Advanced Automotive System 1 Final Review Questions

When replacing a timing belt, many experts and vehicle manufacturers recommend that what other part(s) should be replaced?

Water pump, Tensioner assembly, camshaft oil seals(s), All of the above.

The use of variable valve timing allows the elimination of the _______ on some engines.

EGR valve

Coolant drained from the cooling system when replacing a thermostat or water pump should be ________.

Disposed of properly or recycled

A voltmeter should be connected to the circuit being tested _______.

In parallel

Inductive ammeters work because of what principle?

A magnetic field surrounds any wire carrying a current.

A reading of 432 shows on the face of the meter set to millivolt scale. The reading means ____________.

0.432 volt

A throttle position sensor waveform is going to be observed. At what setting should the volts per division be set to see the entire waveform from 0 volts to 5 volts?

1.0 V/Div

OBD-II has been on all passenger cars in the United States since ________.

1996

Setting the time base to 50 ms per division will allow the technician to view a waveform how long in duration? 50 ms 200 ms 400 ms 500 ms

500ms

A high-speed CAN BUS communicates with a scan tool through which terminal(s)?

6 and 14

One horsepower is how many watts?

746 watts

With the scope set as shown, the maximum voltage to be measured is _____ and the time displayed will be _______.

8 volts; 500ms

If a digital meter face shows 0.93 when set to read kohms, the reading means

930 ohms

When should a wet compression test be performed?

After a cylinder fails a dry compression test

Before removing a timing belt what should the technician do?

Align the timing marks

The ignition module has direct control over the firing of the coil(s) of an EI system. Which component(s) triggers (controls) the module?

All of the above

What is global (generic) OBD-II

All of the above

A meter used to measure amperes is called a (an) ___________.

Ammeter

Tech A says that it is a good idea to perform a test drive before attempting repairs. Tech B says that its a good idea to let the customer accompany the technician on the test drive. Which tech is correct?

Both techs

Tech A says that module communications networks are used to reduce the numbers of wires in a vehicle. Tech B says that a communications network is used to share data from sensors. which can be used by many different modules. Who is right?

Both techs

Tech A says that the first step in the diagnosis process is to verify the problem (concern). Tech B says the second step is to perform a thorough visual inspection.

Both techs

Tech A says to use high-voltage linesman's gloves when servicing the high voltage system on hybrid electric vehicles. Tech B says to remove the ignition key before service. Which tech is correct?

Both techs

Two techs are discussing distributor ignition Tech A says that the pickup coil or optical sensor in the distributor is used to pulse the ignition module (igniter). Tech B says that some distributor ignition systems use an optical sensor. Which tech is correct?

Both techs

Which statement below is true?

Coil-on-plug systems use one ignition coil per cylinder

What factor causes intake manifold gaskets on a V-type engine to fail?

Coolant damage, fretting, relative movement between the intake manifold and the cylinder head, All of the above

What should happen if the meter leads were connected to the positive and negative terminals of the battery while the meter and leads were set to read amperes?

Could blow an internal fuse or damage the meter

Variable valve timing can be found on which type of engine

DOHC, Cam-in-block, SOHC, All of the above

Which of the following could result in low engine compression?

Damaged piston or piston ring, Cylinder head gasket, damaged valve, All of theses are correct

What does black exhaust smoke indicate?

Excessive fuel

To reduce oxides of nitrogen (NOx) exhaust emissions, which camshaft is varied?

Exhaust camshaft only

What is the proper tool used to measure valve clearances?

Feeler gauge

DTC P0302 is a ____.

Generic DTC

An oscilloscope display is called a ________.

Graticule

At what speed does the camshaft rotate?

Half crankshaft speed

Cycles per second are expressed in __________.

Hertz

Some of the wiring under the hood of a late model vehicle is encased in bright orange covering. This indicates a _______________.

High voltage electrical system

Which type of DMM can measure current when clamped around a conductor?

Inductive

To prevent blowing the meter fuse in a DMM ________.

Install a fuse in line with the meter leads and never test resistance of an energized circuit.

Which statement below is true?

Most ignition systems work by switching the circuit grounding the ignition coil's primary windings.

A meter is set to read DC volts on the 4-volt scale. The meter leads are connected at a 12-volt battery. The display will read __________.

OL

Most variable camshaft systems use __________to control camshaft position?

Oil pressure

An ohmmeter should be connected to the circuit or component being tested ____________.

Only when no power is flowing (electrically open circuit), and in parallel

A defective thermostat can cause the PCM to set what DTC?

P0128

Abnormal combustion ( also called detonation or spark knock) increases both the temperature and __________ inside the combustion chamber

Pressure

Current ramping measures the ___________ of the ignition coils.

Primary current

Variable valve timing is used to __________.

Reduce exhaust emissions and Increase engine performance

Hybrid electric vehicles usually require special engine oil of what viscosity?

SAE 0W20

A cylinder contribution test is performed using a __________.

Scan tool

The primary (low-voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is NOT in the primary ignition circuit?

Spark plug wires

A thermostat can fail in which way?

Stuck closed, stuck partially open, stuck open, Any of the above

Tech A says that low battery voltage can cause driveability problems. Tech B says that the charging voltage should be over 15 volts when the engine is idling. Which tech is correct?

Tech A

Tech A says that active fuel management is only used on large V8s. Tech B says that active fuel management increases fuel economy. Which tech is correct?

Tech B

Tech A says that by looking at the mode $06 data, the technician can determine how close a component or system came to passing the onboard test. Tech B says that the data shown may have to be converted to obtain values that are meaningful to the technician. Which tech is correct?

Tech B

Tech A says that the water floats to the top of fuel in the tank. Tech B says that water is more likely to be drawn into the system when the fuel level is low. Which tech is correct?

Tech B

Tech A uses a steel gasket scraper on aluminum engine parts. Tech B uses a plastic or wood scraper on aluminum engine parts. Which tech is correct>

Tech B

Which item is NOT important to know before starting the diagnosis of an engine performance problem?

The brand of the engine oil used

A replacement plastic intake manifold may have a different design or appearance from the original factory-installed part. True or False

True

Which statement below is true?

Turning off the low-voltage primary coil induces a high voltage in the secondary winding.

What is the first step in diagnosing variable camshaft timing systems?

Verify the customer concern

On some engines equipped with a timing belt, the belt also may drive the __________.

Water pump

What does blue exhaust smoke indicate?

burning oil