ASE Auto Maintenance and Light Repair
Terms & Definitions
Practice Test
Question
1
of
3
94% Get this Question Right
Exhaust gas recirculation system
A sensor that works by a negative coefficient thermistor, which loses resistance as its temperature goes up just like the intake air temperature sensor. When the computer applies it's a 5 V reference signal to the sensor, this voltage is reduced through a ground circuit by an amount corresponding to thetemperature of the engine coolant.
A transmission that changes forward gears automatically.
Helps prevent the formation of oxides of nitrogen by recirculating a certain amount of exhaust as in inert gas through the intake manifold to keep deep peak combustion temperatures below what would form those chemical compounds. The computer determines when and how much exhaust to recirculate based on information from all its other sensors. It then actuates the EGR solenoid, which opens a vacuum circuit or operates and electronic circuit to actually work the EGR valve. The computer uses a dual cycle signal to activate the solenoid.
Flexible, impermeable membrane on which pressure at to produce mechanical movement; in automotive terminology, any disc shaped device; can be as diverse as thin membranes that separate two chambers and a component, and large metal disc that activate clutch pressure plate.