Level 3 LV07 (Engines)

What is a typical diesel idle pressure?

• 1500-2000 PSI

• 2500 - 3000 PSI

• 3500 - 4000 PSI

• 4500 - 5000PSI

The mass air flow sensor contains a module that heats a wire. What happens to the wires temperature and resistance when air flows over said wire?

• Both increase

• Temp increase, resistance decreases

• Temp decreases, resistance increase

• Both decrease

what is the throttle body Assembly position measured by

• ECU

• Electronic Throttle plate

• Idle control device

• potentiometer

What is pulse width modulation?

• how much fuel comes out of the injector

• The period the injector is open

• order of each injector opening

• all of the above

How would you test the fuel rail delivery line when you receive a open loop on the multimeter

• set the multimeter to 12 volts and test it as is

• isolate the fuel rail and start measuring from the start of the rail to the end of the fuel system until you get a reading

• run a continuity test on the wires from the fuel pump

• replace with a new fuel rail

What happens if injectors are not coded?

• Non start

• running but lumpy

• no problems will occur

• All of the above

Which one of the following components is located on the 'high pressure' side of the diesel fuel injection system?

• Fuel pump

• Fuel tank

• Common Rail

• Fuel filter

What is the 3rd step you would do when your fuel pump is not engaging?

• put your ear to the gas tank and you can hear a activation noise

• check the relay

• do a pressure system check

• check the fuse

What controls the opening and closing of the fuel injector in an electronically controlled fuel injection system?

• It is opened in time with the engine timing directly via the cambelt

• It is controlled by electrical signals from the ECU

• It is controlled by the in-line fuel filter

• It is controlled by the fuel pump in relation to engine timing

What is the first test that can be done when diagnosing a faulty fuel pump.

• Listen for the pump when power is on

• Check the fuse

• Check the battery level

• Check fuel pressure