Exam 10: Strategies of on Board Diagnostic Non Continuous Monitors

During the diagnostic test procedure for a catalyst efficiency code, a diagnostic scan tool is connected to the DLC with the vehicle at operating temperature, and the data screen displays the precatalyst oxygen sensor continually switching between 200 mV - 800 mV, while the postcatalyst oxygen sensor's output voltage stays relatively steady at 700 mV. Technician A says that the postcatalyst oxygen sensor is fixed rich and should be replaced. Technician B says that the oxygen sensor readings are both normal. Who is correct?

Free

(Multiple Choice)

4.9/5

(36)

Question 1

Correct Answer:

Verified

In what year did the EPA introduce the positive crankcase ventilation (PCV) monitor, and what is its function?

Free

(Essay)

4.8/5

(32)

Question 2

Correct Answer:

Verified

Beginning with the 2002 model year, with full phase in required by 2004, manufacturers were required to incorporate a strategy into their OBD II monitored systems. The PCV monitoring system must be able to detect a PCV hose or connection that has become disconnected, and the system must meet all design guidelines concerning hose and valve connections as well as the material used to prevent system failures and to rapidly detect failures that may occur.

What are the non-continuous monitors that are only run once per trip?

Free

(Essay)

4.8/5

(30)

Question 3

Correct Answer:

Verified

Evaporative emissions system (EVAP) monitor, catalyst efficiency monitor, heated oxygen sensor monitor, thermostat monitor, exhaust gas recirculation system (EGR) monitor, secondary air injection system (AIR) monitor, positive crankcase ventilation (PCV) monitor

The heated oxygen sensor monitor will test all of the following EXCEPT:

(Multiple Choice)

5.0/5

(37)

Question 4

Technician A says that the EGR system monitors the ability of the fuel tank to hold pressure as well as the purge of vapors into the intake system. Technician B says that the EVAP system collects fuel vapors in the expansion cavity at the top of the fuel tank, then sends them to the charcoal canister. Who is correct?

(Multiple Choice)

4.8/5

(40)

Question 5

Explain the function of the secondary air injection system monitor.

(Essay)

4.7/5

(38)

Question 6

If a non-continuous monitor system or component fails the monitor test, what will occur?

(Essay)

4.9/5

(29)

Question 7

Technician A says the catalyst's ability to store and release oxygen is a direct indication of the catalyst's performance. Technician B says the catalyst monitor compares the signal from both the upstream and downstream oxygen sensors. Who is correct?

(Multiple Choice)

4.8/5

(28)

Question 8

Why does OBD II require oxygen sensors to be heated?

(Essay)

4.8/5

(39)

Question 9

Technician A says the heated oxygen sensor monitor performs two distinct tests; one test verifies the performance of the pre- and post-oxygen sensor heater element and circuit. Technician B says the heated oxygen sensor monitor performs two distinct tests; one test monitors the pre- and post-oxygen sensor signal switch rate and signal circuit. Who is correct?

(Multiple Choice)

4.9/5

(35)

Question 10

The EVAP charcoal canister functions as a storage container for fuel vapors.

(True/False)

4.9/5

(34)

Question 11

Technician A says the secondary air monitor tests for flow by monitoring the oxygen sensor response. Technician B says the secondary air monitor is run once per drive cycle. Who is correct?

(Multiple Choice)

4.8/5

(27)

Question 12

The thermostat monitor was integrated into OBD II systems beginning in what year?

(Essay)

4.9/5

(41)

Question 13

The evaporative emissions system monitor will not run if the oxygen sensor monitor failed.

(True/False)

4.9/5

(31)

Question 14

Downstream secondary air injection systems are only used on conventional oxidation catalyst systems.

(True/False)

4.7/5

(42)

Question 15

The evaporative emission system is designed to reduce which pollutant?

(Short Answer)

4.9/5

(32)

Question 16

What is indicated to the PCM if the post-oxygen sensor switches from rich to lean frequently (has a high precatalyst to postcatalyst ratio) ?

(Short Answer)

4.8/5

(38)

Question 17

OBD II requires that the EGR system monitor test the function of what types of components and what types of flow rate?

(Short Answer)

4.7/5

(35)

Question 18

The conventional oxidation catalyst is not capable of converting oxides of nitrogen (NO_X).

(True/False)

4.8/5

(35)

Question 19

If a fault is detected during two consecutive trips, the MIL is turned on, a DTC is set, and freeze-frame data is stored.

(True/False)

4.9/5

(30)

Question 20

Showing 1 - 20 of 40

In what year did the EPA introduce the positive crankcase ventilation (PCV) monitor, and what is its function?

What are the non-continuous monitors that are only run once per trip?

The heated oxygen sensor monitor will test all of the following EXCEPT:

Explain the function of the secondary air injection system monitor.

If a non-continuous monitor system or component fails the monitor test, what will occur?

Technician A says the catalyst's ability to store and release oxygen is a direct indication of the catalyst's performance. Technician B says the catalyst monitor compares the signal from both the upstream and downstream oxygen sensors. Who is correct?

Why does OBD II require oxygen sensors to be heated?

The EVAP charcoal canister functions as a storage container for fuel vapors.

Technician A says the secondary air monitor tests for flow by monitoring the oxygen sensor response. Technician B says the secondary air monitor is run once per drive cycle. Who is correct?

The thermostat monitor was integrated into OBD II systems beginning in what year?

The evaporative emissions system monitor will not run if the oxygen sensor monitor failed.

Downstream secondary air injection systems are only used on conventional oxidation catalyst systems.

The evaporative emission system is designed to reduce which pollutant?

What is indicated to the PCM if the post-oxygen sensor switches from rich to lean frequently (has a high precatalyst to postcatalyst ratio) ?

OBD II requires that the EGR system monitor test the function of what types of components and what types of flow rate?

The conventional oxidation catalyst is not capable of converting oxides of nitrogen (NO_X).

If a fault is detected during two consecutive trips, the MIL is turned on, a DTC is set, and freeze-frame data is stored.

Emissions and Engine Performance Overview

Basic Theories

History of on Board Diagnostics Obd

On Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Ignition System and Related Input Sensors Output Actuators Diagnosis

Fuel System and Related Input Sensors Output Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of on Board Diagnostic Continuous Monitors

I M Failure Diagnosis and Five Gas Exhaust Analysis

Filters

Exam 10: Strategies of on Board Diagnostic Non Continuous Monitors

In what year did the EPA introduce the positive crankcase ventilation (PCV) monitor, and what is its function?

What are the non-continuous monitors that are only run once per trip?

The heated oxygen sensor monitor will test all of the following EXCEPT:

Explain the function of the secondary air injection system monitor.

If a non-continuous monitor system or component fails the monitor test, what will occur?

Technician A says the catalyst's ability to store and release oxygen is a direct indication of the catalyst's performance. Technician B says the catalyst monitor compares the signal from both the upstream and downstream oxygen sensors. Who is correct?

Why does OBD II require oxygen sensors to be heated?

The EVAP charcoal canister functions as a storage container for fuel vapors.

Technician A says the secondary air monitor tests for flow by monitoring the oxygen sensor response. Technician B says the secondary air monitor is run once per drive cycle. Who is correct?

The thermostat monitor was integrated into OBD II systems beginning in what year?

The evaporative emissions system monitor will not run if the oxygen sensor monitor failed.

Downstream secondary air injection systems are only used on conventional oxidation catalyst systems.

The evaporative emission system is designed to reduce which pollutant?

What is indicated to the PCM if the post-oxygen sensor switches from rich to lean frequently (has a high precatalyst to postcatalyst ratio) ?

OBD II requires that the EGR system monitor test the function of what types of components and what types of flow rate?

The conventional oxidation catalyst is not capable of converting oxides of nitrogen (NOX).

If a fault is detected during two consecutive trips, the MIL is turned on, a DTC is set, and freeze-frame data is stored.

Emissions and Engine Performance Overview

Basic Theories

History of on Board Diagnostics Obd

On Board Diagnostic Scanners and Digital Storage Oscilloscopes

Computers and Input Sensors

Ignition System and Related Input Sensors Output Actuators Diagnosis

Fuel System and Related Input Sensors Output Actuators Diagnosis

Emission Control and Evaporative Systems

Strategies of on Board Diagnostic Continuous Monitors

I M Failure Diagnosis and Five Gas Exhaust Analysis

Filters

The conventional oxidation catalyst is not capable of converting oxides of nitrogen (NO_X).