/J1587, J1939, or CAT Data Link engines. 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 of our equipment using a J1939 CAN data link. 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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