ASE 246 Final

Excessively high HC emissions may be caused by ______. a.a lean air/fuel ratio b.an improper ignition timing c.ignition system misfiring d.both A and B

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NOX emissions are caused by nitrogen and oxygen uniting at cylinder temperatures above ______. a.250°F (121°C) b.500°F (260°C) c.5,000°F (2,760°C) d.2,500°F (1,371°C)

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QUESTION 43 What tool is needed to test vacuum-type EGR valves? a.digital pyrometer b.feeler gauge c.hand vacuum pump d.All the answers are correct.

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Technician A says some BEVs use liquid to heat the passenger compartment. Technician B says some BEVs use an electric resistance heater with a fan to heat the passenger compartment. Who is correct?

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Technician A says that all FCEVs have regenerative braking. Technician B says that all FCEVs have an auxiliary 12-volt battery. Who is correct?

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Technician A says that gasoline can be used as a source of hydrogen for a fuel cell. Technician B says that carbon dioxide can be used as a source of hydrogen for a fuel cell. Who is correct?

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When the engine is running at peak efficiency, the only gas that is desirable to be at its peak level is ______. a.CO b.CO2 c.O2 d.HC?

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When working on a high-voltage system, Technician A makes sure the outside edges of the buffer zone are at least one foot away from the car. Technician B places orange cones to define the outer boundaries of the buffer zone. Who is correct?

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When you are depowering the high-voltage battery system of a hybrid vehicle, _____. a.wear lineman's gloves b.never wear anything metallic (jewelry) c.wait at least five minutes after disconnecting the HV batteries before working on the vehicle's electrical system d.All the answers are correct.

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Which of the following CANNOT be used as a source for the production of hydrogen? a.Gasoline b.Natural gas c.Carbon dioxide d.Methanol

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Which of the following gases is NOT considered to be harmful? a.NOX b.HC c.O2 d.CO

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A catalytic converter may be tested with a ______. a.pyrometer b.rubber mallet c.vacuum gauge d.All the answers are correct.

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A typical four-gas exhaust analyzer does not measure ____ emissions. a.CO2 b.CO c.HC d.NOX

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Blowby gases condense in the crankcase and react with the oil to form ______. a.sludge b.carbon black c.varnish d.hydrocarbons

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Technician A says cylinder misfiring causes a significant increase in HC emissions. Technician B says a dirty air filter may cause high CO emissions. Who is correct?

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Technician A says that power is the ability to do work. Technician B says that energy is the rate at which work is done. Who is correct?

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While discussing working on hybrid vehicles, Technician A says to make sure that the high-voltage system is shut down and isolated from the vehicle before working near or with any high-voltage component. Technician B says to always use insulated tools when working on or near the high-voltage system, even when it is depowered. Who is correct?

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A restricted catalytic converter may cause ______. a.loss of power at high speeds b.stalling after starting c.a drop in engine vacuum as engine rpm increases d.All the answers are correct.

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A scan tool can be used to diagnose a faulty ______. a.knock sensor b.EVR solenoid c.EVAP system d.All the answers are correct.

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A stuck open EGR valve could cause _____. a.stalling b.excessive NOX emissions c.engine knock (detonation) d.All the answers are correct.

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A vehicle is in the shop because it failed an emissions test due to excessive carbon monoxide (CO). The fault was a bad oxygen sensor that was easily replaced. Technician A says that the EGR system should be checked before the vehicle is retested. Technician B says the vehicle should be tested with a five-gas analyzer before it is retested. Who is correct?

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After isolating the high-voltage system, what is the minimum time you should wait before beginning to work on or around the hybrid system? a.5 minutes b.1 hour c.30 minutes d.10 minutes

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All the following are considered harmful gases EXCEPT: a.HC b.O2 c.NOX d.CO

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An I/M 240 test lasts _____ minutes. a.two b.six c.eight d.four

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Before the EVAP system on an OBD-II vehicle can be pressure tested or smoke tested for leaks, a scan tool must be used to _____. a.close the canister vent solenoid b.close the IAC valve on the throttle body c.open the canister purge solenoid d.reset the EVAP flow rate monitor

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Carbon monoxide is being discussed. Technician A says as the air/fuel ratio becomes richer, the CO levels decrease. Technician B says CO is a colorless, odorless, and highly poisonous gas that can cause death. Who is correct?

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Crankcase pressure forcing crankcase gases through the clean air hose and into the air cleaner is being discussed. Technician A says the cause may be an excessive amount of blowby. Technician B says the cause may be a restricted PCV valve. Who is correct?

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Excessively high CO emissions may be caused by a ______. a.lean air/fuel mixture b.missing air filter c.higher than normal fuel pressure d.All the answers are correct.

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Hybrid vehicles are being discussed. Technician A says in a series hybrid the engine is there only to extend the vehicle's driving range. Technician B says in a parallel hybrid the electric motor and batteries are the main power source during normal driving conditions. Who is correct?

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In an engine in good condition running at 2,000 rpm, with a working EGR system, NOX should be below _____ ppm. a.1,000 b.200 c.1,750 d.100

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OBD-II canister purge systems are being discussed. Technician A says the canister purge solenoid valve is only open and controlled when the system is in open loop. Technician B says because the system responds to current engine and operating conditions, the purging of the vapors does not affect drivability. Who is correct?

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Technician A checks a PCV valve by sucking air through it with his mouth. Technician B checks a PCV valve by removing the valve from the grommet in the valve cover and placing his finger over the end of the valve to check for vacuum. Who is correct?

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Technician A says CO emissions increase as the air/fuel ratio becomes richer. Technician B says CO emissions increase as the air/fuel ratio becomes leaner. Who is correct?

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Technician A says Ford hybrid SUV's with 4WD have an additional motor in the rear axle. Technician B says Ford's Energi models are plug-in hybrids. Who is correct?

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Technician A says HC emissions are caused by incomplete combustion. Technician B says an excessively lean air/fuel mixture may result in cylinder misfiring and high HC emissions. Who is correct?

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Technician A says PVE refrigerant oil is commonly recommended for electric A/C compressors. Technician B says PAG refrigerant oil can be used in many electric A/C compressors. Who is correct?

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Technician A says a defective PCV valve may cause rough idle operation. Technician B says the PCV system depends upon a properly sealed engine to perform correctly. Who is correct?

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Technician A says a defective throttle position (TP) sensor will not affect the EGR valve operation. Technician B says a defective engine coolant temperature (ECT) sensor will not affect the EGR valve operation. Who is correct?

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Technician A says a loose oil filler cap or a dip stick that is not fully seated in the dipstick tube can change the LTFT on a MAF system. Technician B says the PCV system will draw unfiltered air through these leaks which could result in premature wear of engine parts. Who is correct?

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Technician A says a mild hybrid has stop-start, regenerative braking, and electric motor assist available when the engine needs added power to overcome the load. Technician B says a full hybrid has stop-start, regenerative braking, electric motor assist, and can be driven by only electricity. Who is correct?

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Technician A says a motor converts electrical energy into mechanical energy. Technician B says an engine converts chemical energy into mechanical energy. Who is correct?

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Technician A says a pressure gauge can be inserted into the oxygen sensor bore, and back pressure caused by the catalytic converter can be measured. Technician B says a vacuum gauge can be used to identify a restricted converter. Who is correct?

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Technician A says high engine temperatures reduce HC and CO emissions. Technician B says incorrect ignition timing can increase the production of NOX.Who is correct?

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Technician A says hybrid vehicles have an electric water pump to circulate coolant through the heater core when the engine is stopped. Technician B says some hybrid vehicles have a hot coolant storage tank to provide heat for the passenger compartment when the engine is shut down. Who is correct?

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Technician A says if the EGR valve does not open, the engine may emit excessive amounts of HC. Technician B says if the EGR valve does not open, the engine may detonate on acceleration. Who is correct?

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Technician A says if the EVAP system is purging vapors from the charcoal canister while the engine is idling, rough engine operation will occur. Technician B says the system should not have more than 0.5 liter of flow during the 240 seconds of an I/M 240 test. Who is correct?

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Technician A says most hybrids also have an auxiliary 12-volt battery to power conventional electrical items, such as lighting, wipers, sound systems, etc. Technician B says the DC-DC converter reduces some of the high voltage DC from the battery pack to 12-volt DC in order to charge the auxiliary 12-volt battery. Who is correct?

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Technician A says retrieving DTCs from the control system is the best beginning for diagnosing emission problems. Technician B says because a single emissions system component failure can set multiple DTCs, codes should be used only to confirm the effectiveness of the repairs. Who is correct?

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Technician A says the DPFE (differential pressure feedback EGR) sensor determines the amount of gas flowing through the EGR valve by measuring the pressure drop across an orifice. Technician B says some EGR valves have an NTC thermistor that measures exhaust gas temperature at the outlet of the EGR valve. Who is correct?

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Technician A says the EVAP monitor for an OBD-II system determines whether there is sufficient purge flow by varying the purge solenoid duty cycle while monitoring change in STFT. Technician B says the canister vent solenoid must be open during the EVAP pressure test portion of the monitor. Who is correct?

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Technician A says the OBD-II EVAP system leak test monitor will not run if the fuel level is too high. Technician B says the monitor will not run if the fuel level is too low. Who is correct?

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Technician A says the back pressure transducer may be incorporated into the design of the EGR valve. Technician B says negative back pressure transducers use the vacuum in the exhaust between pressure pulses to modulate the EGR flow. Who is correct?

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Technician A says with conductive charging there is no metal-to-metal contact between the charge paddle and the charge port of the vehicle. Technician B says inductive charging takes place by making a connection between the charging connector and the charge port. Who is correct?

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The AIR system reduces ______. a.hydrocarbons b.carbon monoxide c.both A and B d.neither A nor B

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The OBD-II EGR system monitor tests the functioning of the EGR system by opening the EGR valve while monitoring the change in ______. a.STFT b.EGR outlet temperature c.MAP voltage d.All the answers are correct.

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The customer complains of a loss of power at highway speeds and a rough running engine at all speeds. A five-gas analyzer reveals these measurements at 2,500 rpm: HC = 700 ppm, CO = 0.2%, CO2 = 9.2%, O2 = 6.2%, and NOX = 330 ppm. What is the most likely cause? a.ignition misfire b.rich mixture c.lean misfire d.lean mixture

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The enhanced evaporative emission system (OBD-II) can detect a leak in the hoses, lines, fuel tank, or gas cap as small as _____ in. a. .010 b. .020 c. .040 d. .080

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The exhaust gas recirculation system reduces ______. a.hydrocarbons b.carbon monoxide c.oxides of nitrogen d.All the answers are correct.

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The first controlled automotive emission was ______. a.evaporative emissions b.tailpipe emissions (HC and CO) c.NOX d.crankcase vapors

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The normal operating temperature for most catalytic converters is about ______. a.900°F (500°C) b.450°F (235°C) c.1,400°F (750°C) d.1,200°F (650°C)

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To monitor the vapor purge in most systems, the PCM changes the duty cycle of the purge solenoid while monitoring the ______. a.LTFT b.MAF voltage c.STFT d.MAP voltage

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Under what conditions is the EGR valve open? a.idle (warm engine) b.cruise (warm engine) c.starting d.Wide open throttle

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What gas has a rotten egg smell and is caused by sulfur in gasoline chemically reacting with air inside the catalytic converter? a.sulfur dioxide (SO2 ) b.hydrogen sulfide (HS) c.sulphuric acid (H2SO4) d.All the answers are correct.

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What is the basic fuel for a fuel cell? a.Electricity b.Methanol c.Hydrogen d.Gasoline

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What tool is needed to test a digital EGR valve? a.scan tool b.a 0.020 inch pin gauge c.jumper wires d.All the answers are correct.

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Which of the following is NOT an advantage of a hybrid vehicle? a.improved acceleration performance b.zero CO2 emissions c.increased fuel economy d.90 percent fewer emissions

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Which of the following systems is designed to reduce NOX? a.PCV b.AIR c.EGR d.EVAP

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Which of the statements about hydrogen is false? a.Hydrogen is produced in a fuel cell by breaking down water. b.Hydrogen contains more energy per weight than any other fuel. c.Fossil fuels are a combination of carbon and hydrogen. d.A hydrogen atom is one proton and two electrons.

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While discussing an illuminated Malfunction Indicator Light (MIL) on the instrument panel of a BEV: Technician A says diagnosis of BEV concerns are much more difficult than diagnosing concerns on a conventional vehicle because there are more components.. Technician B says faults held in the computer's memory can be retrieved as DTCs. Who is correct?

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While discussing charger connections: Technician A says nearly all BEVs currently sold in North America have an AVCON connector. Technician B says the connector currently used for DC fast charging on the Nissan Leaf and Mitsubishi i vehicles is based on the CHAdeMO standard. Who is correct?

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While discussing regenerative braking, Technician A says the regenerative system can completely stop the vehicle in order to generate a maximum amount of electricity. Technician B says that because most hybrids are FWD vehicles, the rear wheels are designed to claim the most kinetic energy. Who is correct?

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While discussing the DC-DC converter used in most hybrids: Technician A says that it changes some of the DC voltage from the battery module to an AC voltage for the electric motors. Technician B says that it provides the power to operate the car's 12 -volt electrical system and accessories. Who is correct?

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Which of the following is the least likely to decrease fuel consumption of a hybrid vehicle? a.Increased aerodynamic drag b.Stop-start systems c.Lighter and less powerful engines d.Low-rolling resistance tires

a.Increased aerodynamic drag

The high voltage wiring in a hybrid vehicle is identified by the _____ colored wiring harness cover. a.violet b.red c.orange d.pink

c.orange