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ELECTRONIC CONTROL UNIT (ECU)
Related Terms
��Computerized Engine Controls
��Electronic Fuel Injection (EFI)
��Module
��Multi-port injection (MFI)
��Throttle Body Injection (TBI)

Definition: The Electronic Control Unit (ECU) controls the fuel injection system, ignition timing, and the idle speed control system. The ECU also interrupts the operation of the air conditioning and EGR systems, and controls power to the fuel pump (through the control relay). The ECU consists of an 8-bit microprocessor, random access memory (RAM), read only memory (ROM), and an input/output interface.

Based on information from the input sensors (engine coolant temperature, barometric pressure, air flow, etc.), the ECU determines optimum settings for the output actuators (injection, idle speed, ignition timing, etc.).

Related Resources:

Making Sense of Sensors: Part 1
There are a lot of things going on in your engine as you drive. A lot of information is taken in and processed. But how is this information gathered and what happens to it once it's collected?

Making Sense of Sensors: Part 2
There are a lot of things going on in your engine as you drive. A lot of information is taken in and processed. But how is this information gathered and what happens to it once it's collected?

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