Drivability Practice Exam

These questions are part of the practice quiz. Start practicing

• Select the fuel injection type shown.
• What drivability issues can a failing fuel pump cause, even if the engine starts?
• Which type of fuel pump may mount inside the fuel tank?
• How can a rich condition persist under closed-loop operation, and what live-data clues would you look for?
• Open loop uses programmed data.
• Which injector type uses a flat, round plate that seats onto the flat valve seat?
• Which part serves as the passageway for fresh air that enters the throttle body?
• What thermostat code P0128 indicates, and how it affects drivability?
• The MAP sensor provides delayed manifold pressure information to the engine's ECM.
• In a DC electric motor, which component is the rotating assembly that carries the winding and conducts current to it?
• Gauges with smaller increments are more accurate.
• If both banks lean (P0171/P0174 on both banks) but no vacuum leaks, which fault is most likely?
• The ____________ pulls the injector valve back to release fuel from the nozzle.
• After a compression test, low readings in multiple cylinders most likely indicate which issue?
• Which injector type receives fuel below the armature?
• Which part provides the transition from the intake manifold to the intake ports?
• What is a key advantage of smoke testing for vacuum leaks compared to spray methods?
• What is a recommended method to diagnose an EVAP leak and verify purge valve operation?
• Which injector component atomizes the fuel in a specific pattern?
• Which component maintains system pressure?
• Which is a typical sign of a defective throttle position sensor when analyzing live data of pedal position versus throttle angle?
• How would you diagnose O2 sensor related issues using data from a scan tool?
• Which item allows connection of the gauge hose to fuel test ports and fuel line fittings?
• Which component is the cold start injector in the CIS?
• In which transformation does voltage increase?
• To check the cold start system, you should start with a warm engine. True or False?
• What is the primary role of the oxygen sensor in closed-loop fuel control?
• How does a faulty downstream O2 sensor (post-cat) affect drivability and fuel trims?
• Which data would you review to assess LTFT and STFT during misfire diagnosis?
• Which descriptor indicates vehicle area such as chassis or communications?
• The primary coil energizes in which circuit?
• Which diagnostic tool is used to measure electrical signals in CIS diagnostics?
• Which statement about sensor plate movement and mixture adjustments is correct?
• During a drivability test drive, how can you differentiate fuel delivery problems from ignition problems?
• Which type of spark plug prevents electronic noise from interfering with the ignition system?
• Which type of fuel pump is most commonly used in carbureted engines?
• Which impeller type is described as using rotating bearings?
• The ECM runs in open loop during cold starting.
• The MAP sensor is never used in an internal combustion engine's electronic control system.
• One main scan tool is used with OBD I.
• Which additive helps keep the fuel lines from freezing?
• What is a primary indication that an ignition coil may be failing?
• Vacuum gauges are typically marked in inches of what?
• How can a dirty throttle body or sticky IAC valve produce idle instability, and what corrective steps would you take?
• Self-induced voltage is the result of
• Which term correctly identifies the component pictured as a camshaft?
• Which component sprays fuel continuously?
• Technician A says that increasing a conductor's speed through an electromagnetic field decreases the possible induced voltage. Technician B says that ignition systems use a step-up transformer to produce enough voltage for ignition spark. Which technician is correct?
• Distinguish between short-term fuel trim and long-term fuel trim, and describe how extreme readings can indicate problems.
• Which item displays the amount of pressure present?
• How does altitude affect fuel trims and drivability?
• Which component is connected to a lever that transfers movement?
• Which descriptor indicates specific fault or fault area?
• Which impeller type uses fan-shaped blades and delivers large volumes of fuel at high RPM?
• In a mechanical fuel pump, what drives the pumping action?
• What is the main function of the automotive fuel pump?
• Select the fuel injection type shown.
• Which data is most useful to assess catalyst performance when diagnosing O2 sensor issues?
• This is used in older systems.
• What is a practical way to verify whether an ignition coil is faulty?
• Which fuel injection type fires injectors in the firing order?
• The ignition system must produce sufficient voltage to ensure proper combustion.
• The vacuum gauge measures air pressure that is ______ atmospheric pressure.
• During a fuel pressure test, readings higher than spec while the engine is running are observed. What does this most likely indicate?
• What is the function of crankshaft and camshaft position sensors, and what symptoms occur if they fail?
• Which item purges air from hose during testing?
• True or False: The digital multimeter is the standard tool for diagnosing electrical signals in CIS?
• What is the purpose of the oxygen sensor heater circuit and what happens if it fails?
• The IAT sensor is found on carbureted engines.
• In engine valve-train terminology, which component transfers camshaft motion to the valve?
• Which live data comparison is used to verify TPS behavior?
• What is the role of wiring harness faults in drivability and how can you diagnose them?
• Which injector component receives the fuel from the fuel rail?
• The check engine light indicates an engine malfunction.
• Which component directs the fuel to the injectors?
• OBD I systems use a check engine light to indicate concerns.
• Electric fuel pumps are typically energized by which control method?
• Closed loop uses precise fuel delivery.
• Valves release pressure after testing.
• Idle speed is set with which adjustment in this system?
• What is the purpose of the EGR system, and what drivability symptoms suggest EGR problems?
• Engines that use a MAP sensor are typically fuel injected.
• What is the recommended diagnostic approach when you see a P0300 with no clear spark or fuel problem?
• Which feature can help hoses fit different diameters?
• What is an Idle Air Control (IAC) valve and what symptoms suggest a faulty IAC?
• In a DC electric motor used in a fuel pump, which component provides the rotating electrical connection to the external circuit?
• Which fuel injection system uses a control module to control timing?
• MAP sensor's role in engine management?
• Which item in the injector assembly is the electrical connector?
• Why might a catalytic converter code not always result in rough idle, and what does this imply for drivability testing?
• Which injector component forces the valve to open when the injector energizes?
• In diagnostic trouble code categorization, which descriptor indicates a major vehicle system such as engine control and body control?
• The ________ controls the PWM signal sent to the fuel injectors.
• When diagnosing CIS, what is the recommended reference source?
• If the MAP sensor is providing incorrect readings, which symptom is most likely?
• Which EVAP code indicates a large leak?
• What is a misfire counter and how would you use it in diagnosing drivability issues?
• Which component is located in the fuel distributor and moves up and down?
• In a diaphragm-type fuel pump, what is the flexible membrane called?
• Which type of fuel injection is commonly used in many diesel engines?
• If crankshaft or camshaft position sensors fail, which symptom is most likely?
• What are three common non-fuel-system causes of a lean condition (P0171/P0174)?
• The dwell determines the length of time that the primary coil builds its magnetic field.
• The greater the spark plug gap, the greater the need for the ignition system to produce a higher secondary voltage.
• The IAT sensor is found on carbureted engines.
• Which transformer configuration has more turns in the primary winding?
• Which term correctly identifies the component pictured as a pintle?
• How do you approach a hot-start stall that does not occur when cold?
• How can you identify a vacuum leak using a baseline scan and a smoke test?
• Which component removes particles from the air, protecting the engine?
• The DMM is used to check for low fuel pressure. True or False?
• Which condition best explains a hot-start stall caused by vapor lock and heat soak?
• What idle and drivability signs typically point to a vacuum leak?
• What is the primary function of a vacuum gauge?
• Which gauge is typically used on carbureted engines?
• If the sensor plate is not moving freely, what is a likely consequence for CIS performance?
• Differentiate between narrowband oxygen sensors and wideband oxygen sensors and state when each is used.
• Which of the following is a typical sign of a faulty MAF sensor?
• The __________ may spray fuel in different patterns.
• Which injector type uses crystal wafers to move the valve?
• Which option best describes common causes and symptoms of a dirty MAF sensor?
• The bourdon tube expands and moves the needle.
• What would be an indicator of a faulty MAF sensor causing lean condition?
• Which injector component energizes when the ECM completes the circuit?
• What safety precautions should you follow when performing fuel-system diagnostics?
• Which type of fuel pump is most commonly used in fuel-injected engines?
• In a DC motor, which component provides stationary electrical contact with the rotating commutator?
• In which circuit does the current flow through the primary winding stop?
• Explain the purpose and typical diagnostic steps for EVAP leaks with small leaks (P0456) versus large leaks (P0455).
• Which part meters the amount of air that enters the engine?
• Which injection type fires injectors not in a fixed order, potentially in any sequence?
• Adapters are at the end of the hose and connect to the intake manifold.
• How would you identify a vacuum leak using a spray test around suspects while observing RPM changes?
• Which sensor measures manifold pressure to the ECM?
• Which sensor measures air mass entering the engine?
• The flux of an electromagnetic field will ___________ as you increase the number of turns around the core.
• Which injector component contains terminals that allow electrical current to enter the injector?
• The IAT sensor is typically located in or near the air cleaner assembly on fuel-injected engines.
• Which component is located on the fuel distributor and responds to varying electrical current?
• What test is commonly used to confirm a leaking fuel injector?
• In closed-loop operation, what is the purpose of a wideband O2 sensor?
• Which term correctly identifies the component pictured as a ball?
• Which component includes a bimetallic strip?
• Which gauge is used on fuel-injected engines?
• What is the purpose of a compression test in drivability diagnosis, and what results indicate a problem?
• Where should the pressure gauge be connected when diagnosing the CIS?
• What is a recommended approach to a systematic drivability diagnostic workflow?
• Which transformer configuration has more turns in the secondary winding?
• This uses a governor to control timing.
• Which type of fuel pump may mount to the engine?
• In a drivability diagnostic workflow, what is the purpose of performing baseline tests?
• Which component absorbs fuel system pulsations?
• Which list correctly identifies the four main parts of the described fuel delivery system?
• Which component is most closely associated with air metering in the metering unit?
• P0420 and P0430 indicate a problem with the catalytic converter and are typically associated with which drivability symptoms?
• A MIL is flashing in an OBD II vehicle. Technician A says that a flashing MIL indicates a possible catalyst-damaging concern. Technician B says that a flashing MIL indicates that the vehicle must be serviced immediately. Which technician is correct?
• In an electromagnetic solenoid injector, magnetism pulls the injector valve open when __________.
• Which device operates a thermo switch?
• This uses pulse width modulation to control injectors.
• In a closed loop system, what provides feedback to adjust fuel delivery?
• In a fuel injector spray pattern test, which issue is most directly indicated by a mis-spray?
• __________ induction occurs when a change in the coil's magnetic field transforms voltage in an adjacent coil.
• This can be used in modern systems.
• Which component absorbs fuel system pulsations?
• How can brake booster vacuum leaks impact drivability tests and how can you confirm them?
• How do turbocharger or supercharger issues manifest as drivability problems?
• Which component provides the restoring force behind the diaphragm in a diaphragm-type fuel pump?
• Describe the proper procedure to perform a fuel pressure test and how to interpret the results?
• Which component is primarily responsible for distributing fuel to the injectors during normal operation?
• What is the role of the EVAP system in drivability, and which codes indicate leaks?
• Which component delivers the air from the throttle body to the intake runners?
• What is the difference between a lean condition caused by MAF sensor fault versus a vacuum leak in terms of live data signatures?
• In which transformation does voltage decrease?
• Which statement best describes how MAF and MAP sensors differ and what diagnostic clue would indicate a dirty MAF?
• Which statement accurately reflects the advantage of using a smoke test over traditional spray methods for vacuum leaks?
• What is the role of the MAP sensor and how would you verify it is providing correct readings?
• Open loop system fuel delivery is based on which option?
• In a diaphragm-type fuel pump, what is the space behind the diaphragm called?
• How does ignition timing affect engine performance and drivability?
• Which statement correctly pairs the system with its characteristic?
• Incorrect ignition timing can cause which of the following outcomes?
• Which term refers to a liquefied gas that must be stored in a pressurized container?
• What do DTC readiness monitors indicate in a drivability diagnosis?
• In which circuit do magnetic fields collapse and secondary winding energizes?
• During a fuel injector spray pattern test, which finding would best indicate a problem with the injector?
• In a basic fuel system, which component opens to allow fuel to spray into the intake ports?
• From the listed injector components, which item is the return spring?
• During which condition does the ECM cut off fuel delivery to prevent stalling?
• How do bank-specific lean codes (P0171/P0174) help narrow down the fault?
• What is closed-loop fuel control and why is it essential for drivability?
• Which fuel injection type is gasoline direct injection?
• Which fuel injection type uses a throttle body to inject fuel?
• The digital multimeter (DMM) is used to check and adjust the lambda control. True or False?
• What is the recommended approach to verify purge valve operation during EVAP leak diagnosis?
• Which component relays the temperature of incoming air to the engine?
• Which component relays air flow information to the engine control module?
• What steps would you take to diagnose a P0300 misfire condition?
• Low-pressure hoses use crimped fittings.
• Which term correctly identifies the component pictured as a disc?
• OBD I used standardized DTCs.
• IAT sensor true statement regarding location?
• What drivability concerns are associated with worn spark plugs, and what should be inspected when changing them?
• Which injector component opens to allow fuel to spray?
• Which type of fittings do low-pressure hoses use?
• What components control fuel flow into and out of a pump chamber?
• If DTC readiness monitors show not ready during a drivability diagnosis, which limitation applies?
• The ECM goes into limp home mode when it recognizes a failure, and it continues to operate using limited parameters.
• The ________ energizes when the injector driver completes the circuit.
• Which descriptor indicates a generic or manufacturer-specific code?
• What does P0101 indicate about the MAF circuit, and how would you address it?
• Which fuel injection strategy is the most inefficient use of fuel?
• The MAF sensor is located in the ductwork before the throttle body assembly.
• Technician A says burn time can be measured using an oscilloscope. Technician B says that if the burn time is too long, there is low secondary resistance. Which technician is correct?
• Which method is typically used to detect large EVAP leaks (P0455)?
• Which injector component captures tiny particles from the fuel?
• If a fuel pressure test shows pressure higher than spec while the engine is running, what is the most likely issue?
• How do the symptoms differ between an EGR stuck open and an EGR stuck closed?
• Which component carries the fuel through the system?
• Which component reports the fuel level in the tank?
• When inspecting for vacuum leaks, which components are most likely culprits to check first?
• A leaking cold start injector can cause hard starting when cold. True or False?