ASE A8 Quiz 3

An engine has reached normal operating temperature. A graph of a four-wire oxygen sensor signal cycles between .150 Volt and .850 Volt. Which of the following is correct?

A. This oxygen sensor contains a heater circuit

B. The oxygen sensor has failed and is biased/stuck rich

• Answer A

• Answer B

• Both

• Neither

A vehicle emissions test indicates high levels of NOx nitrogen oxides. Which of the following is MOST likely causing this condition?

• A leaking fuel injector

• A bad ignition coil

• A random misfire

• A stuck closed EGR valve

A technician is using a digital multimeter to perform a voltage drop test on a ground circuit. Tech A says to set the meter for measuring ohms, and voltage must present in the circuit. Tech B says a voltage drop test will test for excessive resistance in a circuit. Who is correct?

• Tech A

• Tech B

• Both

• Neither

The PCV valve has been removed from an engines valve cover and makes a rattling sound when shaken. Which of the following statements is correct?

• The PCV valve is colgged

• The PCV valve has a broken spring

• The PCV valve is stuck open

• This is normal

An engine with an electronic ignition system has no spark at any of the ignition coils. Which of the following is causing this no-start condition?

• A clogged air filter

• A faulty fuel pump

• A faulty Crankshaft Position Sensor

• A faulty EGR valve

A vehicle's engine has a rough idle and difficulty starting. It also has a check engine light and fault codes indicating a problem with the enhanced evaporative emission system. Which of the following is MOST likely to result in this condition?

• A clogged charcoal canister

• A faulty purge solenoid

• A faulty fuel level sensor

• An open vent valve

Cylinder #1 on a four cylinder engine is disabled. There is a slight drop in engine RPM. Technician A says the engine should stumble when the cylinder is disabled. Technician B says there should be a significant drop in RPM during this test. Who is correct?

• Tech A

• Tech B

• Both

• Neither

An engine is misfiring and stumbling at idle. Which of the following is most likely the cause of this condition?

• Faulty (TPS)

  Throttle Position Sensor

• Faulty (IAT)

  Intake Air Temperature Sensor

• Faulty (EGR) Exhaust Gas Recirculation Valve

• Faulty (ECT)

  Engine Coolant Temperature Sensor

The turbocharger's wastegate diaphragm is leaking. This leak will result in:

• An underboost condition

• An overboost condition

• Low intake manifold pressure

• Oil consumption

An engine with SFI sequential fuel injection, has poor fuel mileage. A fuel pressure test indicates high fuel pressure at the fuel rail. Which of the following is LEAST likely to result in this condition?

• A kink in the fuel return line

• A ruptured fuel regulator diaphragm

• A clogged fuel injector

• A disconnected fuel regulator vacuum hose