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Ase a8 Flashcards

1
Q

When should valve adjustment be performed according to Technician A?

A

On a cold engine

Some manufacturers specify that the valves be adjusted on a hot engine.

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2
Q

What is the correct piston position for valve adjustment according to Technician B?

A

Top dead center (TDC) on the compression stroke

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3
Q

Can a stuck-open fuel pressure regulator cause fuel pressure readings above specifications?

A

No

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4
Q

What does fuel present at the vacuum port of a fuel pressure regulator indicate?

A

A ruptured diaphragm

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5
Q

What is the purpose of the positive crankcase ventilation (PCV) system?

A

To vent excess pressure formed in the crankcase from piston blow-by

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6
Q

Does a rattling PCV valve confirm that the PCV system is working?

A

No

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7
Q

What can greenish corrosion on terminals cause in a circuit?

A

High resistance

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8
Q

What can loose retaining lock tabs on a terminal cause?

A

High resistance in connector terminals

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9
Q

What is the allowable reading for a key-off current draw test?

A

Less than .05 amps

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10
Q

Can a single-cylinder misfire diagnostic trouble code (DTC) be caused by a low fuel pump pressure?

A

No

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11
Q

What can a restricted fuel filter affect?

A

The amount (volume) of fuel that can be pumped

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12
Q

Which of the following can cause spark knock?

A

A stuck-closed EGR valve

A stuck-open EGR valve would not cause spark knock.

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13
Q

What is necessary when replacing the powertrain control module (PCM)?

A

It may have to be reprogrammed

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14
Q

What is one of the first steps in diagnosing a drivability complaint?

A

Verify the driver’s complaint

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15
Q

What should the normal secondary-circuit resistance of an ignition coil be?

A

9,000 to 30,000 ohms

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16
Q

What does air loss from the oil filler cap indicate during a cylinder leakage test?

A

Worn piston rings

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17
Q

Can a faulty camshaft position sensor cause a no-start condition?

A

Yes, but some vehicles may start without it

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18
Q

What is the maximum allowable back pressure in the exhaust at idle?

A

1.5 psi

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19
Q

Can a leaking gas cap gasket cause an evaporative emissions failure?

A

Yes

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20
Q

What should be used to check for exhaust restrictions?

A

A vacuum gauge

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21
Q

True or False: A secondary air injection system has no effect on carbon dioxide readings.

A

True

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22
Q

What is the purpose of the evaporative emissions system?

A

To prevent the release of gasoline vapors into the atmosphere

A leaking 315 cap will cause the malfunctioning indicator lamp to illuminate on a vehicle with an enhanced EVAP system.

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23
Q

What does a diagnostic trouble code (DTC) indicate?

A

A system or circuit is out of its parameters

A DTC is set when a fault exists that affects emissions, illuminating the malfunction indicator lamp (MIL).

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24
Q

What color smoke indicates oil being burned in the combustion chamber?

A

Blue to gray

White smoke indicates coolant in the exhaust.

25
Which component is NOT part of the primary ignition circuit?
Spark plug wire ## Footnote The spark plug wire is a secondary ignition component; primary components handle low voltage.
26
What happens to fuel pressure as vacuum is applied to the fuel pressure regulator?
Fuel pressure should decrease ## Footnote The fuel pressure regulator controls fuel pressure and is affected by vacuum changes.
27
What is the flow of a PCV valve at idle speeds?
Low ## Footnote The PCV valve restricts airflow at high manifold vacuum conditions.
28
What does the DTC PO300 indicate?
Random/Multiple-Cylinder Misfire Detected ## Footnote A cylinder miss can damage the catalytic converter and cause the MIL to flash.
29
What is the most likely cause of ignition coil failure?
Prolonged open circuit in the secondary ## Footnote An open in the secondary circuit can cause internal tracking, leading to premature coil failure.
30
What does a fuel pressure test confirm?
Proper operation of the fuel pump and regulator ## Footnote It does not confirm adequate volume or injector operation.
31
What is the function of the EGR system?
To lower combustion chamber temperature ## Footnote This helps reduce NOx emissions.
32
What does a negative long-term fuel trim value indicate?
The PCM is subtracting fuel, leaning the air/fuel mixture ## Footnote It could be caused by a defective fuel pressure regulator or a restricted fuel return line.
33
What tool can be used to pinpoint engine noises?
Stethoscope or long screwdriver ## Footnote Both tools can help diagnose engine noise; a screwdriver is a substitute if a stethoscope is unavailable.
34
Which of the following is NOT a task performed by engine oil?
Helps cool the charging system ## Footnote Engine oil helps cool the engine and lubricates various components but is not involved in the electrical charging system.
35
What is the purpose of the rev limiter in an engine?
To protect the engine from over revving ## Footnote Rev limiters are set at different RPMs depending on manufacturers.
36
What does an anti-backfire valve do?
Prevents backfiring during deceleration ## Footnote It is used in pump-driven air-injection systems.
37
What could cause a hesitation during acceleration in a MAF load-calculating-type engine?
Restricted MAF inlet screen or bad throttle position sensor signal ## Footnote Both issues can lead to improper responses and hesitation under acceleration.
38
What is NOT a cause of a noisy valve train?
High oil pressure ## Footnote Low oil pressure can cause valve train noise, while high pressure would not.
39
What does a cylinder misfire NOT cause?
High carbon dioxide (CO2) readings ## Footnote A missing engine would have a low CO2 reading as it indicates engine efficiency.
40
What could cause a DTC PO134 (Oxygen Sensor Circuit, No Activity Detected)?
High fuel system pressure or a problem with the downstream O2 sensor ## Footnote Low fuel pressure would affect all sensor readings, not just one.
41
What DTC code indicates an Oxygen Sensor Circuit issue with no activity detected?
PO134 ## Footnote This code refers to bank #1, sensor #1.
42
Who is correct regarding the potential causes of a PO134 DTC?
D. Neither A nor B ## Footnote Both technicians are incorrect; high fuel pressure affects all sensors, and bank #1, sensor #1 is upstream.
43
What is the consequence of an EGR valve stuck closed?
High NOx emissions ## Footnote An EGR valve helps reduce NOx by lowering combustion temperatures.
44
Who is correct about the effects of an EGR valve stuck closed?
C. Both A and B ## Footnote Both technicians are correct; it can cause detonation and high NOx emissions.
45
What is the maximum allowable resistance in the power side of the power distribution circuit?
200 ohms ## Footnote Any measurable resistance is not allowable in this circuit.
46
How can excessive resistance in the power side of the power distribution circuit be tested?
Voltage-drop test ## Footnote A voltage drop over 0.5 volts indicates excessive resistance.
47
What is the likely cause if the vacuum gauge reading drops slowly when the engine is accelerated?
A restricted exhaust ## Footnote This can be diagnosed by observing the vacuum gauge while increasing RPM.
48
What DTC code indicates a cylinder misfire in cylinder #4?
PO304 ## Footnote This code can be caused by issues like an open spark plug wire.
49
Who is correct regarding the causes of a DTC for cylinder #4 misfire?
B. B only ## Footnote Only Technician B is correct; high fuel pressure affects all cylinders.
50
What is the least likely cause of a fuel tank leak?
C. Retaining straps ## Footnote Rust, road damage, and leaking seams are more common causes.
51
What does the three-way catalytic converter (TWC) do?
Reduces harmful emissions ## Footnote It converts carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful gases.
52
Who is correct about the operation of the air pump in the secondary injection system?
C. Both A and B ## Footnote The air pump pumps air into the exhaust manifold when in open loop and into the catalytic converter in closed loop.
53
What type of hose must be used when replacing fuel lines on a fuel-injected vehicle?
Special fuel injection hose ## Footnote Regular fuel hose cannot withstand the higher pressures of fuel injection systems.
54
Who is correct about oil found inside the air filter housing?
C. Both A and B ## Footnote Both technicians are correct; excessive crankcase pressure can lead to oil in the air cleaner.
55
Which condition can set a DTC for an intake air temperature sensor?
An out-of-range sensor input ## Footnote Other conditions like an open or short in the voltage reference wire can also trigger a DTC.
56
Which system would most likely be affected by an open vehicle speed sensor circuit?
D. Cruise control system ## Footnote The cruise control system relies on the vehicle speed sensor for operation.
57
What is the importance of electrolyte level in a non-serviceable battery?
Critical for battery performance ## Footnote The electrolyte level can sometimes be checked in a translucent battery case.
58
What term describes the condition when the air/fuel mixture ignites before the spark plug fires?
Pre-ignition ## Footnote This occurs due to a hot spot in the combustion chamber.

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