Mindtap For Erjavec/thompson's Automotive Technology: A Systems Approach, 4 Terms Printed Access Card (mindtap Course List)
7th Edition
ISBN: 9781337794381
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 25, Problem 4SA
When an engine is running lean, the voltage signal from the oxygen sensor will be (low or high).
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While 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 B
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Chapter 25 Solutions
Mindtap For Erjavec/thompson's Automotive Technology: A Systems Approach, 4 Terms Printed Access Card (mindtap Course List)
Ch. 25 - OBD II systems use several modes of operation....Ch. 25 - List the four ways that individual components can...Ch. 25 - Prob. 3SACh. 25 - When an engine is running lean, the voltage signal...Ch. 25 - List six steps involved in performing a visual...Ch. 25 - Many control systems have operating modes that can...Ch. 25 - True or False? A bad ground can cause an increase...Ch. 25 - True or False? An A/F ratio sensor can be tested...Ch. 25 - Which of the following statements about zirconium...Ch. 25 - A system may fail the catalyst monitor test for...
Ch. 25 - A defective LAT sensor or circuit may cause the...Ch. 25 - Which of the following is the least likely cause...Ch. 25 - Technician A says that an oxygen sensor can be a...Ch. 25 - Prob. 2ASRQCh. 25 - While discussing ECT sensor diagnosis: Technician...Ch. 25 - While discussing Hall-effect vehicle speed sensor...Ch. 25 - While discussing TP sensor diagnosis: Technician A...Ch. 25 - While diagnosing the cause of a hard starting...Ch. 25 - While discussing testing OBD II system components:...Ch. 25 - When testing a frequency varying MAF: Technician A...Ch. 25 - Technician A says that a faulty MAF sensor can...Ch. 25 - While discussing the MIL on OBD 11 systems:...
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- Describe the purpose of having both upstream and downstream oxygen sensors in an exhaust system.arrow_forwardTrue or False? The signals from an air-fuel ratio sensor are identical to those from a conventional oxygen sensor.arrow_forwardExplain how the computer controls the air-fuel ratio on an EFI system.arrow_forward
- 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_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_forwardTechnician A says that the oxygen sensor provides the major input during the open-loop mode. Technician B says that the coolant temperature sensor input is not used during open-loop mode operation. Who is correct?arrow_forward
- Technician A says that the oxygen sensor provides the major input during the open-loop mode.technician B says that the coolant temperature sensor input is not used during open loop mode operation. Who is correct?arrow_forwardWhile 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? * 1 point a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardBecause modern engines heat up rapidly heated oxygen sensor (ho2s) are not required. True Falsearrow_forward
- How does the thermocouple sensor work?arrow_forwardWhat is the correct procedure for checking an oxygen sensor with a DMM?arrow_forwardECU collects and processes signals from O various engine sensors. controls the fuel level in the fuel tank. O O controls the engine lubrication. O controls the engine oil level. O controls the coolant in the engine.arrow_forward
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