Skip to main content

Bartleby Sitemap - Textbook Solutions

All Textbook Solutions for Automotive Technology: A Systems Approach (MindTap Course List)

Which of the following are considered soft, cut gaskets? Paper gaskets Cork gaskets Cork/rubber gaskets All of the above What material is typically not used to form a rear main bearing oil seal? Polyacrylate RTV Silicone synthetic rubber Viton Which of the following statements about preparing to assemble an engine is not true? Discard and replace all bolts that are damaged. Identify what bolts go into the specific bores. Use a thread locker on all bolts. Clean bolt and cylinder block threads with a thread chaser or tap.On hybrid vehicles, how can you identify the high voltage cables and connectors?True or False? Some crankshaft and camshaft timing sensors have a specified gap that must be set during installation.1ASRQ Technician A uses adhesives to hold gaskets in place while installing them. Technician B uses RTV sealant on all surfaces that are prone to leaks. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A uses soft gaskets on valve covers. Technician B uses soft gaskets on water pumps. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A inspects all sealing surfaces for damage and uses a supplementary sealant on the gaskets if the surface is questionable. Technician B coats the intake gasket on some engines with a nonhardening sealer. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that oil pan gaskets are often made of cork due to its ability to conform to small imperfections in the oil pan. Technician B says oil pan and valve cover gaskets are often MLS gaskets to account for the different expansion rates between components. Who is correct? Technician A Technician B Both A and B Neither A nor B 6ASRQ While discussing proper engine break-in: Technician A says that the engine should run at idle speed for at least 2 hours. Technician B says that the engine should be accelerated from a stop at full throttle to 50 mph and that this cycle should be repeated at least ten times. Who is correct? Technician A Technician B Both A and B Neither A nor B 8ASRQ 9ASRQ While selecting the proper RTV for a particular application: Technician A uses RTV in a black tube for all high-temperature applications. Technician B uses RTV in a red tube for most general applications. Who is correct? Technician A Technician B Both A and B Neither A nor B What is the most efficient way to increase a radiators efficiency?True or False? Oil pressure is determined by whether the pump is a gear type or rotor type and by oil clearances, the pumps pressure regulator valve, and oil viscosity.Describe the simple test used to determine whether the water pump is providing good circulation.Which of the following is a function of the engines lubrication system? Holds an adequate supply of oil Removes contaminants from the oil Delivers oil to all necessary areas of the engine All of the above What is ECD and what can result from it?True or False? To eliminate the drain of engine power during times when cooling fan operation is not needed, many of todays belt-driven fans have a fan clutch that prevents the operation of the fan when the engine and radiator are heated up.For every pound of pressure put on engine coolant, the boiling point of the coolant is raised about. 2°F(1.1°C) 3°F(1.6°C) 4°F (2.2°C) 5°F(2.7°C)Which is not a typical method of driving the water pump? Accessory drive belt Electric motor Hydraulic motor Timing belt Which of the following is not an effective way to determine if an engine has an internal coolant leak? Performing a pressure test on the system Visually inspecting the exhaust, coolant, and engine oil Using a dye penetrant and black light Using a combustion leak tester Explain why a pressure relief valve is needed in an automotive oil pump.List five problems that can be caused by engine overheating.Cooling system hoses should be replaced when they are. hard (brittle) soft (spongy) swollen all of the above True or False? The presence of air in the cooling system indicates the head gasket is faulty.Which of the following is not a true statement about thermostats? Faulty thermostats are often the cause of air pockets in the coolant passages. They can also cause an increase in fuel consumption and poor engine performance. If the thermostat is stuck open, the coolant may not reach the desired temperature because it is cooled before it gets hot If a thermostat is stuck closed, coolant will not flow between the engine and radiator and the engine will quickly overheat Describe the procedure for using air bleed valves to purge air out of a cooling system.Technician A uses a feeler gauge and straightedge to determine the pump cover flatness. Technician B uses an outside micrometer to measure the diameter and thickness of the outer rotor. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that excessive engine oil consumption can be caused by low oil levels. Technician B says that excessive oil consumption can be caused by worn valve guides. Who is correct? Technician A Technician B Both A and B Neither A nor B While checking for conditions that might cause coolant electrolysis: Technician A places the positive lead of a voltmeter into the coolant and connects the negative lead to a ground. Technician B checks for the presence of voltage in the coolant with the ignition off. Who is correct? Technician A Technician B Both A and B Neither A nor B When installing an oil pump in an engine Technician A packs the pump with petroleum jdly. Technician B submerges the pump in clean oil and rotates the pump shaft to fill the pump body. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that if the PCV valve or connecting hoses become clogged, excessive pressure will develop in the crankcase and can cause oil leaks. Technician B says that if the PCV valve or connecting hoses become clogged, oil may be pushed into the air cleaner or cause it to be drawn into the intake manifold. Who is correct? Technician A Technician B Both A and B Neither A nor B While bleeding air from a cooling system: Technician A loosens a heater hose at its highest point Technician B uses air bleed valves. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing an engine that overheats after frequent hard accelerations: Technician A checks for a collapsed lower radiator hose. Technician B checks the cooling fan electrical circuit. Who is correct? Technician A Technician B Both A and B Neither A nor B While performing a cooling system service on a hybrid vehicle; Technician A says it may be necessary to disconnect the electric water pump. Technician B says it may be necessary to disable the high-voltage system before servicing the engine. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor B While discussing the causes of extreme engine bearing damage Technician A says that contaminated and old engine oil could be the cause. Technician B says that a leaking radiator could be the cause. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing the cause of air bubbles in the coolant recovery tank: Technician A checks for a bad head gasket. Technician B checks the radiator cap. Who is correct? Technician A Technician B Both A and B Neither A nor B What is represented by the E, I, and R in the formula E = IR?2RQ What are the two types of wires and which is the most commonly used in automobiles?Define voltage drop.Define circuit protection.What is a normally dosed switch?7RQ What is the difference between voltage and current?What is an SPST switch?Which type of resistor is commonly used in automotive circuits? Fixed value Stepped Variable All of the above 11RQ Solve the parallel circuit for total circuit resistance, total circuit amperage, and the amperage through each leg (Figure 15-62).13RQ 14RQ 15RQ 1ASRQ 2ASRQ WHiile discussing the circuit shown in Figure 15-63: Technician A says that the total resistance of the circuit is 1 ohm. Technician B says that the current flow through the 6-ohm resistor is 12 amps. Who is correct? Figure 15-63 Technician A Technician B Both A and B Neither A nor B While discussing electrical grounds: Technician A says that a component may be grounded through its mounting to a major metal part. Technician B says that some components must be grounded by connecting its positive terminal to a metal section of the frame. Who is correct? Technician A Technician B Both A and B Neither A nor B 5ASRQ 6ASRQ While discussing copper wire: Technician A says that if the length of wire is doubled, the resistance between the wire ends is doubled. Technician B says that if the diameter of a wire is doubled, the resistance between the wire ends is doubled. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing current flow: Technician A says that current results from electrons being attracted to protons. Technician B says that for practical purposes, it is best to remember that current flows from a point of higher potential to a point of lower potential. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing voltage Technician A says that voltage is the force developed by the attraction of the electrons to protons. Technician B says that the force developed by the attraction of electrons to protons is called electromotive force and it is measured in volts. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the AWG system: Technician A says that most automotive wiring range from 0 to 4 gauge. Technician B says that the higher the gauge number, the larger the diameter of the wire. Who is correct? Technician A Technician B Both A and B Neither A nor B How will an electrical circuit behave if there is a short in the circuit?What happens to an electrical circuit when there is unwanted resistance in it?3RQ 4RQ Wiring harnesses are typically shielded by plastic conduit. What color is normally used to shield SRS- related wiring? Black Green c. Yellow d. Orange True or False? The MIN/MAX function on some DMMs can be used to check for electrical noise.True or False? A zero reading on an ohmmeter means the circuit or component is open.8RQ What type of solder should be used to repair electrical wiring?Which of the following lab scope controls must be set when trying to observe how long an event takes place? Intensity Vertical Horizontal Trigger 11RQ 12RQ 13RQ Which of the following information is not given in a wiring diagram? Wire-by-wire color coding Location of wire harness travel Terminal designation Component designations While troubleshooting a problem, the key to identifying the exact cause of the problem is testing all of the vehicles components and circuits until the problem is found.While discussing electricity: Technician A says that an open causes unwanted voltage drops. Technician B says that high-resistance problems cause increased current flow. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing NTC thermistors: Technician A says that some systems use this type of thermistor as a protection device. Technician B says that when there is high current in a circuit, the resistance of the thermistor increases and causes a decrease in current flow. Who is correct? Technician A Technician B Both A and B Neither A nor B While measuring the resistance of a wire with an ohmmeter: Technician A says that if low resistance is shown on the meter, the wire is shorted. Technician B says that if no resistance is measured, the wire is shorted. Who is correct? Technician A Technician B Both A and B d. Neither A nor B While testing variable resistors: Technician A says that while checking a rheostat with a voltmeter, the voltage should change smoothly with a change in the control. Technician B says that a potentiometer can be checked with a scope. Who is correct? Technician A Technician B Both A and B Neither A nor B 5ASRQ Technician A uses a testlight to test circuit protection devices. Technician B uses a voltmeter to test circuit protection devices. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A uses a testlight to detect resistance. Technician B uses a jumper wire to test circuit breakers, relays, and lights. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing the location of a wire-to-wire short: Technician A checks the wiring of the affected circuits for signs of burned insulation and melted conductors. Technician B checks common connectors shared by the two affected circuits. Who is correct? Technician A Technician B Both A and B Neither A nor B While measuring resistance: Technician A uses an ohmmeter to measure resistance of a component before disconnecting it from the circuit. Technician B uses a voltmeter to measure voltage drop. A circuit with very low resistance will drop zero or very little voltage. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing how to test a switch: Technician A says that the action of the switch can be monitored by a voltmeter. Technician B says that continuity across the switch can be checked by measuring the resistance across the switch is in its different positions. Who is correct? Technician A Technician B Both A and B Neither A nor B Define an electrolyte and its role in battery operation.2RQ How is a battery leakage test conducted?Describe parasitic draw.How can you identify the high-voltage system in most hybrid vehicles?How many volts are present in a fully charged 12-volt battery?What is meant by the term specific gravity?What causes gassing in a battery?List five things that shorten the life of a battery.True or False? All electrochemical batteries have three major parts: two electrodes or plates, and an electrolyte.11RQ True or False? A batteny is an electromechanical device.True or False? The BCI determines battery ratings for CCA, CA, and reserve capacity.Which of the following statements about battery types is not true? Deep cycle batteries are designed to go through many charge and discharge cycles. A low-maintenance battery is a heavy-duty version of a normal lead-acid battery. Maintenance-free batteries require external holes or vent caps. In a gel cell battery, gassing is minimized and vents are not needed.Which of the following statements about battery ratings is true? The ampere-hour rating is defined as the amount of steady current that a fully charged battery' can supply for 1 hour at 80°F (26.7°C) without the cell voltage falling below a predetermined voltage. The cold cranking amps rating represents the number of amps that a fully charged battery can deliver at 0°F (— 17.7°C) for 30 seconds while maintaining a voltage above 9.6 volts for a 12 volt battery. The cranking amp rating expresses the number of amperes a battery' can deliver at 32°F (0°C) for 30 seconds and maintain at least 1.2 volts per cell. The reserve capacity rating expresses the number of amperes a folly charged battery at 80°F can supply before the batterys voltage falls below 10.5 volts.1ASRQ Technician A says that the reserve rating of a battery is the amount of steady current that a fully charged battery can supply tor 20 hours without the voltage falling below 10.5 volts. Technician B says that ampere-hour ratings state how many hours the battery is capable of supplying 25 amperes. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that battery straps should be used whenever a battery is lifted Technician B says that when a battery is removed, the positive cable should be disconnected first. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says jump-starting a battery can damage electronic components. Technician B says a dead battery should be jump-started instead of recharged. Who is correct? Technician A Technician B Both A and B Neither A nor B 5ASRQ Technician A says that before a battery is removed, a memory' saver ought to be installed. Technician B says that before a battery is removed, the positive cable should be disconnected and the area around the battery should be cleaned. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that side post terminals need to be removed to inspect them for corrosion. Technician B says that side post terminals can be damaged by over- tightening the terminal bolL Who is correct? Technician A Technician B Both A and B Neither A nor B A vehicles battery goes dead after sitting for two days. Technician A says a thorough battey inspection should be performed. Technician B says a check for a parasitic draw should be performed. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A always wears safety glasses or goggles when working with batteries. Technician B says that there is no need to seek medical help if electrolyte gets in your eyes as long as you flush your eyes immediately after the electrolyte hits them. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the results of a load test: Technician A says that if a battery fails a load test but the voltage rises above 12.4 volts when the load is removed, the battery should be replaced. Technician B says that if a battery fails a load test but the voltage rises above 12.4 volts when the load is removed, the battery is able to hold a charge. Who is correct? Technician A Technician B Both A and B Neither A nor B True or False? The strength of the magnetic field in an electromagnet increases with an increase in the number of turns of wire and the current flowing through them.2RQ 3RQ True or False? Many armature bearings are held in the case by a retainer, whereas bushings are typically pressed out and into their bore.Which of the following is not part of the starter motor circuit? Battery Starting safety switch Starter motor Relay solenoid Which of the following tests would not be performed to check for high resistance in the battery' cables? Cranking voltage test Insulated circuit resistance test Starter relay by-pass test Ground circuit resistance test When the starter spins but does not crank the engine, which of the following may be true? Defective starter relay Damaged flywheel teeth A faulty starter solenoid All of the above If the solenoid clicks while trying to crank the engine with the starter, which of the following is not a probable cause? A faulty neutral safety switch Low battery voltage Low voltage available to the solenoid An open in the hold-in winding 9RQ 10RQ 11RQ The device that prevents the engine from turning the armature of the starter motor is the. overrunning clutch pinion gear flywheel pole shoe The part of the armature that the brushes ride on is called the Describe how to perform a starter bench test.A control circuit voltage drop test shows a 1.1 volt drop at the starter S terminal. Which of the following could be the cause? High resistance in the solenoid switch circuit High resistance in the clutch safety switch Loose battery cable connection Short in the starter armature windings An engine cranks slowly: Technician A says that a possible cause of the problem is poor starter circuit connections. Technician B says that an engine problem could be the cause. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing armature testing: Technician A says to test for shorts, place the ohmmeter leads on a commutator segment and armature shaft. Technician B says that continuity should exist between the commutator and the armature shaft. Who is correct? Technician A Technician B Both A and B Neither A nor B Pinion gear-to-flywheel ring gear clearance is being discussed: Technician A says that if there is too much clearance, there will be a high pitch while the engine cranks. Technician B says that if there is too little clearance, there will be a high pitch noise after the engine is started. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that a starter no-load test is conducted with the starter in a bench vise. Technician B says that the no-load test is used to determine starter motor circuit voltage drop. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A checks a starters field coils for opens by connecting an ohmmeter between the coils' power feed wire and the field coil brush lead. Technician B checks a starters field coil for a short to ground by connecting an ohmmeter across the field coil brush lead and the starter housing. Who is correct? Technician A Technician B Both A and B Neither A nor B 6ASRQ When diagnosing a no-crank no-start condition, no voltage is present at the S terminal of the solenoid while attempting to crank the engine. Technician A says a faulty starter motor is the cause. Technician B says a shorted safety switch is the cause. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing a no-crank condition: Technician A says to verify the condition of the batten' before testing the starter motor Technician B says a scan tool may be used to check starter control circuit operation. Who is correct? Technician A Technician B Both A and B Neither A nor B 9ASRQ While discussing electric motors: Technician A says that when there is high CEMF, there will be high current flow. Technician B says that if the reluctance of an electromagnet increases, its field strength increases. Who is correct? Technician A Technician B Both A and B Neither A nor B True or False? A faulty voltage regulator can only cause a no-charge condition.To protect electronic circuits, some voltage regulators have a circuit built into them.What is the purpose of the diodes in the generator?How does a voltage regulator regulate the voltage output of an AC generator?Describe the differences between an overrunning alternator pulley and an alternator decoupler pulley.What would happen to the output of an AC generator if one of the stator windings has an open?Describe the basic difference between a DC motor and a DC generator.8RQ True or False? A generator that is not producing voltage or current may have an open stator winding.What part of the AC generator is the rotating magnetic field? Stator Rotor Brushes Poles Which type of stator winding has two windings in parallel? Wye Delta Trio Series Slip rings and brushes. mount on the rotor shaft conduct current to the rotor field coils are insulated from each other and the rotor shaft all of the above The alternating current produced by the AC generator is rectified into DC, or direct current, through the use of. transistors electromagnetic relays diodes capacitors 14RQ 15RQ Technician A says that the waveform produced by an AC generator after rectification is called a sine wave. Technician B says that the waveform produced by the AC generator after the output moves through the diodes is a straight line because it is a constant DC voltage. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing what is indicated by a vehicles charge indicator: Technician A says that any positive reading on an ammeter shows that the battery is in good condition. Technician B says that if the voltmeter reading does not increase immediately after starting the engine, the battery is bad. Who is correct? Technician A Technician B Both A and B Neither A nor B When checking the charging system on a late-model vehicle: Technician A connects a scan tool to monitor the systems voltage output. Technician B connects a scan tool to retrieve any DTCs that may be in the system. Who is correct? Technician A Technician B Both A and B Neither A nor B 4ASRQ Technician A says generator output should be within 10 amps of the AC generators rated output. Technician B says generator voltage output should not exceed 14.5 volts during voltage output test. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that many newer charging systems do not have a separate voltage regulator. Technician B says that most late-model charging systems are computer regulated through the ground of the field. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing rapid and severe belt wear after generator replacement; Technician A says that a defective drive belt tensioner may be the cause. Technician B says that the generator may have the wrong type of pulley installed. Who is correct? Technician A Technician B Both A and B Neither A nor B 8ASRQ 9ASRQ 10ASRQ What lighting systems are controlled by the headlight switch?What is a CHMSL?True or False? HID lamps produce more heat and white light than a halogen bulb.True or False? The headlights on many adaptive head light systems can swivel up to 5 degrees in the direction the vehicle is turning.True or False? All turn signal flasher units contain a temperature-sensitive bimetallic strip and a heating element.Which of the following may cause the turn signal blink rate to be incorrect? Burned out bulb Open in turn signal circuit Incorrect flasher unit installed All of the above What are the most probable causes for one low-beam headlamp not working?How many wires are normally connected to a double filament light bulb?Circuits that can energize the high beams even if the headlight switch is off are known as circuits. flash-to-pass mercury dimmer retractable Why do some manufacturers protect the headlamp circuit with a circuit breaker instead of a fuse?What types of headlights do not have a filament?What is the primary tool used to diagnose an auto leveling headlamp system?Which of the following would probably not cause the headlights on both sides of the vehicle not to work? An open in the power or ground circuit A bad (control) switch A blown fuse Low generator output The stoplight switch is normally mounted on the instrument panel transmission brake pedal arm none of the above Which of the following is not a true statement about LED-based lights? LEDs achieve their full output in about 200 milliseconds. LEDs require a much smaller space so they are much less intrusive in the trunk. LEDs have a long operating life. LEDs provide a more precise contrast and signal pattern, thus attracting attention much more effectively.While troubleshooting a headlight problem: Technician A says that when one headlamp does not work, the problem may be a burned-out bulb or lamp. Technician B says that you should check for voltage at the bulb before replacing a bulb. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that the condition of the vehicles springs and shocks should be checked before aligning a headlight. Technician B says that the vehicle should have a full tank of fuel when its headlights are being adjusted. Who is correct? Technician A Technician B Both A and B Neither A nor B Composite headlights are being discussed: Technician A says that they have replaceable bulbs. Technician B says that a cracked or broken lens will prevent the operation of a composite headlamp. Who is correct? Technician A Technician B Both A and B Neither A nor B While troubleshooting a brake light problem; Technician A says that when the pedal is depressed the brake lights should come on. Technician B says that on some systems only part of the brake light should illuminate when there is slight pressure on the brake pedal. Who is correct? a. Technician A Technician B Both A and B Neither A nor B Technician A says that a sealed-beam headlight that is cracked should be replaced. Technician B says that cracking or breaking of the composite housing or lens does not prevent a halogen bulb from working. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing an HID lamp that does not turn on: Technician A says a smoky or blackened lamp may indicate the bulb is burned out. Technician B says before replacing a suspected bad ballast, check to make sure it is getting power and ground. Who is correct? Technician A Technician B Both A and B d. Neither A nor B Technician A says that flickering vehicle lights can be caused by a circuit breaker that is kicking in and out due to a short. Technician B says that flickering vehicle lights can be caused by a loose electrical connection. Who is correct? Technician A Technician B Both A and B Neither A nor B The turn signals operate in the left direction only; Technician A says that the flasher unit is bad. Technician B says that the fuse is probably blown. Who is correct? Technician A Technician B Both A and B Neither A nor B The right back-up lamp is dim: Technician A says that the back-up lamp switch may have high resistance. Technician B says that the back-up lamp fuse may have corroded terminals. Who is correct? Technician A Technician B Both A and B Neither A nor B When the headlights are switched from low beam to high beam, all headlights go out: Technician A says that the problem may be a bad dimmer switch. Technician B says that the ignition switch may be bad. Who is correct? Technician A Technician B Both A and B Neither A nor B True or False? A driver information center projects indicator and warning lights on the windshield rather than illuminating them in the instrument panel.What is the purpose of an IVR?Explain how an air-core gauge works.What are two ways to provide input for the speedometer?Describe the two types of instrument panel displays.What is the device found in some fuel tanks to prevent fuel gauge fluctuations due to rough road surfaces?What is the correct way to check a coolant temperature sensor?What type of sending unit is typically used to monitor oil pressure?What is the major difference between an indicator lamp and a warning light?True or False? The ABS lamp turns on whenever the system is actively regulating drive torque and braking force.The indicator needle on a speedometer is held to the zero position by. magnetic force the weight of the needle the speedometer cable a hairspring Which of the following uses a permanent magnet and two electromagnets? Air-core gauge Balancing coil gauge Quartz analog gauge D' Arsonval gauge What type of memory is used to store the accumulated mileage in an electronic odometer? RAMc PROM ROMd. None of the above Which of the following is not a true statement about lamp-out warning lights? The lamp-out warning module measures small changes in voltage levels. An electronic switch in the module completes a ground path for the indicator lights in the event of a bulb going out. A special resistance wire is used in multibulb systems. When a bulb burns out. the module senses the increased voltage drop and turns on the indicator lamp.Which of the following statements about oil gauge circuits is not true? A switch can be used A thermistor can be used. A piezoresistive sensor can be used d An oil pressure gauge may not show actual oil pressure.While discussing what the maintenance reminders base die time for the next service on: Technician A says that future service is based on the type of driving the vehicle has seen since the last service. Technician B says that the next interval is based only on the number of miles or kilometers since the last service. Who is correct? Technician A Technician B Both A and B Neither A nor B None of the engines gauges works: Technician A tests gauge operation using a scan tool. Technician B begins by checking the fuse and then checks for voltage at the last point common to all the malfunctioning gauges. Who is correct? Technician A Technician B Both A and B Neither A nor B The oil pressure light stays on whenever the engine is running, and the oil pressure has been checked and it meets specifications: Technician A says that a ground in the circuit between the indicator light and the pressure switch could be the cause. Technician B says that an open in the pressure switch could be the cause. Who is correct? Technician A Technician B Both A and B Neither A nor B A digital speedometer constantly reads 0 mph: Technician A says that the problem may be the vehicle speed sensor. Technician B says that the problem may be the throttle position sensor. Who is correct? Technician A Technician B Both A and B Neither A nor B All gauges operate but read lower than normal: Technician A says that the connection to the instrument cluster may be corroded. Technician B says that the cluster s IVR may be open. Who is correct? Technician A Technician B Both A and B Neither A nor B When testing an engine temperature sensor: Technician A uses an ohmmeter to test the thermistor. Technician B says that the thermistor reacts to pressure and applies air pressure to the backside of the sensor. Who is correct? Technician A Technician B Both A and B Neither A nor B The coolant temperature gauge stays low (cold) after die engine has been started and ran until the engine is hot Technician A says that the wires to the sending unit may be shorted together. Technician B says that the sending unit may be electrically open. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the instrumentation on a Toyota hybrid: Technician A says that the ready light must be on before the vehicle is able to move. Technician B says that the engine must be running before the ready" light is turned on. Who is correct? Technician A Technician B Both A and B Neither A nor B The TPM warning lamp is lit: Technician A says that the cause could be low inflation. Technician B says that the customer may have used a tire sealant to seal a puncture. Who is correct? a Technician A Technician B Both A and B Neither A nor B The yellow electronic throttle control warning lamp comes on occasionally while the vehicle is driven; Technician A says that this means there is a problem with the system. Technician B says that the system is actively regulating drive torque and engine power when the lamp is lit Who is correct? Technician A Technician B Both A and B Neither A nor B Explain the three types of memory used in the computer system.Signals resemble a square pattern.Signals can have varying voltage levels.Means that data concerning the effects of the computers commands are fed back to the computer as an input signal.The type of memory' that contains specific information about the vehicle and can be replaced or repro grammed is called A is the simplest type of semiconductor.7RQ 8RQ How should vou test a diode with a multimeter?What is the major difference between ROM and RAM memory in a microprocessor?Which of the following is not a type of information stored in ROM? Strategy Look-up tables Sensor input None of the above True or False? In a high-speed CAN system, a serial data bus is used to allow communication between the various control modules in a vehicle.Which of the following is not made of semiconductor material? Zener diode Thermistor PM generator Hall-effect switch Which of the following is a basic function of a computer? To store information To process information To send out commands All of the above What is the name of the module that allows the different serial buses in a multiplexed system to communi cate with each other?1ASRQ While checking an A/C compressor clutch coil spikesuppressing diode with an ohmmeter, the meter shows infinite resistance when the diode is measured in both directions: Technician A says that the diode is open. Technician B says that all diodes should behave this way until a specified voltage is applied to them. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that some types of voltage sensors provide input to the computer by modifying or controlling a constant, predetermined voltage signal. Technician B says that a coolant temperature sensor is a voltage-generating sensor. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that multiplexing is a way to add wires without increasing the weight of the vehicle. Technician B says that multiplexing uses bus data links. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that when a diode is placed in a circuit with the positive side of the circuit connected to the positive side of the diode and the negative side of the circuit connected to the negative side if the diode, the diode is said to have reverse bias. Technician B says that the diodes P material is repelled by the positive charge of the circuit and is pushed toward the N material and that the N material is pushed toward the P. Who is correct? Technician A Both A and B Technician B Neither A nor B 6ASRQ While discussing multiplex system protocols: Technician A says that CAN communications are based on variable pulse widths carried on a single bus wire. Technician B says that Class B communications offer real-time communications over a twisted pair of wires. Who is correct? Technician A Technician B Both A and B Neither A nor B 8ASRQ While diagnosing an electronic control system: Technician A turns the ignition off before disconnecting a connector or component. Technician B uses a jumper wire to bypass a potentially faulty sensor and then observes the scan tool. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that based on current conditions, a reference voltage sensor modifies a fixed voltage from the computer and sends that voltage back to the computer. Technician B says that most reference voltage sensors are variable resistors or potentiometers. Who is correct? Technician A Technician B Both A and B Neither A nor B 1RQ Describe telematics.What should be checked if none of the grids in a rear window detogger work?True or False? Rain-sensitive wiper systems respond to the weight of the water on the windshield to regulate the speed of the wipers.What component in a wiper system makes it possible for the wipers to shut off and rest in a certain location? How does it work?Name the two most common problems that occur with power seats.7RQ 8RQ What could be the problem when the vehicles dome light dims when a power seat is moved?Rear defrosters generally have a relay with a timer. This allows. the defogger to shut down after a predetermined length of time the defogger to function just until the rear window is clear the defogger to be independent of the ignition switch none of the above 11RQ 12RQ Which of the following parts or circuits could cause one power window to not operate from either the master or the door switch? Power window fuse Power window motor Faulty wiring All of the above When diagnosing a vacuum/mechanical cruise control system that cannot maintain a constant speed, all of the following should be checked, except. the brake switch the vacuum lines the vacuum servo the vehicle speed sensor 15RQ 1ASRQ 2ASRQ 3ASRQ The reasons for slower than normal wiper operation are being discussed: Technician A says that the problem may be in the mechanical linkage. Technician B says that there may be excessive resistance in the electrical circuit. Who is correct? Technician A Technician B Both A and B Neither A nor B 5ASRQ Technician A says that some antitheft systems sound an alarm if someone enters the vehicle without a key Technician B says that some antitheft devices prevent the engine from starting. Who is correct? Technician A Technician B Both A and B Neither A nor B The circuit breaker at a power seat motor continuously trips: Technician A says that this could be caused by a seat track problem that is causing mechanical resistance. Technician B says that this could be caused by corrosion at the motor, which is causing electrical resistance. Who is correct? Technician A Technician B Both A and B Neither A nor B 8ASRQ 9. Technician A says that navigational systems rely on global positioning satellites. Technician B says that navigational systems rely on information programmed in its memory and information stored on a CD or DVD. Who is correct? Technician A Technician B Both A and B Neither A nor B While diagnosing a cruise control system that does not turn on: Technician A checks the vehicle speed sensor and its input to the control module. Technician B checks the operation of the brake lights. Who is correct? Technician A Technician B Both A and B Neither A nor B Describe the difference between an open- and a closed-loop operation.Explain the use and importance of system strategy and look-up tables in the computerized control system.Describe an OBD II warm-up cycle.Explain the trip and drive cycle in an OBD II system.Describe how engine misfire is detected in an OBD II system.Describe the purpose of having both upstream and downstream oxygen sensors in an exhaust system.Briefly describe the monitors in an OBD II system.Type B engine misfires are excessive if the misfiring exceeds to percent in a rpm period.The monitor system checks the action of the can ister purge system.The monitor system has a(n) and test to check the efficiency of the air injection system.The fuel monitor checks fuel trim and fuel trim.Which sensor is used for misfire monitoring on OBD II systems? Oxygen sensor Camshaft position sensor Crankshaft position sensor DPFE sensor Which of the following statements is not true? DTCs that will not affect emissions will never illuminate the MIL. An active or current DTC represents a fault that was detected and occurred during two trips. When a two-trip fault is detected for the second time, a DTC is stored as a pending code. There are some DTCs that will set in one trip.A computer is capable of doing all of the following except. receive input data process input data according to a program and monitor output action control the vehicles operating conditions store data and information Which of the following memory circuits is used to store trouble codes and other temporary information? Read-only memory Programmed read-only memory Random access memory All of the above Technician A says that the oxygen sensor provides the major input during the open-loop mode. Technician B says that the coolant temperature sensor input is not used during open-loop mode operation. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing OBD II systems: Technician A says that the PCM illuminates the MIL if a defect causes emission levels to exceed 2.5 times the emission standards for that model year vehicle. Technician B says that if a misfire condition threatens engine or catalyst damage, the PCM flashes the MIL. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the catalyst efficiency monitor: Technician A says that if the catalytic converter is not reducing emissions properly, the voltage frequency increases on the downstream HO2S. Technician B says that if a fault occurs in the catalyst monitor system on three drive cycles, the MIL will be illuminated. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing monitoring systems: Technician A says that the fuel system monitor checks the shortterm and long-term fuel trims. Technician B says that the heated oxygen sensor monitoring system checks lean-to-rich and rich-to-lean response times. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the comprehensive monitoring system: Technician A says that it tests various input circuits. Technician B says that it tests various output circuits. Who is correct? Technician A Technician B Both A and B Neither A nor B 6ASRQ While discussing diagnostic procedures: Technician A says that after the visual inspection has been performed, the DTCs should be cleared from the memory of the PCM. Technician B says that serial data can be helpful when there are no DTCs but there is a fault in the system. Who is correct? Technician A Technician B Both A and B Neither A nor B Technician A says that the enable criteria are the criteria that must be met before the PCM completes a monitor test. Technician B says that a drive cycle includes operating the vehicle under specific conditions so that a monitor test can be completed. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing PCM monitor tests: Technician A says that the monitor tests are prioritized. Technician B says that the monitor tests are run when the scan tool activates them. Who is correct? Technician A Technician B Both A and B Neither A nor B While discussing the misfire monitor: Technician A says that while detecting type A misfires, the monitor checks cylinder misfiring over a 500-revolution period. Technician B says that while detecting type B misfires, the monitor checks cylinder misfires over a 1,000-revolution period. Who is correct? Technician A Technician B Both A and B Neither A nor B OBD II systems use several modes of operation. List three of them.List the four ways that individual components can be checked.True or False? A bad ground can cause an increase in the reference voltage to a sensor.True or False? An A/F ratio sensor can be tested in the same way as an oxygen sensor.A typical normal oxygen sensor signal will toggle between and volts.6RQ When an engine is running lean, the voltage signal from the oxygen sensor will be (low or high).List six steps involved in performing a visual inspection.Many control systems have operating modes that can be accessed with a scan tool to control the operation of an output. What are the names of the two most common modes for controlling outputs?Which of the following statements about zirconium oxygen sensors is not true? The normal operating range for an O2S is between 0 and 1 volt. If the sensors voltage toggles between 0 volts and 500 millivolts, it is operating normally. The voltage signal from an upstream O2S should have seven cross counts within 5 seconds with the engine running without a load at 2,500 rpm. Engine control systems monitor the activity of the O2S and store a code when the sensors output is not within the desired range.

Page: [1][2][3][4][5]