1.       A wide-band oxygen sensor heater could draw how much current (amperes)?      a. 0.8 to 2 A     b. 2 to 4 A c. 6 to 8 A      d. 8 to 10 A 2.       A wide-band oxygen sensor needs to be heated to what operating temperature?    a. 600°F (315°C) b. 800°F (427°C)    c. 1,400°F (760°C)    d. 2,000°F (1,093°C)

1.       What does the PCM do during a trip to test emissionrelated components? 2.       What is the difference between a type A and type B OBD-II DTC? 3.       What is the difference between a trip and a warm-up cycle? 4.       What could cause the MIL to flash? 5.       A freeze-frame is generated on an OBD-II vehicle ________ .   a. When a type C or D […]

1.       The two internal chambers of a dual-cell wide-band oxygen sensor include ______________ . a. Single and dual    b. Nernst and pump     c. Air reference and diffusion     d. Inside and outside 2.       When the exhaust is rich, the PCM applies a ______________ current into the pump cell.    a. Positive     b. Negative

Two technicians are discussing oil leaks. Technician A says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. Technician B says that a white spray powder can be used to locate oil leaks. Which technician is correct?   a. Technician A only                                b. Technician B only   c. Both Technicians A and B    d. […]

1.       Where is sensor 1, bank 1 located on a V-type engine?    a. On the same bank where number 1 cylinder is located    b. In the exhaust manifold      c. On the bank opposite cylinder number 1    d. Both a and b 2.       A heated zirconia oxygen sensor will have how many wires?    a. Two    b. Three    c. Four    d. Either b or c

1.       How are most superchargers lubricated?   a. By engine oil under pressure through lines from the engine   b. By an internal oil reservoir    c. By greased bearings    d. No lubrication is needed because the incoming air cools the supercharger 2.       How are most turbochargers lubricated?    a. By engine oil under pressure through lines from the engine    b. By an internal oil reservoir    c. By greased […]

1.       When refueling a CNG vehicle, why is it recommended that the tank be filled to a high pressure?   a. The range of the vehicle is increased   b. The cost of the fuel is lower   c. Less of the fuel is lost to evaporation   d. Both a and c 2.       Producing liquid fuel from coal or natural gas usually uses which process?   a. Syncrude    c. […]

1.       What are two types (construction) of MAP sensors? 2.       A typical MAP sensor compares the vacuum in the intake manifold to ______________ .                                 a. Atmospheric pressure    b. A perfect vacuum     c. Barometric pressure    d. The value of the IAT sensor

1.       What accident and rollover devices are installed in a fuel delivery system? 2.       What three methods can be used to test a fuel pump? 3.       The first fuel filter in the sock inside the fuel tank normally filters particles larger than ______________ .      a. 0.001 to 0.003 in.     c. 10 to 20 microns     b. 0.01 to 0.03 in.     d. 70 to 100 microns

1.       Technician A says that a stuck open wastegate can cause the engine to burn oil. Technician B says that a clogged PCV system can cause the engine to burn oil. Which technician is correct?                              a. Technician A only   b. Technician B only   c. Both Technicians A and B   d. Neither Technician A nor B 2.       What service 1.       Technician A says that a stuck […]

1.       Which terminal of the OBD-II data link connector is the signal ground for all vehicles?   a. 1   c. 4   b. 3 d. 5 2.       Terminal 16 of the OBD-II data link connector is used for what?   a. Chassis ground   b. 12 V positive        c. Module (signal ground)    d. Manufacturer’s discretion 3.       What Exactly Is an NTC Sensor? 4.        How does a typical 1.       Which […]

1.       An ignition misfire or fuel mixture problem is an example of what type of DTC?   a. Type A             c. Type C   b. Type B   d. Type D 2.       The comprehensive component monitor checks computercontrolled devices for ________ .                           a. Opens   c. Shorts-to-ground & 1.       An ignition misfire or fuel mixture problem is an example of what type of DTC?   a. Type A             c. Type C   […]

1.       A P0118 DTC is being discussed. Technician A says that the ECT sensor could be shorted internally. Technician B says that the signal wire could be open. Which technician is correct?    a. Technician A only    b. Technician B only    c. Both Technicians A and B     d. Neither Technician A nor B 2.       What are the three ways that temperature sensors can be tested?

1.       Which design of MAP sensor produces a frequency (digital) output signal?      a. Silicon-diaphragm strain gauge     b. Piezoresistivity design     c. Capacitor-capsule      d. Ceramic disc 2.       The frequency output of a digital MAP sensor is reading 114 Hz. What is the approximate engine vacuum?     a. Zero         b. 5 in. Hg       c. 10 1.       Which design of MAP sensor produces a frequency (digital) output signal?      a. Silicon-diaphragm […]

1.       Which terminal of the data link connector does General Motors use for Class 2 communication?     a. 1    c. 3     b. 2    d. 4 2.       GMLAN is the General Motors term for which type of module communication?   a. UART   c. High-speed CAN   b. Class 2   d. Keyword 2000 3.       CAN H and CAN L operate how?   a. CAN H is at 2.5 volts when not […]

1.       If it is tripped, which type of safety device will keep the electric fuel pump from operating?     a. Rollover valve     c. Antisiphoning valve     b. Inertia switch    d. Check valve 2.       Fuel lines are constructed from ______________ .    a. Seamless steel tubing      b. Nylon plastic               c. Copper and/or aluminum tubing& 1.       If it is tripped, which type of safety device will keep the electric fuel […]

1.       Ethanol is also known by what other terms? 2.       The majority of ethanol in the United States is made from what farm products? 3.       How is a flexible fuel vehicle identified? 4.       Methanol is also known by what other terms? 5.       What other gases are often mixed with propane? 6.       Why is it desirable to fill a compressed natural gas (CNG) vehicle with the […]

1.       Methanol is also called ________ .   a. Methyl alcohol   c. Methyl hydrate   b. Wood alcohol   d. All of the above 2.       Which alcohol is dangerous (toxic)?   a. Methanol   b. Ethanol   c. Both ethanol and methanol   d. Neither ethanol nor methanol 3.       Which is the most widely used alternative fuel? a. E85 c. CNG b. Propane d. M85 4.       Liquefied petroleum gas (LPG) is 1.       […]

1.       What is the difference between a stepped and a nonstepped ECT circuit? 2.       What temperature should be displayed on a scan tool if the ECT sensor is unplugged with the key on, engine off? 3.       If the transmission fluid temperature (TFT) sensor were to fail open (as if it were unplugged), what would the PCM do to the transmission shifting points?

1.       By looking at the way diagnostic trouble codes are formatted, which DTC could indicate that the gas cap is loose or defective?   a. P0221   c. P0442   b. P1301                d. P1603 2.       The computer will automatically clear a DTC if there are no additional detected faults after ________ .   a. Forty consecutive warm-up cycles   b. Eighty warm-up cycles   c. Two consecutive trips d. Four key-on/key-off […]

1.       Why are the EGR gases cooled before entering the engine on some engines?   a. Cool exhaust gas is more effective at controlling NOx emissions   b. To help prevent the exhaust from slowing down               c. To prevent damage to the intake valve   d. To prevent heating the air-fuel mixture in the cylinder 2.       The air-fuel mixture flows through the intake manifold on what type of […]

1.       A high O2S voltage could be due to a ______________ .    a. Rich exhaust b. Lean exhaust c. Defective spark plug wire     d. Both a and c 2.       A low O2S voltage could be due to a ______________ .     a. Rich exhaust     b. Lean exhaust     c. Defective spark plug wire     d. Both b and c

1.       What are the reasons why supercharging increases engine power? 2.       How does the bypass valve work on a supercharged engine? 3.       What are the advantages and disadvantages of supercharging? 4.       What are the advantages and disadvantages of turbocharging? 5.       What turbocharger control valves are needed for proper engine operation?

1.       Most fuel filters are designed to remove particles larger than ______________ .    a. 10 microns     c. 70 microns     b. 20 microns     d. 100 microns 2.       The amperage draw of an electric fuel pump is higher than specified. All of the following are possible causes except ______________.     a. Corroded electrical connections at the pump motor    b. Clogged fuel filter    c. Restriction in the 1.       Most […]