Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 21, Problem 4ASRQ
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
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A digital speedometer constantly reads 0 mph : TechnicianA says that the problem may be the vehiclespeed sensor. Technician B says that the problem maybe the throttle position sensor. Who is correct?a. Technician Ab. Technician Bc. Both A and Bd. Neither A nor B
A vehicle with a direct TPMS just had all 4 tires replaced, yet the TPMS warning light is on. Technician A says this may be due to the tire tech damaging one of the sensors during tire replacement. Technician B says it may be caused by the tire tech damaging the wheel speed sensor during tire install. Who is correct?
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A vehicle with a direct TPMS system keeps showing “Low-Left Front Tire,” but when checked, the tire is within specification. Which of the following would be the most likely cause?
A broken reluctor wheel
Multiple TPMS sensors have failed
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A faulty wheel speed sensor
Chapter 21 Solutions
Automotive Technology
Ch. 21 - What is the purpose of an IVR?Ch. 21 - Explain how an air-core gauge works.Ch. 21 - What are two ways to provide input for the...Ch. 21 - Describe the two types of instrument panel...Ch. 21 - What is the device found in some fuel tanks to...Ch. 21 - What is the correct way to check a coolant...Ch. 21 - What type of sending unit is typically used to...Ch. 21 - What is the major difference between an indicator...Ch. 21 - True or False? A driver information center...Ch. 21 - True or False? The ABS lamp turns on whenever the...
Ch. 21 - The indicator needle on a speedometer is held to...Ch. 21 - Which of the following uses a permanent magnet and...Ch. 21 - What type of memory is used to store the...Ch. 21 - Which of the following is not a true statement...Ch. 21 - Which of the following statements about oil gauge...Ch. 21 - While discussing what the maintenance reminders...Ch. 21 - None of the engines gauges works: Technician A...Ch. 21 - The oil pressure light stays on whenever the...Ch. 21 - A digital speedometer constantly reads 0 mph:...Ch. 21 - All gauges operate but read lower than normal:...Ch. 21 - When testing an engine temperature sensor:...Ch. 21 - The coolant temperature gauge stays low (cold)...Ch. 21 - While discussing the instrumentation on a Toyota...Ch. 21 - The TPM warning lamp is lit: Technician A says...Ch. 21 - The yellow electronic throttle control warning...
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- While diagnosing a cruise control system that does not turn on: Technician A checks the vehicle speed sensor and its input to the control module. Technician B checks the operation of the brake lights. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardTechnician A says that wheel-speed sensors send an AC voltage signal to the control module. Technician B says that wheel speed signals create an AC signal voltage by altering a reference voltage received from the control module. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forwardWhen 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 wave. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- Technician A says that each ABS has its own diagnostic procedure involving use of the brake and antilock warning lamps, special testers, breakout boxes, scan tools, troubleshooting charts, and wiring diagrams. Technician B says that ABSs vary in the number of codes they can store and whether they will retain the code in memory when the ignition is turned off. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forwardA TPMS sensor re-learn procedure is being discussed. Technician A says you must always use a scan tool to initiate the re-learn process. Technician B says letting air out of the tires will initiate the re-learn procedure. Who is correct? Technician A Technician B Both Technician A and B Neither Technician A or Barrow_forwardVehicle dynamics during braking are being discussed: Technician A says that the rear of the car rises during braking. Technician B says that the front of the car lowers during braking. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forward
- What are two ways to provide input for the speedometer?arrow_forwardWhich of the following is not a voltage-generating type sensor? vehicle speed sensor OSS MAP ISSarrow_forward104) Which of the following inputs is NOT a driver commanded input? Brake pedal switch Mass airflow sensor Throttle position sensor Transmission range sensorarrow_forward
- Which 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_forwardTechnician 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_forwardThe yellow electronic throttle control warning lamp comes on occasionally while the vehicle is driven; Technician A says that this means there is a problem with the system. Technician B says that the system is actively regulating drive torque and engine power when the lamp is lit Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
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