Engine Manual
Table Of Contents
- Safety Precautions and Instructions
- Introduction
- Service Assistance
- Section 1. Components and Maintenance Locations
- Section 2. Operation
- Section 3. Maintenance
- Section 4. Troubleshooting
- Section 5. Storage
- Section 6. Specifications
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Throttle Body
Figure 6 Throttle Body
The throttle body controls the operating speed of the engine according to input from the ECM. Defaults programmed into the
ECM software, along with throttle position sensors, allow the ECM to control the overall operation of the engine in response to
changing speeds and loads.
Engine Control Module (ECM)
Figure 7 Engine Control Module
The ECM is a digital controller that oversees the various operating parameters of the engine. The ECM receives input data from
sensors mounted to the engine and fuel system, and then outputs various signals to adjust engine operation.
The ECM also performs diagnostic functions on the fuel system. If a malfunction occurs, the ECM sends a fault signal to alert
the operator to the problem. A corresponding Diagnostic Trouble Code (DTC) is generated and stored in memory within the
ECM. A technician can then use a computerized diagnostic scan tool to retrieve the stored DTC number(s) and identify the
problem.