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IGNITION SYSTEM EXAM
QUESTIONS WITH ACTUAL
ANSWERS
The ________ connect the coil to the distributor cap center terminal and the distributor cap side terminals to the terminals on the top of the spark plugs. High tension leads A ________ shows all the cylinders firing in sequence. Parade pa?ern Finding breakdowns in coil insulaAon requires the coil to be acAvated and the available voltage to be measured on a(n) ________ and compared to specificaAons. O-scope Tech A says that a lambda greater than 1 means the engine is running rich. Tech B says that the amount of oxygen in the exhaust indicates how rich or lean the mixture is. Who is correct? Tech B Because the value of the self-induced voltage in the ________ is also influenced by the rate of collapse of the magneAc field, which is determined by the rate of change of the current flow through the coil, it is essenAal that the ______ be switched off as quickly as possible. Primary winding;primary current As the staAonary winding of inducAon-type systems is influenced by the magneAc field, a ________ is induced in the winding each Ame the ________ changes. Voltage, magneAc field
Tech A states that modern vehicles make use of a distributor to create the spark. Tech B states that modern vehicles no longer use a distributor. Who is correct? Tech B The power train control module (PCM) must control a high-current fuel pump. The best actuator to use would be a: Relay IgniAon systems operate according to the laws of inducAon observed by: Faraday Tech A says that the posiAve side of the coil primary circuit is switched. Tech B says that the negaAve side of the coil primary circuit is switched. Who is correct? Tech B If the reach is too ________, the piston may strike the spark plug while moving up. Long Tech A says that spark igniAon typically occurs before TDC. Tech B says that spark igniAon typically occurs aXer TDC. Who is correct? Tech A Which component of the contact breaker point igniAon system provides the driver control over system operaAon? The igniAon switch Tech A says that spark plug heat range is how much heat spark plugs can physically handle. Tech B says using the wrong heat range plug can result in spark plug damage. Who is correct? NOT both
A(n) ________ system was a mechanical igniAon system with a switch, called contact breaker points. Contact breaker point igniAon A low firing line indicates low resistance, a short in the circuit, or low compression. True Spark plugs either use a ________ design or a washer type of gasket to form a seal between the spark plug and the cylinder head. Taper Most modern vehicles use a 12-volt lead acid rechargeable ba?ery located in the engine compartment, in the trunk, or under the rear seats. True Some modules are grounded through their ________, so it is important that the module is clean and fastened securely. MounAng hardware Tech A says that engine misfiring will cause a lean exhaust condiAon. Tech B says that engine misfiring can cause overheaAng of the catalyAc converter. Who is correct? NOT both In contact breaker point igniAon systems, the ________ rotates at half the speed of the crankshaX and distributes the high voltage from the igniAon coil and spark plugs. Select one: Distributer ConAnuity is: A conAnuous circuit. The ____ of all the voltage drops in a _____ equals the supply voltage.
Sum; series circuit DSO stands for: Digital storage oscilloscopes Usually, a fuse contains a metal strip that is designed to overheat and melt when subjected to a specified excessive level of current flow, breaking the circuit and stopping the excessive current flow from potenAally damaging the wiring harness and more valuable components. Select one: True Tech A states that CAT raAngs were designed iniAally for automoAve meters. Tech B states that hybrid vehicles typically require meters and test leads rated as CAT III or CAT IV. Who is correct? Tech B Tech A says that a relay is a one-way electrical check valve used in alternators to change AC into DC. Tech B says that a relay uses electromagneAsm to open or close a switch. Who is correct? Tech B Jumper leads are used to extend connecAons Any of the above In a good circuit, the resistance of the _____ is very low, causing small and insignificant amounts of voltage drop. All of the above High-voltage systems have a number of advantages over low-voltage systems, including: All of the above When taking DC current measurements, always remember that an ammeter must be connected in ______________ within the circuit.
that the second capacitor is fully charged. Technician B states that this could indicate that the lamp is burned out. Which technician is correct? Tech A Tech A says a resistor is a component designed to extract energy from the current flow. Tech B says he uses a voltmeter to check for a voltage drop. Who is correct? Both The reducAon in voltage and current to the load ____________ the amount of electrical power to the load, affecAng its performance. Reduces A 20:1 a?enuator divides the amount of voltage passing through it by a factor of 20. Thus, 20 volts _____ will appear as an _____ of 1 volt. Input and output Tech A says in a parallel circuit, the more branches that are added, the more current flow increases. Tech B says a series-parallel circuit is made of parallel circuits only. Who is correct? Tech A Tech A says an example of a series-parallel circuit is the brake light circuit. Tech B says when tesAng, you only need to consider the voltage drop across the parallel branch. Who is correct? Tech A All these statements are true about protecAon devices EXCEPT: You should always replace blown fuses with a fuse of a higher amp raAng _______ circuits are found in vehicles, such as in dash light dimmer circuits, although they are not as common as _______ circuits. The correct answer is: Series-parallel; parallel
Two technicians are discussing a series light circuit. Technician A states that if the fuse blows, available voltage aXer the fuse will be 0 volts. Technician B states that the voltage drop over the fuse will be 0 volts. Which technician is correct? Tech A When doing a voltage drop test, you should do all these EXCEPT: Remove the posiAve ba?ery cable. Technician A says an oscilloscope is commonly referred to as a lab scope or just scope. Technician B says lab scopes are not very important test instruments in a modern automobile. Who is correct? Tech A The DVOM can be connected in various parts of a series circuit to measure the current flow. True A(n) ________ may be used to check signal voltages from sensors used on the vehicle warning devices. Either A or B The advent of digital technology has given rise to higher powered processors that allow be?er control and monitoring of the systems on the vehicle, including the fuel injecAon system. True The mass air-flow sensor can measure the air entering the engine down to a(n) _____________ per second. Gram If it is an inducAve-type sensor, use an ohmmeter to read ________. Resistance
The ________ secAon of a PCM contains the soXware for the computer, as well as a place to retain diagnosAc trouble codes (dtcs), freeze-frame data, and learned data. Memory and storage VariaAon in pulse width at a fixed frequency is called: Pulse width modulaAon The barometric pressure (BARO) sensor works in conjuncAon with the: MAP In many cases, the soXware in the PCM's memory can be updated by uploading soXware updates, called a ________ process. Reflash Tech A says that any vehicle made aXer 1976 will use two oxygen sensors. Tech B says that oxygen sensors are located in the intake manifold. Who is correct? Niether The potenAometer can be linear or circular in construcAon and has ________electrical connecAng points. 3 Inputs to the PCM include ______________ and the air-condiAoning switch. All of the above A lean air fuel mixture has less air in proporAon to the amount of fuel. False Which node of the PCM translates informaAon from, or to, the other networks so that it can be shared between networks? Gateway node Tech A states that digital signals are conAnuously variable, typically changing in strength and Ame. Tech B states that an analog signal is a direct on/off with no in-between transiAon. Who is correct?
Neither Electronic fuel injecAon and engine management systems can adjust the ________mixture within certain limits as parts wear and thereby maintain proper control of the air fuel raAo over a broad range of condiAons. Air fuel The ________ of a PCM typically sends either simple on/off signals or pulse width-modulated signals to the actuators, depending on the actuator being controlled. Output drivers secAon Ideally, combusAon would completely burn all of the fuel that entered the cylinder, extracAng the maximum thermal energy from the gasoline. True The PCM of an engine is comprised of all of the following parts EXCEPT: Feedback control secAon The on and off Ame of a stepper motor relates to its duty cycle, which is generally expressed as a: Percentage Tech A states that the PCM has the ability to learn from its acAons and to use that informaAon to make be?er decisions in the future. Tech B states that it can also perform basic self-diagnosAcs on virtually all of the components in the system. Who is correct? Both In automoAve applicaAons, the circular form is commonly used as a thro?le posiAon sensor, with the center contact a?ached to the thro?le plate. True When cycled very quickly, digital signals can be used to create a(n) ________, similar to the variable control provided by an analog signal.
