The flashcards below were created by user
JMR
on FreezingBlue Flashcards.
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The EEPROM located in a computer allows stored information to be electrically changed.
True
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The instrument panel warning light is called a DTC.
False. MIL
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A multiplex wiring system prevents separate modules from sharing data.
False. It allows
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Computers are able to receive and process only analog signals.
False. Digital signal
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DTC refers to the diagnostic test connector.
False. Diagnostic Trouble Codes
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Which of the following is a basic function(s) of a computer?
Store information, process information, and send out commands
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Which of the following provides input signals to the PCM?
Feedback devices
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Tech A says the primary purpose of a multiplexing system is to send and receive multiple analog signals. Tech B says multiplexing uses bus data links. Who is correct?
B only. Multiplexing = digital, Nonmultiplexed = analog
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Tech A says static electricity can be discharged safely through a ground wrist strap to prevent damage to sensitive electronic components. Tech B says to avoid touching bare metal contacts to prevent damage. Who is correct?
Both
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A typical PCM is capable of doing all of the following except:
Produce input data
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Which of the following PCM memory circuits is used to store specific calibration information?
PROM = programmable read only memory
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Control loop operation enables the engine to make rapid adjustment to match changes in engine:
Temperature, load, speed
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Which of the following is a computer-controlled actuator?
EGR vent solenoid, EVAP canister purge solenoid, AIR bypass solenoid.
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Tech A says the oxygen sensor provides the major input during open loop mode. Tech B says the engine coolant temperature sensor does not affect open loop mode operation. Who is correct?
Neither
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While discussing PCM memory, Tech A says the RAM normally contains the specific information about the vehicle in which it is installed. Tech B says EEPROM is erased if the power source is disconnected. Who is correct?
Neither
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Tech A says the MAP sensor input is used to control the fuel and EGR systems. Tech B says the MAP sensor is used to control the ignition and idle speed systems? Who is correct?
Both
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Pulse width is being discussed. Tech A says that pulse width is the on and off cycling of an electrical circuit. Tech B says the cycling time varies depending upon the needs of the output circuit. Who is correct?
Neither. Pulse width is only "on" cycling.
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Tech A says an air conditioning pressure switch is used as a PCM input to determine engine load and control engine idle speed. Tech B says the air conditioning switch measures barometric pressure and sends a altitude input signal to the PCM. Who is correct?
A only. MAP sensor measures barometric pressure
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Which of the following is best checked with an ohmmeter?
ECT sensor, MAP sensor, barometric pressure sensor
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The MIL is illuminated when the:
- Ignition is on and the engine is off
- Engine is being cranked
- Engine is running and a DTC has been recorded
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