Caterpillar C15 ECM Wire Diagram (RKS, MXS, NXS. JEP, TRB, & KRA)


Factory printed C15 ECM wire diagram for Cat C15 engines with engine serial numbers beginning with RKS, MXS & NXS.  This wire diagram includes the following information:

1. Wire diagram
2. Wire colors
3. ECM pin numbers & location
4. Sensor torques
5. Fault codes
6. Test procedures


Engine Information:

The C15 is a heavy-duty diesel engine manufactured by Caterpillar. It is intended for fleet and line haul use. Caterpillar has won the J.D. Power and Associates award for “Highest in Customer Satisfaction with Vocational Heavy Duty Diesel Engines” six times. According to Caterpillar, no other engine manufacturer has received this award once.

The Caterpillar C15 is an in-line, six-cylinder diesel engine. The bore by stroke ratio is 5.4 inches by 6.75 inches, or 137 mm by 171 mm. The displacement is 15.2 liters, or 928 cubic inches. The power rating when used in a truck or bus is 435 to 625 horsepower at 2,100 rpm; RV and fire truck ratings are 600 to 625 horsepower at 2,100 rpm. The total torque output is 1,550 to 2,050 foot-pounds at 1,200 rpm. Total weight of the engine is 3,090 pounds.

According to Caterpillar, “laboratory tests and engine disassembly analyses indicate the Cat C15 engines are expected to have a B50 life of one million miles with Cat’s recommended maintenance.” The C15 was built to be compliant with the 2007 Environmental Protection Agency’s diesel emissions regulations. A compressor brake is available on the C15, and it is designed to allow for a simple after-purchase modification to increase horsepower.

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