Deck 10: Strategies of On-Board Diagnostic Non-Continuous Monitors

Question 1

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?

A) A only
B) B only
C) both A and B
D) neither A nor B

Answer 1

C

Question 2

Technician A says that the EGR system controls and monitors fuel vapors during the refueling process. Technician B says that the EVAP system controls fuel vapor loss during the refueling process as part of the ORVR system. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Answer 2

B

Question 3

The EGR monitor is an intrusive test, and the customer may notice an rpm fluctuation while the test is taking place.

Answer 3

True

Question 4

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?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 5

The enhanced evaporative emissions system must be capable of detecting a leak as small as 0.020 inch (0.5 mm).

Question 6

A two-trip DTC will be stored in the PCM memory when a fault is detected during a subsequent second trip, and the MIL will begin flashing.

Question 7

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

Question 8

The PCM continuously tests the electrical integrity of the system and monitors the EGR flow rate twice per trip.

Question 9

A vehicle is brought in for repair with the complaint of poor fuel economy. A diagnostic scan tool is attached to the DLC with the vehicle at operating temperature, and the technician determines that the pre-catalyst oxygen sensor voltage is biased high and the injector pulse width is long, and both STFT and LTFT are high. All of the following conditions could cause this EXCEPT:

A) high fuel pressure
B) open coolant temperature sensor circuit
C) TP sensor voltage fixed high
D) MAP sensor output indicates high load condition

Question 10

Which component is used to monitor EGR system operation on some vehicles by the EGR system readiness test?

A) EGR temperature sensor
B) mass air flow sensor
C) engine coolant temperature sensor
D) intake air temperature sensor

Question 11

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?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 12

A two-trip DTC will be stored in the PCM memory when a fault is detected during the first trip.

Question 13

The evaporative emissions system monitor will not run if Oxygen Sensor Monitor Failed.

Question 14

The enhanced system must be capable of detecting a leak as small as 0.060 inch (1.5 mm).

Question 15

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

A) sensor light off temperature
B) sensor degradation
C) sensor switch rate
D) sensor response time

Question 16

Technician A says that a dirty air filter can affect short-term fuel trim. Technician B says that a dirty air filter can affect long-term fuel trim. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 17

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

Question 18

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 pre-catalyst oxygen sensor continually switching between 200 mV - 800 mV, while the post-catalyst oxygen sensor's output voltage stays relatively steady at 700 mV. Technician A says that the post-catalyst oxygen sensor is fixed rich and should be replaced. Technician B says that the oxygen sensor readings are both normal. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Question 19

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

Question 20

An evaporative emissions system large leak or no purge flow could be caused by all of the following EXCEPT:

A) a loose or missing crankcase oil filler cap
B) a vapor management valve failed closed
C) a canister vent failed in the open position
D) a loose or missing fuel tank filler cap

Question 21

Which converters must be monitored by the PCM if a V design engine is equipped with two primary (manifold) catalytic converters and one secondary (downstream) catalytic converter?

Question 22

Which sensor does the PCM use to monitor catalyst efficiency?

Question 23

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

Question 24

What is indicated to the PCM if the post-oxygen sensor switches from rich to lean frequently?

Question 25

Explain the purpose of the catalyst efficiency monitor.

Question 26

The evaporative emission system is designed to reduce which pollutant?

Question 27

What could cause the post-oxygen sensor output voltage to be excessively high?

Question 28

When is the optimum time for the maximum EGR system flow rate?

Question 29

Explain the function of the heated oxygen sensor monitor.

Question 30

Explain the function of the secondary air injection system monitor.

Question 31

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

Question 32

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

Question 33

Explain the function of the evaporative emissions system monitor.

Question 34

Which monitor is used to detect malfunctions that will affect engine coolant temperature and prevent the engine from reaching normal operating temperature?

Question 35

Explain the function of the exhaust gas recirculation system monitor.

Question 36

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

Question 37

What sensor is primarily responsible for input information used to monitor the integrity of the catalyst?

Question 38

What does OBD II call the specific conditions that must be met before each monitor will run?

Question 39

Which sensor does the EGR System Readiness Test use to monitor for EGR system operation and flow?

Question 40

What are the two distinct tests that the heated oxygen sensor monitor performs?