Legacy Postal Wagon AWD F4-2.2L SOHC (1998)
Engine Control Module: Description and Operation
PURPOSE/OPERATION
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The Engine Control Unit (ECM) receives signals emitted from various sensors to control the amount of fuel injected and the fuel injection timing.
Sequential fuel injection control is utilized over the entire engine operating range except during standing starts.
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The amount of fuel injected by the injector valve is dependent upon the length of time it remains open. The optimum fuel injection timing is
determined by transmitting a signal to the injector from the Engine Control Module (ECM) according to varying engine operations. Feedback
control is also accomplished by means of a learning control. As a result, the fuel injection control system is highly responsive and accurate in
design and structure.
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The sequential fuel injection system is designed so that fuel is injected at a specific time to provide maximum air intake efficiency for each
cylinder. In other words, fuel injection is completed just before the intake valve begins to open.
1. Fuel injection characteristics.
Fuel injection timing is basically expressed as indicated below:
a. During engine starts:
