For example, it will provide information such as wire size and color, which components need to be connected in order for the system to work properly, and any potential compatibility issues that may arise. That system is very similar to what's on the 7.3L Powerstroke. All the 3116's that I have ever seen had mechanical injection, most of the 3126's are the E model, which use HEUI injection. Only the SPN numbers that are intended to be used on Caterpillar ® products are listed. In addition to providing a detailed graphical representation, the Cat 3126 Ecm Wiring Diagram also includes helpful notes and warnings. 3 (Edited) The 3126 is a slightly larger version of the 3116 (6.6L vs. both check out with the data wires from ecm to data link with. have checked batteries and the wires from data link connector to ecm. every time I hook our computer with CAT ET installed on it the truck will shut off while it is trying to detect an ecm. The 300 HP series of 3116 were the least problem of all the 31xx series engines. I am working on a cat 3126 that is in a military truck. Cat should have a record if your engines were part of any warranty issue. Cat repaired all the 3126 soft block engines under warranty and those that failed did so in the first 500-600 hours. 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. However, both 31 engines have had some problems. 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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