Sensors, Actuators and Control Units

Open Ended

How do you think advancements in sensor and actuator technology have changed the way vehicles operate today?

Multiple Select

Which of the following sensors can be used as inputs to a control unit?

• Temperature sensors

• Hall sensors

• Potentiometer/pressure sensors

• All of the above

Open Ended

What is the main difference in the output signal between inductive/passive sensors and active/Hall effect sensors?

Multiple Choice

Which voltage reading from a camshaft sensor indicates a resistive fault?

• 0V

• 12V

• 1-11V

• 5V

Open Ended

Explain the difference in signal patterns between camshaft and crankshaft sensors as shown in the diagram.

Multiple Choice

When is the output of a Hall Effect switch at 0V according to the diagram?

• When not actuated

• When actuated

• When shorted to earth

• When open circuit

Open Ended

Describe how the voltage output of a mass air flow sensor changes with increasing air flow, based on the diagram.

Multiple Select

Which of the following statements are true about the voltage readings for sensor faults as indicated in the diagrams?

• 0V indicates short to earth

• 5V indicates open circuit

• 12V indicates short to live

• All of the above

Multiple Choice

Which sensor is responsible for detecting engine knock and what is the typical voltage output pattern observed from it?

• Lambda sensor; smooth voltage curve

• Knock sensor; spiky voltage curve

• Petrol injector; flat voltage curve

• Coil pack; high voltage spike

Open Ended

Compare the waveform patterns of petrol and diesel injectors. What does the difference in their waveforms suggest about their operation?

Multiple Choice

During actuator testing, which injector type shows a waveform with multiple current peaks and oscillations?

• Petrol injector

• Diesel injector

• Lambda sensor

• Knock sensor

Multiple Choice

What is the main difference between a 'Switch Live' and a 'Switch Earth' duty cycle as shown in the diagrams?

• In 'Switch Live', the ON state is at 0V, while in 'Switch Earth', the ON state is at +12V.

• In 'Switch Live', the ON state is at +12V, while in 'Switch Earth', the ON state is at 0V.

• Both have the same ON and OFF states.

• 'Switch Earth' does not use a pull-up resistor.

Multiple Choice

Which of the following statements best describes the purpose of measuring voltage loss in automotive circuits?

• To determine the battery's total voltage.

• To identify excessive resistance or poor connections in the circuit.

• To check the alternator's output.

• To measure the current draw of the starter motor.

Multiple Select

Select all the correct steps involved in measuring voltage loss across a fuse in an automotive circuit.

• Set the multimeter to measure voltage.

• Place the probes across the fuse terminals.

• Turn off the ignition before measuring.

• Interpret the reading based on the fuse rating and voltage loss table.

Open Ended

Explain how an Electronic Control Unit (ECU) processes signals to operate vehicle features without referring to notes.

Open Ended

Reflecting on today's session about sensors, actuators, and control units in modern vehicles, what is one concept you found most interesting or would like to learn more about?