Chapter 20 OBD II Monitors

A particulate filter restriction has been detected. The dash (instrument panel) will illuminate ________ in addition to the MIL. A flashing blue light A "wrench" symbol A "DUST OUT" warning lamp All the instrument lighting

A "wrench" symbol

The EGR monitors are designed to measure the flow of exhaust gases through the intake manifold. The monitors will fail if ________. The exhaust gas flow is above specifications The exhaust gases are too hot The exhaust gas flow is below specification All of the above

All of the above

Which monitor is a non-continuous monitor? Boost Pressure Control Systems Monitor Particulate Matter (PM) Filter Monitor Non-methane Hydrocarbon (NMHC) Catalyst Monitor All of the above

All of the above

A continuous OBD-II monitor is being discussed. Technician A says that once enabling conditions are met, the monitor will run continuously unless a failure exists that will prevent its operation. Technician B says that the continuous monitor may not run if a condition exists that would lead to a false failure. Which technician is correct? Technician A only Technician B only Both technicians A and B Neither technician A nor B

Both technicians A and B

The operation of the diesel oxidation catalyst (DOC) monitor is being discussed. Technician A says that if the temperature at the outlet of the catalyst is not at the predicted temperature, the monitor will fail. Technician B says that if the DOC fails, the DPF regeneration may not occur. Which technician is correct? Technician A only Technician B only Both technicians A and B Neither technician A nor B

Both technicians A and B

A diesel vehicle has the MIL "ON" and a DTC P0299 (low turbocharger output) has been set. What should the technician do? Check and tighten the intake hose clamps Replace the turbocharger Install a new aftercooler Run the engine without the air filter to see if the code goes away

Check and tighten the intake hose clamps

How does the misfire monitor determine if a cylinder is not firing? Uses the MAP sensor to evaluate intake manifold pressure pulses Measures the duration of the cam with the cam sensor Watches for uneven glow plug temperatures Compares the acceleration of each firing event using the crank sensor

Compares the acceleration of each firing event using the crank sensor

The ________ monitor tests input sensors when the key is turned ON. Component Average Sensor Misfire

Component

Starting in 2007, diesel-equipped vehicles are not allowed to vent ________ to the atmosphere. Crankcase gases Water vapor Coolant vapor Gasoline fumes

Crankcase gases

________ monitors run once per vehicle drive cycle, if the enabling requirements are met. Comprehensive component Non-continuous Continuous Any of the above

Non-continuous

When will the boost pressure monitor turn ON the MIL? Only after a long coast-down cycle On the second consecutive drive cycle with a fault present At the first indication of a fault After one warm-up cycle

On the second consecutive drive cycle with a fault present

The PCM electrical test checks for all of these EXCEPT ________. Sensor values Short-to-voltage Short-to-ground Open circuits

Sensor values

The misfire monitor is being discussed. Technician A says that the monitor will not run if there is a stored code for the crankshaft sensor. Technician B says that a stored code for the crankshaft sensor will cause the monitor to run on the third drive cycle. Which technician is correct? Technician A only Technician B only Both technicians A and B Neither technician A nor B

Technician A only

The EGR monitor is designed to determine if EGR system flow is ________. Too hot or too cool High in NOx Too low or too high Opaque

Too low or too high