Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 25, Problem 8ASRQ
When testing a frequency varying MAF: Technician A says that the frequency should increase with an increase in engine speed. Technician B says that when observed on a lab scope, the signal from the sensor should be a square w’ave. Who is correct?
- Technician A
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Chapter 25 Solutions
Automotive Technology
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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- A digital speedometer constantly reads 0 mph: Technician A says that the problem may be the vehicle speed sensor. Technician B says that the problem may be the throttle position sensor. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardWhen testing an engine temperature sensor: Technician A uses an ohmmeter to test the thermistor. Technician B says that the thermistor reacts to pressure and applies air pressure to the backside of the sensor. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardWhile discussing Hall-effect vehicle speed sensor tests: Technician A says to use an ohmmeter to test the resistance of the coil. Technician B says that the voltage generated by the sensor can be measured by connecting a voltmeter across the sensors terminals. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- True or False? An A/F ratio sensor can be tested in the same way as an oxygen sensor.arrow_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_forwardWhich of the following is the most likely cause of a lean condition during acceleration and cruising speeds? a. A defective oxygen sensor b. A defective PCM c. A defective ECT sensor d. A defective MAF sensorarrow_forward
- Technician A says that a faulty MAF sensor can cause the engine to run lean. Technician B says that a faulty MAP sensor can cause the engine to not start. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardA defective LAT sensor or circuit may cause the fol lowing problems, except. hard engine starting rich or lean air-fuel ratio improper converter clutch lockup reduced fuel economyarrow_forwardTechnician A says that a faulty TP sensor can cause delayed shifts. Technician B says that delayed shifts can be caused by an open shift solenoid. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
- A transmission has delayed upshifts under all operating conditions: Technician A says that low mainline pressure can cause this. Technician B says that a faulty TFT sensor can cause this. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardWhich of the following is a likely cause of a lean condition during acceleration and cruising speeds? a. A defective oxygen sensor b. A defective PCM c. A defective ECT sensor d. A defective MAF sensorarrow_forwardA TPMS sensor is being replaced. Technician A says that if you replace it with a manufacturer specific TPMS, you need to program the sensor before install. Technician B says that all manufacture specific TPMS sensors use a 315 MHz radio frequency. Who is correct? Technician A Technician B Both Technician A and B Neither Technician A or Barrow_forward
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