Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 24, Problem 2ASRQ
While discussing OBD II systems: Technician A says that the PCM illuminates the MIL if a defect causes emission levels to exceed 2.5 times the emission standards for that model year vehicle. Technician B says that if a misfire condition threatens engine or catalyst damage, the PCM flashes the MIL. Who is correct?
- Technician A
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Students have asked these similar questions
Which of the following statements regarding the “Pre-Emission Inspection Check” Of a diesel powered vehicle that is subject to Opacity (Smoke Meter) testing is not true?
The governor (if equipped), the exhaust system, and the emissions control devices must all be checked.
The exhaust system must be checked for any missing sections which would prevent collection of a valid exhaust sample.
Vehicles not meeting requirements cannot be inspected. This is not considered an inspection or rejection and no fee is to be charged.
The governor, if originally equipped, must be checked for presence, connection, and operation.
The Diesel Emissions Opacity Inspection Procedure includes a visual check of the OEM (Original Equipment Manufacturer) emissions control devices for presence and connection. The Certified Inspector must reject the vehicle if any are missing, disconnected, or disabled (tampered). True or False?
While discussing the MIL on OBD II systems:
Technician A says that the MIL will flash if the
PCM detects a fault that would damage the
catalytic converter. Technician B says that
whenever the PCM has detected a fault, it will
turn on the MIL. Who is correct?
a. Technician A
• Technician B
• Both A and B
• Neither A nor B
Chapter 24 Solutions
Automotive Technology
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
- Which of the following statements about vehicles that are subject to Diesel Opacity Emissions (Smoke Meter) Inspection is NOT true? Only diesel powered vehicles with a Gross Vehicle Weight Rating (GVWR) over 8,500 pounds, per New York State Department of Environmental Conservation (DEC) regulations. “DEMA” will appear on a vehicle's New York State registration to indicate that the vehicle is subject to an opacity smokemeter test (in addition to the safety inspection). The “DEMA” (Diesel Emissions Metropolitan Area) Counties include Suffolk, Nassau, Queens, Kings, Richmond, New York, Bronx, Westchester & Albany. Only diesel powerearrow_forwardWhich of the following statements is not true? a. DTCs that will not affect emissions will never illuminate the MIL. b. An active or current DTC represents a fault that was detected and occurred during two trips. c. When a two-trip fault is detected for the second time, a DTC is stored as a pending code. d. There are some DTCs that will set in one triparrow_forwardHow does regular maintenance contribute to the overall lifespan of a vehicle's engine?arrow_forward
- How can ambient temperature and pressure affect vehicle emission rates?arrow_forwardWhile discussing evaporative (EVAP) systems: Technician A says that the coolant temperature has to be above a preset value before the PCM will operate the canister purge solenoid. Technician B says that the vehicle speed has to be above a preset value before the PCM will operate the canister purge solenoid. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardWhile checking the condition of a cars ATF: Technician A says that if the fluid has a dark brownish or blackish color and/or a burned odor, the fluid has been overheated. Technician B says that if the fluid has a milky color, this indicates that engine coolant has been leaking into the transrnissions cooler. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
- While discussing automotive emissions: Technician A says that oxygen emissions are monitored because they are an indication of the completeness of the combustion process. Technician B says that the conditions for minimizing HC emissions are the same as those that cause high NOx emissions. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardThe CV joint boots on the left side of a vehicle appear to be squeezed together; the boots on the right side of the vehicle appear to be stretched apart. Technician A says that one or more of the engine/transaxle's mounts may be broken. Technician B says that one or more of the engine/transaxle's subframe mounts may be broken. Who is correct? O a. A only O b.B only C. Both A and B O d. Neither A nor Barrow_forwardWhile 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_forward
- While discussing the proper way to test a catalytic converter: Technician A says that a pressure gauge can be inserted into the oxygen sensor bore and the backpressure caused by the converter measured. Technician B says that restrictions in the converter can be checked with a vacuum gauge while the engine is being quickly accelerated. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardWhen 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_forwardBefore replacing any exhaust system component: Technician A soaks all old connections with penetrating oil. Technician B checks the old systems routing for critical clearance points. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
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