L3 - 7270/7290 - 157 Diagnose - Rectify Engine Faults

Which one of the following sensors is shown in the image shown below?

• Knock sensor.

• Pressure sensor.

• Camshaft sensor.

• Engine speed sensor.

Using the image shown below, what would occur if number “3” pulse width was extended?

• Less fuel injected.

• More fuel injected.

• Shorter fuel duration.

• Longer spark duration.

When testing the exhaust gas of an engine it is found to contain an excessive amount of hydrocarbons. What would be the most likely cause?

• A defective spark plug.

• A leaking head gasket.

• A leaking inlet manifold.

• A defective catalytic converter.

Which of the following tools would be used to check the serviceability of an electronic fuel injector?

• An ammeter.

• An ohmmeter.

• A compression tester.

• A cylinder leakage tester

On a sequential fuel injection system, the injectors are operated

• on the exhaust stroke

• by the fuel pump system

• on the fuel return sequence

• with the engines firing order.

Which engine sensor uses a piezo resistive crystal?

• Cam shaft sensor.

• Mass air flow sensor.

• Engine knock sensor.

• Manifold absolute pressure sensor.

A throttle Potentiometer is used to provide information on

• speed

• position

• pressure

• temperature.

One advantage of using a multiplexing/CAN system is it

• reduces the amount of cable required

• reduces the number of ECUs required

• increases the amount of cable required

• increases the diameter of cable required.

When subjected to heat, a negative temperature coefficient (NTC) sensor's internal resistance will

• read infinity at all temperatures

• increase as temperature increases

• remain constant at all temperatures

• decrease as temperature increases.

What conditions are oxides of nitrogen produced in a combustion chamber?

• When low octane rating fuel is used.

• When excessive fuel pressure is created.

• When low combustion temperatures occur.

• When high combustion temperatures occur.