Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 24, Problem 6RQ
Describe the purpose of having both upstream and downstream oxygen sensors in an exhaust system.
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While discussing EFI systems: Technician A says that the PCM provides the proper air-fuel ratio by controlling the fuel pressure. Technician B says that the PCM provides the proper air-fuel ratio by controlling injector pulse width. Who is correct? *
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a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B
Explain All Air Systems
Explain Components of HVAC (Central)
Excessive oxygen in the exhaust indicates an improper air/fuel mixture.
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Chapter 24 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 24 - Describe the difference between an open- and a...Ch. 24 - Explain the use and importance of system strategy...Ch. 24 - Describe an OBD II warm-up cycle.Ch. 24 - Explain the trip and drive cycle in an OBD II...Ch. 24 - Describe how engine misfire is detected in an OBD...Ch. 24 - Describe the purpose of having both upstream and...Ch. 24 - Briefly describe the monitors in an OBD II system.Ch. 24 - Type B engine misfires are excessive if the...Ch. 24 - The monitor system checks the action of the can...Ch. 24 - The monitor system has a(n) and test to check the...
Ch. 24 - The fuel monitor checks fuel trim and fuel trim.Ch. 24 - Which sensor is used for misfire monitoring on OBD...Ch. 24 - Which of the following statements is not true?...Ch. 24 - A computer is capable of doing all of the...Ch. 24 - Which of the following memory circuits is used to...Ch. 24 - Technician A says that the oxygen sensor provides...Ch. 24 - While discussing OBD II systems: Technician A says...Ch. 24 - While discussing the catalyst efficiency monitor:...Ch. 24 - While discussing monitoring systems: Technician A...Ch. 24 - While discussing the comprehensive monitoring...Ch. 24 - Prob. 6ASRQCh. 24 - While discussing diagnostic procedures: Technician...Ch. 24 - Technician A says that the enable criteria are the...Ch. 24 - While discussing PCM monitor tests: Technician A...Ch. 24 - While discussing the misfire monitor: Technician A...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- When the engine is idling, the pressure regulator in a PFI system provides ____fuel pressure compared to the fuel pressure at wide-open throttle.arrow_forwardExplain how the computer controls the air-fuel ratio on an EFI system.arrow_forwardWhat is the advantage of a variable intake system and what inputs are required by the ECM?arrow_forward
- List four service precautions for working on thefuel injection systemarrow_forwardTrue or False? The signals from an air-fuel ratio sensor are identical to those from a conventional oxygen sensor.arrow_forwardWhile discussing EGR systems with a differentialpressure feedback electronic (DPFE) sensor: TechnicianA says that the DPFE sensor sends a signal to thePCM in relation to intake manifold pressure. TechnicianB says that the PCM corrects the EGR flow if theactual flow does not match the requested flow. Who iscorrect?a. Technician A onlyb. Technician B onlyc. Both A and Bd. Neither A nor Barrow_forward
- Explain why a height-sensing proportioning valve is required on some vehicles.arrow_forwardTechnician A says there is less heat energy in high octane gasoline and, therefore less power is genorated during combustion. Technician B says usung a higher octane gasoline than required will not produce more power inless the engine has a knock sensor that allows the system to adjust ignition timing to take advantage of the higher octane. who is correct?arrow_forwardexplain the purpose of the relief valve and one way check valve in an electric fuel pump.arrow_forward
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