TUBE 2W7949 - Caterpillar

Industrial Engines: 3126B (S/N: BEJ1-UP) C-9 (S/N: CLJ1-UP) C-10 (S/N: BCX1-UP) C-12 (S/N: BDL1-UP) C-15 (S/N: BEM1-UP) C-16 (S/N: BFM1-UP)Engine: 3126B (S/N: DCS1-UP)Introduction
This document is intended to provide information for wiring the engine electronics and programming the engine electronics.Important Safety Information
Most accidents that involve product operation, maintenance and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills and tools in order to perform these functions properly.Improper operation, maintenance or repair of this product may be dangerous. Improper operation, maintenance or repair of this product may result in injury or death.Do not operate or perform any maintenance or repair on this product, until you have read and understood the operation, maintenance and repair information.Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The warnings in this publication and on the product are not all inclusive. If a tool, a procedure, a work method or an operating technique that is not specifically recommended by Caterpillar is used, you must be sure that it is safe for you and for other people. You must also be sure that the product will not be damaged. You must also be sure that the product will not be made unsafe by the procedures that are used.The information in this publication was based upon current information at the time of publication. Check for the most current information before you start any job. Caterpillar dealers will have the most current information.
When replacement parts are required for this product Caterpillar recommends using Caterpillar replacement parts or parts with equivalent specifications including, but not limited to, physical dimensions, type, strength and material.Failure to heed this warning can lead to premature failures, product damage, personal injury or death.
System Overview
Note: The 3126B and C-9 Industrial Engines have hydraulically actuated, electronically controlled unit injectors (HEUI). The other Industrial Engines that are covered in this document have mechanically actuated, electronically controlled unit injectors (MEUI).These engines were designed for electronic control. The injection pump, the fuel lines, and the nozzles that are used in mechanical engines have been replaced with a unit injector in each cylinder. A solenoid on each injector controls the amount of fuel that is delivered by the injector. An electronic control module (ECM) sends a signal to each injector solenoid in order to provide complete control of the engine.Electronic Controls
The electronic system consists of the following components: electronic control module (ECM), unit injectors, wiring harness, switches and sensors. The ECM is the computer. The personality module (flash file) is the software for the computer. The personality module (flash file) contains the operating maps. The operating maps define the following characteristics of the engine:
Horsepower
Torque curvesThe ECM determines the timing and the amount of fuel that is delivered to the cylinders. These decisions are based on the actual conditions and the desired conditions