Basic System Operation Electronic

Speed / Density

Inputs Outputs

For diagnostic purposes there are only 5 parts to the entire system:

1: The necessary INPUTS

2: The wiring for those inputs (from the input to the ECM)

3: The ECM (the control device or decision maker)

4: The necessary outputs

5: The wiring for those outputs (from the ECM to the output) Any electrical problem has to occur in one of those five areas !

Types of Inputs and Outputs:

Direct Inputs: Direct inputs are inputs hardwired to the module.

Direct Outputs: Direct outputs are outputs hardwired to the module.

Indirect Inputs: These are inputs hardwired to some other module but used as aninput to this module. They are received over a bus communication system.

Indirect Outputs: These are output messages or requests over a bus system to another controller

Examples of these are shown on the next page using and EVC-ecsystem.