EP2 midterm
A switching sensor can be checked for proper operation with a(n)_______. A. impedance tester B. ohmmeter C. voltmeter D. flowmeter
B
A wiggle test is being A performs this test with the engine performed on an automotive computer system. Technician off and the ignition key off. Technician B performs this test with the engine off and the ignition key on. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
B
Most automotive computer systems use a signal amplitude of about _____ volts. A. 0.5-2 В. 3-5 C. 6-7.5 D. 12
B
Technician A says a switch diagnostic test involves energizing specific output devices. Technician B says an actuator diagnostic test involves the scan tool giving orders to the vehicle's computer. Who is right? A. A only. C. Both A and B. B. B only. D. Neither A nor B.
B
Technician A says that about 50% of all automotive engine performance problems are caused by the computer system. Technician B says that about 80% of all autemotive engine performance problems are caused by something other than the computer system malfunction. A. A only. C. Both A and B. 1. 3 only. D. Neither A nor B.
B
Technician A says that both OBD I and OBD II systems will pinpoint a sensor that is operating poorly or incorrectly. Technician B says that OBD I will only indicate that a circuit is no longer operating properly. Who is right? A. A only. L. Bonly. C. Both A and B. D. Neither A nor B.
B
Technician A says the numbers 1 and 2 are used in the binary numbering system. Technician B says the numbers 0 and 1 are used in the binary numbering system. Who is right? C. Both A and B. A. A only. D. Neither A nor B. B. B only.
B
Technician A says the term "Gate" refers to an electronic circuit that stops current from flowing in a narticular direction. Technician B says the term "Gate" refers to an electronic circuit that produces a specific output voltage for given input voltages. Who is right? C. Both A and B. A. A only. D. Neither A nor B. В. B only.
B
Technician A says the term "cybernetics" refers to the study of how chemical-mechanical devices can duplicate the action of the human body.Technician B says term "cybernetics" refers to the study of how electrical-mechanical devices can duplicate the action of the human body. Who is right? A. A only. C. Both A and B. В. В only. D. Neither A nor B.
B
Teehnician A says the term "hard failure" refers to an intermittent automotive computer problem. Technician B says the term automotive computer problem. Who is right? "hard failure" refers to a constant automotive computer problem. A. A only. C. Both A and B. D. Neither A nor B.
B
The data link connector for an OBD II system most often will be located _______. A behind the front bumper B. under the dash or center console, near the driver's seat C. behind the dash on the passenger's side of the vehicle D. on the firewall, inside the engine compartment
B
The malfunction indicator light in an OBD Il system is flashing. Technician A says that this simply indicates a soft problem. Technician B says this means the problem could be damaging the catalytic converter. Who is right? A. A only. B. Bonly. C. Both A and B. D Neither A nor B.
B
Which type of computer memory loses its contents if power is interrupted? A. EPROM, В. RAM. C. ROM. D. KAM,
B
While testing a passive sensor with a voltmeter, you find that the censor is incorrect, but the voltage measured at the computer is correct. Where is the problem likely to reference voltage being supplied to the be? A. Sensor. B. Wiring harness. C. Voltmeter. D. Computer.
B
The most common cause of electrical-related problems in a computer system is poor ______.
Electrical connections
Before reprogramming most computers, you must first ______ the existing information.
Erase
TRUE/FALSE A dinenostic tablet must stay plugged into the vehicle to receive data stream values and trouble codes
False
TRUE/FALSE IE the resistance of a variable resistance sensor is within specifications, you should suspect the computer as the source of the problem.
False
TRUE/FALSE Pinpoint tests are wiring checks that are done by piercing wires with sharply pointed meter probes.
False
TRUE/FALSE Trouble codes will tell you which part or circuit is causing the problem.
False
True/False A solenoid is an actuator that reacts to a small control signal from the computer to control a much higher current flow to large components or systems.
False
True/False Approximately 80% of all engine performance problems are caused by computer malfunctions.
False
True/False In most cases, trouble codes will be automatically erased after 20-30 engine starts or warm-ups.
False
True/False Semiconductor devices are not damaged by static electricity.
False
TRUE/FALSE Beginning with the 2011 model year, diagnostic systems in all new vehicles were required to be CAN-compliant.
Fulse
TRUE/FALSE In the binary system, I designates off and 0 designates on.
Fulse
TRUE/FALSE The three stages of computer operation are input, programming, and output.
Fulse
A passive sensor can change its internal ________ with a change in system or vehicle condition or operation.
Resistance
The wiring diagram or ________ for the computer system is found in a shop manual.
Schematic
When testing a(n) _______ sensor, the ohmmeter should register as infinite ohms then zero ohms
Switching
TRUE/FALSE A modern scan tool allows the technician to monitor operating conditions while performing a test-drive
True
TRUE/FALSE A scan tool is now the most important tool used by automobile technicians
True
TRUE/FALSE A scen tool is now the most important tool of the automobile technician.
True
TRUE/FALSE An active sensor is one that generates its own voltage signal.
True
TRUE/FALSE Automotive computers can be located in the passenger or engine compartment, in the trunk, or under the seats.
True
TRUE/FALSE Disconnecting computer wiring with the ignition key on can cause damage to the computer.
True
TRUE/FALSE EEPROM chips are usually soldered to the computer's circuit board and therefore not removable.
True
TRUE/FALSE If moisture gets into an electrical connector, it can cause high resistance.
True
TRUE/FALSE OBD II requires all automotive manufacturers to use a set of standardized trouble codes.
True
TRUE/FALSE Since they have moving contact points, relays are often a source of computer system problems.
True
TRUE/FALSE The interaction between the different computers in a vehicle's computer network is referred to as multiplexing.
True
TRUE/FALSE The term microprocessor means small computer.
True
TRUE/FALSE Vacuum leaks can affect the operation of a vehicle's computer system.
True
TRUE/FALSE Wheel speed sensors provide necessary information for the anti-lock braking system.
True
TRUE/FALSE When troubleshooting, you should always check for conventional or simple problems first.
True
True/False A well-trained technician must be versed in on-board diagnostics to troubleshoot and repair today's vehicles.
True
True/False Key-on/engine-off diagnostics allow the technician to check for trouble codes
True
True/False Key-on/engine-on diagnostics are performed with the engine running at full operating temperature.
True
True/False Using an incorrect sealant can poison an oxygen sensor.
True
True/False You should always correct the cause of the lowest number diagnostic trouble code first.
True
A passive sensor depends on an external source of ________ to return a signal to the computer.
Voltage
A period of vehicle operation during which the computer system adapts to new components and programming information is called the _______. A. relearn procedure B. break-in period C. teaching sequence D. recalibration procedure
A
A trouble code is triggered in an automotive computer system. Technician A says fuel-contaminated engine oil could possibly trigger this trouble code. Technician B says fuel-contaminated engine oil has no effect on computer system operation. Who is right? A. A only. В. В only. C. Both A and B. D. Neither A nor B.
A
An automobile has a small fuel tank leak. Technician A says this problem may activate the car's computer system "malfunction indicator light". Technician B says this type of problem has no effect on the car's computer system. Who is right? A. A only. C. Both A and B. B Bonly. D. Neither A nor B.
A
Technician A says a spark plug misfire can affect the operation of an automotive computer system. Technician B says an automotive computer system is not affected by a spark plug misfire. Who is right? A. A only. B. B only. C. Both A and B. D. Neither A nor B.
A
Technician A says an IC is an electrical circuit that has been reduced in size and etched on the surface of semiconductor chip. Technician B says an IC is a small power transistor, amplifier circuit for increasing output strength. Who is right? A. A only. C. Both A and B. в. В only. D. Neither A nor B.
A
Technician A says both inputs of an AND gate must be one (1) to produce an output. Technician B says both inputs of an AND gate must be zero (0) to produce an output. Who is right? A. A only. В. В only. C. Both A and B. D. Neither A nor B.
A
Technician A says if an automotive computer system detects an abnormal condition, the car's malfunction indicator light will normally be activated. Technician B says if an automotive computer system detects an abnormal condition the car's low oil warning light will normally be activated. Who is right? A. A only. C. Both Aand B. b. B only. D. Neither A nor B.
A
Technician A says in computer language a 0 or I is called a bit. Technician B says in computer language a 0 or 1 is called a byte. Who is right? A. A only, В. В only. C. Both A and B. D. Neither A nor B.
A
Technician A says that wearing an anti-static wrist strap is an effective means of preventing damage when working on computer circuits. Technician B says that disconnecting the vehicle's battery is sufficient. Who is right? A. A only. В. B only. C. Both A and B. D. Neither A nor B.
A
The malfunction indicator light in an OBD II system is flashing. Technician A says this means the problem could be damaging the catalytic converter. Technician B says that this simply indicates a soft problem. Who is right? A. A only. С. Both A and B. B. B only. D. Neither A nor B.
A
Which of the following are known as the "linking cells" of the human brain? A. Neurons. B. Protons. C. Neutrons. D. Electrons
A
A properly operating magnetic sensor should generate about ______. A. 1.5-3 volts de В. 3-5 volts ac C. 1.5-3 volts ac D. 3-5 volts de
C
An oxygen sensor tested faulty and must be replaced. Technician A says to use a sealant that is safe for oxygen sensors on the threads. Technician B says to use a sensor socket to prevent sensor damage. Who is right? A. A only. В. Bonly. C. Both A and B. D. Neither A nor B.
C
In which type of logic gate must both inputs be "on" to produce an output voltage? A. NOT B. NAND. C. AND. D. OR.
C
Technician A says a faulty actuator can affect the operation of an automotive computer system. Technician B says a leaking vacuum hose can affect the operation of an automotive computer system. Who is right? A. A only. C. Both A and B. B. B only. D. Neither A nor B.,
C
Technician A says an automotive computer can scan its input and output circuits to detect incorrect voltage problems. Technician B says an automotive computer can scan its input and output circuits to detect an incorrect resistance problem. Who is right? A. A only. C. Both A and B. b. B only. D. Neither A nor B.
C
Technician A says that a passive sensor can be tested by applving a reference voltage and measuring the voltage drop across the sensor. Technician B says that a passive sensor can be tested by using an ohmmeter to measure its internal resistance. Who is right? A. A only. В. В only. C. Both A and B. D. Neither A nor B.
C
The advantages of computers in late-model vehicles are being discussed. Technician A says computers can compensate for mechanical wear. Technician B says computer systems have onboard diagnostic systems that can detect and record system problems. Who is right? A. A only. C. Both A and B. B. B only. D. Neither A nor B.
C
Which of the binary numbers below is equal to 6 in the decimal system of notation? A. 0111 В. 1110 С. 0110 D. 1111
C
Which of the following is another name for an automotive computer? A. Electronic Control Unit. B. Electronic Control Module. C. Electronic Control Assembly. D. All of the above.
D
Which of the following is not a type of computer memory? A. ROM. B. RAM. C. PROM. D. PRAM.
D
An OBD II system will identify problems with all the components listed except _____. A. battery temperature sensor B. ignition coil C. Oxygen sensor D. starter solenoid
D
The number I appearing as the first digit in an OBD Il trouble code indicates that the trouble ond is ______. A. manufacturer-designated B. standard (SAE) C. system-specific D. nonuniform
D
The use of heat, cold, or moisture to simulate extreme operating conditions of components is called ______. A. component isolation B. environmental testing C. system checking D. stress testing
D
To comply with the Clean Air Act of 1977, "self-adjusting" engines were introduced in ______. A. 1978 B. 1979 C. 1980 D. 1981
D
__________ numbers identify the location and purpose of each terminal in a computer wiring harness connector.
Pin
