MEFI Fuel Injection
Basic System Operation Electronic Speed / Density
INPUTS
OUTPUTS
ECM
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 an input 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-ec system.
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