COVER-SHIPPING 2J2668 - Caterpillar

Many programmable parameters affect 3100 HEUI Engine operation. These parameters may be changed using Electronic Service Tools. The parameters are stored in the ECM, not the Personality Module. Any parameter can be read. However, passwords protect parameters from authorized changes.These are two categories containing various parameters, System Configuration Parameters and Customer Specified Parameters.System Configuration Parameters can be altered only with the proper factory passwordsusing Caterpillar Electronic Technician (ET).Customer Specified Parameters can be changed using an Electronic Service Tool only with the proper customer passwords.Refer to "Passwords" on page 33 for more details on how to receive and use factor and customer passwords. For details on how to read and change parameters using a CAT ET, refer to the Caterpillar Electronic Technician, Getting Started Manual, included with the software.Connecting an Electronic Service Tool
ET and the Communications Adapter are powered by 12 volts DC from the vehicle battery. This permits operation near the engine compartment or in the cab, to obtain readings during vehicle operation.Use the following procedure to connect the service tool to the engine.1. Turn the ignition key to the OFF position.2. The Electronic Service Tool should be connected to the 3100 HEUI system through the Cab Data Link connector. Determine the necessary Adapter Harness Assembly from the service tool list for the vehicle you are working with. Connect the appropriate adapter to the 139-4166 Breakout T harness connector cable.3. Connect the opposite end of the Breakout T cable to the Electronic Service Tool.4. Turn the ignition key to the ON position to begin testing. The Service Tool will operate with the engine running, or with the engine OFF, ignition key ON. If the Tool does not communicate with the 3100 HEUI ECM, refer to "PB-21: ATA (SAE J1587/1708) Data Link Circuit Test" on page 145. The Service Tool may restart during engine cranking due to a voltage dip on the battery line.System Configuration Parameters
System Configuration Parameters affect emissions or rated power of the engine. They are programmed at the factory and would normally never need to be changed through the life of the engine. System Configuration Parameters mustbe reprogrammed if an ECM is replaced. Proper values for these parameters are stamped on the Engine Information Plate, located on the valve cover or intake manifold. Factory Passwordsare required to change these parameters. The following is a description of the System Configuration Parameters.Full Load Setting
Number representing fuel system adjustment made at the factory to "fine tune" the fuel system. The correct value for this parameter is stamped on the Engine Information Plate. A new ECM must have this parameter programmed to avoid generating a Diagnostic Code 253-02 Check Customer Or System Parameters (56).Full Torque Setting
Similar to Full Load Setting. This parameter must be programmed or a Diagnostic Code 253-02 Check Customer Or System Parameters (56) will be generated.Personality Module Code
This code prevents use of incorrect personality module for this engine. Each power rating family and emission certification has a different code associated with it. When a personality module is