18 SEBU8598 General Information Product Description Electronic Engine Features The Caterpillar C15 and C18 Engine are designed for electronic controls. The integral on board computer controls the operation of the engine. Current operating conditions are monitored. The Electronic Control Module (ECM) controls the response of the engine to these conditions and to the demands of the operator. These conditions and operator demands determine the precise control of fuel injection by the ECM. The electronic engine control system provides the following features:
Engine speed governor Automatic air/fuel ratio control Illustration 14 g01387009 Cylinder and valve location Torque rise shaping (A) Exhaust valve (B) Inlet valve Injection timing control System diagnostics Table 1 Aftertreatment regeneration control NOx reduction system control Additional Features The following additional features provide increased engine fuel economy and serviceability: Cold starting capability Tampering detection (1) Air-to-air aftercooled Diagnostics Table 2 Engine Diagnostics The engine has built-in diagnostics in order to ensure that all of the components are functioning properly. Under certain conditions, the engine horsepower and the vehicle speed may be limited.
A Caterpillar electronic service tool may be used to display the diagnostic code. There are two categories of codes: diagnostic code and event code. These two categories of codes may be in two different states: active and logged. Most of the diagnostic codes are logged and stored in the ECM. For additional information, refer to the Operation and Maintenance Manual, “Engine Diagnostics” topic (Operation Section). (1) Air-to-air aftercooled Engine Service Life Engine efficiency and maximum utilization of engine performance depend on the adherence to proper operation and maintenance recommendations. In addition, use recommended fuels, coolants, and lubricants.
Use the Operation and Maintenance Manual as a guide for required engine maintenance. C15 Engine Specifications Arrangement and Cylinders In-line six cylinder Bore 137 mm (5.4 inch) Stroke 171 mm (6.7 inch) Aspiration ATAAC(1) Displacement 15.2 L (928 cubic inch) Firing Order 1-5-3-6-2-4 Rotation (flywheel end) Counterclockwise C18 Engine Specifications Arrangement and Cylinders In-Line six cylinder Bore 145 mm (5.7 inch) Stroke 183 mm (7.2 inch) Aspiration ATAAC(1) Displacement 18.1 L (1105 cubic inch) Firing Order 1-5-3-6-2-4 Rotation (flywheel end) Counterclockwise