Automotive Systems Quiz

What is pre ignition in engine systems?

• Ignition of the air-fuel mixture before the spark plug fires

• The process of starting the engine

• The cooling of the engine after use

• The lubrication of engine parts

What is the function of pin 5 in the OBD system?

• Signal Ground

• CAN Low (J-2284)

• J1850 Bus

• Battery power

What is the function of pin 14 in the OBD system?

• Signal Ground

• CAN Low (J-2284)

• J1850 Bus

• Battery power

What is the function of pin 16 in the OBD system?

• J1850 Bus+

• CAN High (J-2284)

• Battery power

• Signal Ground

What happens to the resistance of the NTC sensor as the engine warms up?

• Increases

• Decreases

• Stays the same

• Fluctuates randomly

What happens to the resistance of the PTC sensor as the engine warms up?

• Increases

• Decreases

• Stays the same

• Fluctuates randomly

What does ETC stand for in the context of sensor resistance?

• Engine Temperature Control

• Electronic Temperature Control

• Engine Temperature Coolant

• Electronic Temperature Coolant

What is the expected resistance reading for a PTC temperature sensor at operating temperature?

• Low

• High

• Zero

• Fluctuating

What should be done if the ETC sensor resistance does not match the manufacturer's data?

• Ignore it

• Replace the sensor

• Recalibrate the multimeter

• Check the battery

Why are some wires twisted in pairs?

• They are CAN bus wires and twisting causes interference

• aThey are high voltage and will short out otherwise

• They are low voltage and will gain voltage from each other

• They are CAN bus wires and twisting prevents interference