Engine Performance TEST Questions and Answers Already Passed

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Engine Performance TEST Questions and Answers Already Passed NB: All answers appear above the respective questions (Answers are above the questions). Electromagnetic induction Which term describes ... the principle used to create high voltage from low voltage? Both Technicians A and B Technician A says that platinum tipped spark plugs should never be re-gapped after being used in a running engine. Technician B says that spark plugs should not be removed from a hot cylinder head. Which technician is correct? True Some engines that use a gasoline direct injection system also have port injection. Both Technicians A and B Technician A says that most fuel injection systems use the PCM to control the pulsing of the fuel injectors. Technician B says that most fuel injection systems use the PCM to control the operation of the fuel pump relay. Which technician is correct? The injectors can be noisy, due to high fuel pressure A characteristic of GDI (Gasoline Direct Injection) systems that could cause a customer concern is ________. False The fuel pickup tube is part of the filler tube assembly (True or False) Both Technicians A and B A fuel pump is being replaced for the third time. Technician A says that the gasoline could be contaminated. Technician B says that wiring to the pump could be corroded. Which technician is correct? Optical sensor Which switching device uses LEDs? High pressure pump In a GDI (Gasoline Direct Injection) engine, the tank fuel pump delivers fuel to the _____________. Defective valve stem seals Which of the following could cause oil fouled spark plugs? False Testing an ignition coil for resistance will always indicate its condition. (True or False) Both Technicians A and B Technician A says that fuel tanks on 1993 and later vehicles use a check ball to prevent siphoning gasoline through the filler neck. Technician B says that methanol is considered a poison. Which technician is correct? True A GDI (Gasoline Direct Injection) system can be used to start an engine without the need for a starter motor. (True or False) DI (Distributor ignition) systems HEI (High Energy Ignition) and EI (Electronic Ignition) are examples of ________. The fuel itself The high pressure fuel pump is cooled by ________. Inertia Switch Which type of safety device will keep the electric fuel pump from operating if it is tripped? An electric pressure control valve The high pressure fuel pressure is regulated by using ________. Vapor Lock What happens when fuel lines get too hot and only fuel vapors go through the fuel injectors? Technician B only Technician A says that fuel pump modules are spring-loaded so that they can be compressed to fit into the opening. Technician B says that they are spring-loaded to allow for expansion and contraction of plastic fuel tanks. Which technician is correct? The camshaft The high pressure fuel pumps used in GDI (Gasoline Direct Injection) systems are powered by ________. 0.6 to 0.8 gallons A good fuel pump should be able to supply how much fuel per minute? Closed Loop Mode Which term describes the PCM (PowerTrain Control Module) using O2 (oxygen) sensor feedback to control fuel delivery? Seamless steel tubing or Nylon plastic Fuel lines are constructed from ________. False Ignition systems may be disabled by removing the secondary wire from the ignition coil. (True or False) Electronic Returnless Systems Which type of port fuel-injection system uses a fuel temperature and/or fuel-pressure sensor? True The primary coil windings are designed for higher current (2-6 Amperes). (True or False) False Engine speed and position sensors only affect the ignition system. (True or False) True Turning off the low voltage primary coil induces a high voltage in the secondary windings. (True or False) Notched ring or pointed wheel A Reluctor is a ________. Both Technicians A and B Technician A says that ignition timing cannot be adjusted on waste spark ignition systems. Technician B says that most waste spark systems use a crankshaft position sensor. Which technician is correct? Pickup Coil The ________ sends a pulse signal to an electronic ignition module. Transistor What is the name of the electronic component inside the ignition module that opens and closes the primary ignition circuit? The Injector itself and/ or Carbon on the intake valves A lack of power from an engine equipped with gasoline direct injection could be due to ________. Clear Flood Mode Which term describes the PCM (Powertrain Control Module) shutting off fuel injection when the accelerator is pressed all the way down? At the outlet of the fuel rail Where is the fuel-pressure regulator located on a vacuum-biased port fuel-injection system? 0.4 ms At idle the injector pulse width of a GDI (Gasoline Direct Injection) injector is about ________. Reduces electromagnetic interference Coil-on-plug ignition systems have which of the following advantages over waste spark systems? Both Technicians A and B Technician A says low power on acceleration is a symptom of a restricted fuel filter. Technician B says loss of high speed engine performance is a symptom of a restricted fuel filter. Which technician is correct? Three (3) How many ignition coils should you expect to find on a V6 engine using a waste spark system? Hall-effect switch Which switching device uses a shutter blade and sensor to detect a magnetic field? False Inline fuel filters may be installed in either direction (True or False) To create an equal pressure drop across the injectors Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines? 1 to 3 Typical primary coil resistance specifications usually range from ________ Ω Detect rich or lean air-fuel mixture / spark knock / misfire An ion-sensing ignition system allows the ignition system itself to be able to ________. Fires one spark plug with reverse polarity and the other plug with straight polarity, and also fires two spark plugs at the same time A waste-spark-type ignition system ________. 500 to 2,900 psi The fuel injectors on a GDI (Gasoline Direct Injection) engine operate under a fuel pressure of about ________. Pickup coil Which switching device creates its own electrical voltage pulse? Technician B only Technician A says that the primary coil has more windings. Technician B says that the secondary coil has more windings. Which technician is correct? Direction of rotation of the coil windings Coil polarity is determined by the ________. Speed Density Which fuel-injection system uses the MAP (Manifold Absolute Pressure) sensor as the primary sensor to determine the base pulse width? TP (Throttle Position) Which sensor has the greatest influence on injector pulse width besides the MAF (Mass Air Flow ) sensor? No air is around the motor brushes What prevents the fuel pump inside the fuel tank from catching the gasoline on fire? True Most ignition systems work by switching the circuit grounding the ignition coil's primary windings. (True or False) Both Technicians A and B Technician A says that a defective crankshaft position sensor can cause a no-spark condition. Technician B says that a faulty ignition control module can cause a no-spark condition. Which technician is correct? Inductive Reactance Because of ________, an ignition coil cannot be fully charged (reach magnetic saturation) until after a delay of about 10 ms. Technician B only Technician A says that the cylinder head and piston design of a GDI (Gasoline Direct Injection) engine is the same as in a port injected engine. Technician B says that a GDI (Gasoline Direct Injection) engine uses specially shaped pistons. Which technician is correct? 6,000 to 30,000 Typical Secondary Coil resistance specifications usually range from ________ Ω. reduce noise Dampeners are used on some fuel rails to ________. Technician B only Technician A says that the primary and secondary ignition systems are never connected. Technician B says that the primary and secondary windings are connected in some ignition coils. Which technician is correct? Directly into the combustion chamber Where is the fuel injected in an engine equipped with GDI (Gasoline Direct Injection)? 50 to 90 volts The fuel injectors used on a GDI (Gasoline Direct Injection) system are pulsed on using what voltage? Rich Fuel Mixture Which of the following would cause carbon fouled spark plugs? Both Technician A and B Technician A looks for engine speed (RPM) when cranking an engine that will not start. Technician B says that a problem in the primary circuit could make the tachometer not work. Which technician is correct? 20 microns Most fuel filters are designed to remove particles larger than ________. Higher When compared to conventional port fuel injection, a GDI (Gasoline Direct Injection) equipped engine has a ________ compression ratio. Spark plug wiring The primary (low-voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is NOT in the primary ignition circuit? Technician B only Technician A says to use a normal spark plug when checking for spark. Technician B says that a spark tester should be used to check for spark. Which technician is correct? Technician B only Technician A says that the port fuel injection injectors operate using five volts from the computer. Technician B says that sequential fuel injectors all use a different wire color on the injectors. Which technician is correct? Technician A only Technician A says to check for spark from the ignition coil first when diagnosing a no-start condition. Technician B says to check the engine CAM sensor first to diagnose a no-spark condition. Which technician is correct? Two (2) seconds On a most cars how long will the fuel pump run if the ignition is turned on but the engine is not started? Signals the electronic control unit (module) The pulse generator ________ Lower power at higher engine speeds and loads A fuel filter has been accidentally installed backwards. What is the most likely result? Reduces noise Why are some fuel rails rectangular in shape? 50 to 60 psi The fuel pump inside the fuel tank on a vehicle equipped with GDI (Gasoline Direct Injection) produces about what fuel pressure? Both Technicians A and B Two technicians are discussing distributor ignition. Technician A says that the pickup coil or optical sensor in the distributor is used to pulse the ignition module (igniter). Technician B says that some distributor ignition systems have the ignition coil inside the distributor cap. Which technician is correct? An electric pressure-control valve The high-pressure fuel pump pressure is regulated by using __________. True A GDI (Gasoline Direct Injection) system can be used to start an engine without the need for a starter? (True or False) True Some engines that use the GDI (Gasoline Direct Injection) system also have Port Fuel Injection? (True or False) Stratified Which mode of operation results in a richer air-fuel mixture near the spark plug? 500 to 2900 PSI The fuel injectors in a GDI (Gasoline Direct Injection) operate under a fuel pressure of about ? 50-60 PSI The fuel pump inside the fuel tank on a vehicle equipped with GDI (Gasoline Direct Injection) produces circa what fuel pressure? O2 sensor The sensor that must be warmed up and functioning before the engine management computer will go to closed loop is the _____ Relatively low (close to zero volts) The voltage output of a zirconia oxygen sensor when the exhaust stream is lean (excess oxygen) is ____. On the same bank where # 1 cylinder is located. In the exhaust system upstream of the catalytic converter Where is sensor 1, bank 1 located on a V-type engine? 3-4 A heated zirconia oxygen sensor will have how many wires Rich exhaust A high O2S voltage could be due to a ______ Lean exhaust or a Defective spark plug wire A low O2S voltage could be due to a _______ Technician A only An oxygen sensor is being tested with a DMM using the MIN/MAX function. The readings are min = 78 mV, max = 932 mV, and average = 442 mV. Technician A says that the engine is operating correctly. Technician B says that the oxygen sensor is skewed too rich. Which technician is correct? 1 to 5 An oxygen sensor is being tested using a digital storage oscilloscope. A good oxygen sensor should display how many switches per second? Less than 100 ms When testing an oxygen sensor using a digital storage oscilloscope, how quickly should the voltage change when either propane is added to the intake stream or a vacuum leak is created? Both Technicians A and B A P0133 DTC is being discussed. Technician A says that a defective heater circuit could be the cause. Technician B says that a contaminated sensor could be the cause. Which technician is correct? 1992 A wide-band oxygen sensor was first used on a Honda in what model year? 10:1 to 23:1 A wide-band oxygen sensor is capable of detecting the air-fuel mixture in the exhaust from _____(rich) to ____(lean) Cup and Planar A conventional zirconia oxygen sensor can be made with what designs? Dual cell and single cell A wide-band oxygen sensor can be made using what design? 8 to 10 A A wide-band oxygen sensor heater could draw how much current (amps)? 1,400°F / 760°C A wide-band oxygen sensor needs to be heated to what operating temperature? Air reference and Diffusion The two internal chambers of a dual-cell wide-band oxygen sensor include? Negative When the exhaust is rich, the PCM applies a ____ current into the pump cell. Scan tool / Voltmeter / Scope A dual-cell wide-band oxygen sensor can be tested using a ____ 1 If the air-fuel rations is 14.7:1, what is lambda? Air-fuel mixture is within 2% of stoichiometric. Air-fuel mixture is slightly rich If lambda is 0.98, this means the ______. Computer calculations. Input from many sensors, except the oxygen sensor Base pulse width is determined by _____? 21% oxygen The air at high altitude has ______. Oxygen in the exhaust system from the oxygen sensor In a speed density system, what does NOT need to be corrected for? Milliseconds (ms) Injector pulse width is measured in ______ Both Technicians A and B Technician A says that the fuel-pump relay is usually controlled by the PCM (Powertrain Control Module) Technician B says that a TBI (Throttle Body Injector) squirts fuel above the throttle plate. Which technician is correct? Both Technicians A and B Fuel-injection service is being discussed. Technician A says that the throttle plate(s) should be cleaned. Technician B says that the fuel rail should be cleaned. Which technician is correct? Stalls / Rough idle / Hesitation on acceleration If the throttle plate needs to be cleaned, what symptoms will be present regarding operation of the engine? CO2 (carbon dioxide) Which gas is generally considered to be the lean indicator? (The higher the level of this gas, the more efficient the engine operates.) CO (carbon monoxide) Which gas is generally considered to be the rich indicator? (The higher the level of this gas, the richer the air-fuel mixture.) HC (Hydrocarbons) All of the gases are measured in %'s except _____? Both Technicians A and B Technician A says that carbon inside the engine can cause excessive NOx to form. Technician B says that excessive NOx could be caused by a cooling system fault causing the engine to operate too hot. Which technician is correct? NOx A clogged EGR passage could case excessive ______ exhaust emissions? HC (Hydrocarbons) An ignition fault could cause excessive _____ exhaust emissions Both Technicians A and B Two techs are discussing clogged EGR passages. Technician A says clogged EGR passages can cause excessive NOx exhaust emissions. Technician B says that clogged EGR passages can cause the engine to ping (spark knock or detonation). Which technician is correct? Rough idle / Stalling An EGR valve that is partially stuck open would MOST LIKELY cause what condition? Technician B only Technician A says that if a PCV rattles, than it is okay and does not need to be replaced. Technician B says that if a PCV valve does not rattle, it should be replaced. Which technician is correct? Before the throttle plate Where is the fuel injected in a TBI (Throttle Body Injection) system? Waste Spark Ignition System DIS (Distributorless Ignition System) is also known as _____________ ? high voltage What is needed and necessary to jump the gap in a spark plug? Safety Margin 5V reference voltage is used, to create an ample __________ for dips in VS (Voltage Supply). Language / Protocol OBDII is a _________________ , not a connector. Idle Control / Mixture Control Coolant Temperature data is used for ____________________ ? Two (2), VS (Voltage Supply) + Ground a Rheostat has how many terminals ? Three (3), VS (Voltage Supply) + Signal + Ground a Potentiometer has how many terminals ? Faulty If the STFT (Short Term Fuel Trim) and LTFT (Long Term Fuel Trim) will converge, it is "most likely" that the MAF (Mass Air Flow) sensor is ______________ ? CTS (Coolant Temperature Sensor) and MAP (Manifold Absolute Pressure) During 'Open Loop', PWM (Pulse Width Modulation) of the fuel injector is based upon which sensor(s) ? O2 sensor During 'Closed Loop', PWM (Pulse Width Modulation) of the fuel injector is based upon which sensor(s) ? Coolant Temperature Sensor CTS is an abbreviation for which sensor? False Air / Air Leaks The first thing to check when diagnosing a MAF (Mass Air Flow) Sensor, is _______________ ? Accelerator Pedal Position Sensor APP is an abbreviation for which sensor? Manifold Absolute Pressure MAP is an abbreviation for which sensor? Intake Air Temperature IAT is an abbreviation for which sensor? Forty (40) The check valve in a fuel pump should hold pressure for approx. how many mins ? Throttle Actuator Control TAC is an abbreviation for which sensor? a Jet or Suction Pump The pump used to transfer fuel from one half of the fuel tank to the other, to maintain equal balance between both sides is called ? Throttle Position Sensor TPS is an abbreviation for which sensor? Hot The Air-Pump injects 'air / oxygen' into the Catalytic Converter to keep the catalytic converter __________ at cruising speed. 2.5 Volts What is the maximum voltage for CAN-Low to ground Barometric Sensor BARO is an abbreviation for which sensor? Bistable Relay The ____________________________ maintains its state after being actuated, it has no default position and remains in its last position when the drive current stops flowing. Powertrain-CAN What is PT-CAN an abbreviation for ? Mass Air Flow MAF is an abbreviation for which sensor? Controller Area Network What is CAN an abbreviation for ? a Diode What does this symbol denote an LED Diode What does this symbol denote a Bulb What does this symbol denote a Transistor What does this symbol denote Linear Bus Topology If the control units are positioned one after the other on the bus, this is called... [Show More]

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