ASE Auto Maintenance and Light Repair
Terms & Definitions
Practice Test
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Constant mesh
In a transmission, where all gears are constantly in contact and turning with one another.
The volume displaced by all of the pistons in all of an engine's cylinders.
Electronic feedback system in which the answers provide constant information on what is taking place in the engine; the state of the engine control computer system when it is working normally, at full operating temperature and normal speeds with the oxygen sensor switching. The fuel injection quantity is determined by the set of inputs from the engine control computer sensors, most specifically the oxygen sensor in the exhaust stream. A closed loop system samples its output and uses that sampling to modify the next inputs.
The proportion of air to fuel by weight in the mixture drawn into the engine.