Engine Management Output Devices Rev Q

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Engine management output devices (Review Questions)

Which way electrically do PCM outputs work?
a) Pulse width modulation
b) Switched
c) Digital
d) Any of the above

d) Any of the above

Transistors used as high-side drivers switch the ___________ side of the circuit.
a) Ground
b) B+
c) Both ground and B+
d) None of the above

...

A digital output would be used to control which of these devices?
a) IAC
b) Purge solenoid
c) Relay
d) Fuel injector

a) IAC (Idle Air Control) valve

What type of signal could be used to control how much vacuum flows through a solenoid?
a) Switched
b) Analog
c) Pulse width modulation
d) Digital

c) Pulse width modulation

The amount of fuel that flows through a fuel injector is controlled by....
a) The amount of voltage to the injector
b) The length of time the injector is turned on
c) The frequency that the injector is turned on
d) Both b and c

d) Both b and c

Electronic throttle controls use an actuator to...
a) Measure throttle position
b) Open and close the throttle plates
c) Move the accelerator pedal
d) None of the above

a) Measure throttle position

Technician A says that you can open and close the throttle plates manually on a vehicle that is equipped with a throttle actuator without causing damage. Technician B says that a scan tool should be used to move the throttle plates. Who is correct?
a) Technician A
b) Technician B
c) Both a and b
d) Neither a nor b

b) Technician B

Transistors used as low-side drivers switch the _________ side of the circuit.
a) B+
b) Ground
c) Both ground and B+
d) None of the above

b) Ground

The idle air control valve is used to control the position of the throttle plates.
a) True
b) False

b) False

On most fuel-injected vehicles the fuel pump should run....
a) When the ignition is on
b) For 2 seconds after the ignition is turned on
c) When an ignition reference signal is received by the PCM
d) Both b and c

d) Both b and c

Technician A says that serial data is an output from the PCM. Technician B says that serial data may also be an input to the PCM. Who is correct?
a) Technician A
b) Technician B
c) Both a and b
d) Neither a nor b

c) Both a and b

On an OBD II equipped vehicle the malfunction indicator lamp may also be called the.....
a) Power loss lamp
b) Emission lamp
c) Check engine lamp
d) Any of the above

c) Check engine lamp

Many newer evaporative systems use solenoids that are controlled by....
a) Vacuum
b) The PCM
c) The evaporative canister
d) None of the above

b) The PCM

Technician A says that many EGR valves are PCM controlled using vacuum solenoids. Technician B says that many EGR valves are electrically controlled by the PCM. Who is correct?
a) Technician A
b) Technician B
c) Both a and b
d) Neither a nor b

b) Technician B

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