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

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

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

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?

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

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

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

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

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

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

Which sensor does the PCM use to monitor catalyst efficiency?

Explain the function of the secondary air injection system monitor.

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

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

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

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

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

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?

Explain the function of the heated oxygen sensor monitor.

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

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: