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 25, Problem 14RQ
A defective LAT sensor or circuit may cause the fol lowing problems, except.
- hard engine starting
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Technician 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?
Which is not a cause of detonation?
Wrong ignition timing
Allowing the engine to overheat
Fuel/air mixture too lean
Using a fuel grade higher than recommended
Lower compression ratios reduce NOx emissions.
True
False
Chapter 25 Solutions
Automotive Technology: A Systems Approach (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 - 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 - A typical normal oxygen sensor signal will toggle...Ch. 25 - Prob. 6RQCh. 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 - Which of the following statements about zirconium...
Ch. 25 - Describe the typical procedure for adjusting a TP...Ch. 25 - Why does the rotor for a CKP have one or more...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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- Which of the following is the least likely cause of a no-start condition? Faulty CKP sensor Faulty KS Fuel or ignition system faults Faulty PCM wiringarrow_forwardTrue or False? Engine misfires can cause a catalytic converter to overheat.arrow_forwardA restricted catalytic converter can cause all of the following except. a. stalling after the engine starts b. popping or backfiring through the intake manifold c. a drop in engine vacuum d. increased power at high speedsarrow_forward
- While discussing the catalyst efficiency monitor: Technician A says that if the catalytic converter is not reducing emissions properly, the voltage frequency increases on the downstream HO2S. Technician B says that if a fault occurs in the catalyst monitor system on three drive cycles, the MIL will be illuminated. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardTechnician A says that the catalytic converter is used only to quiet the noise of the exhaust. Technician B says that the catalytic converter is used to alter the contents of the engines exhaust. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardWhich of the following would not cause a hard-to-start problem on a PFI engine? a. A defective IAC valve b. A defective oxygen sensor c. A leaking fuel pressure regulator d. Dirty injectorsarrow_forward
- When should the ATF level be checked on most vehicles? a. When the engine is cool b. When the engine is at operating temperature and the engine is off c. When the engine is at operating temperature and the engine is on d. It does not matterarrow_forwardTrue or False? On some engines, if the gap between the crankshaft sensor and its trigger wheel is outside specifications, the sensor should be replaced.arrow_forwardWhile discussing electric exhaust gas recirculation (EEGR) systems: Technician A says that some are air cooled. Technician B says that some are cooled by engine coolant. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
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