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Engine Performance 1
Engine Performance 1
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Questions
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Answers
1
Special adapters are needed to use a scan tool on OBD-I vehicles but the port for OBD-II vehicles is standardized.
False
True
2
What kind of ignition system is illustrated?
Waste Spark
Coil on Plug
Distributorless
Distributor
3
All of the following are part of the diagnostic process EXCEPT:
Perform a visual inspection
Road test the vehicle
Re-flash the PCM
Verify the complaint
4
Which of the following is the first noticeable symptom of a restricted air filter?
A no-start condition
Loss of power
Excessive oil consumption
Decrease in fuel economy
5
A soft code in the PCM memory is a code that:
Idicates a top priority code
Exists at the time the vehicle is being tested
Can be found if a diagnostic flow chart is used
Occurred in the past but no longer exists
6
An air filter problem will have no effect on fuel consumption.
True
False
7
Nylon fuel lines should be inspected for all of the following EXCEPT:
Discoloration
Cracks
Kinks
Loose fitting
8
What would happen if one ignition coil in this system were to fail?
Misfire on one cylinder only
Two cylinders would be affected
The vehicle would not start
Nothing the others would compensate
9
Refer to the illustration. All of the following conditions could reduce engine power during a boost condition EXCEPT:
Damaged compressor fins
Wastegate valve stuck open
A blown gauge fuse
A leak between the turbocharger and the exhaust manifold
10
When an emissions related fault is detected all of the following will occur EXCEPT:
None of the above
The malfuntion indicator light (MIL) will illuminate
Freeze frame data will be stored
The ECM will advance spark timing to compensate
11
All of the following are components of the primary (low voltage) circuit EXCEPT:
Spark plug wire
Ignition switch
Battery
Ignition coil
12
It is standard practice to run the monitor for the repaired system before returning the vehicle to the customer.
True
False
13
It is standard practice on late model vehicles to remove the negative battery cable for five seconds to clear DTCs.
False
True
14
Tech A says the first step in diagnosis is to verify the complaint. B says one of the first steps is a visual inspection
B only
A only
Neither A nor B
Both A and B
15
A clogged fuel filter may affect volume of fuel output while not necessarily affecting the fuel pressure.
False
True
16
High system voltage will increase fuel injector on time (pulse width).
True
False
17
A vehicle with the ignition system illustrated has a no-spark condition on cylinders #1 and #5. What could be the cause?
Fouled sparkplug on cylinder one
PCM failure
A bad coil driver
A faulty crankshaft sensor
18
What is the purpose of secondary air injection?
To cool down the exhaust gasses
To further oxidize hydrocarbon and carbon monoxide emissions in the exhaust
To trick the O2 sensor into thinking that the emissions are within spec
To lean out the air fuel mixture
19
In order for readiness monitors to run the system that is being monitored must not have any related DTCs stored
False
True
20
What might cause a misfire on only one cylinder?
An open spark plug wire
High fuel pump pressure
Both A and B
Neither A nor B
21
All vehicles require a functional camshaft position sensor to start.
False
True
22
All of the following could cause a multiple-cylinder misfire code EXCEPT:
Low fuel pressure
R*tarded valve timing
A leaking EGR valve
A burnt valve
23
What could cause the following readings: Bank 1 long-term fuel trim: -18, bank 2 LTFT: -19?
A restricted fuel return line
Neither A nor B
A defective fuel pressure regulator
Both A and B
24
Cranking the engine with the throttle fully depressed will result in the vehicle starting in what mode of operation?
Clear flood
Acceleration
Run
Starting
25
Techn A says freeze frame data is always set for a misfire code. Tech B says a misfire code is a high-priority code.
Neither A nor B
Both A and B
Tech B
Tech A
26
On some vehicles the PCM controls ignition timing at all times.
True
False
27
The ignition module controls the timing at startup on some vehicles.
False
True
28
A cylinder-power balance test on a distributor-ignition vehicle can indicate all of the following problems EXCEPT:
Blown head gasket
Burnt valve
Weak ignition coil
Cracked piston
29
How can you check thermostat operation?
Visually by running the vehicle from cold to hot and watching its operation
By letting the car run for five minutes and then removing the radiator cap
With a scan tool and a thermometer
By feeling the hoses to see if they're hot
30
Tech A says a digital voltmeter CANNOT be used to check a O2sensor. B says a test light CAN be used to check an O2sensor
Both A and B
Tech B
Neither A nor B
Tech A
31
What causes the MIL (malfunction indicator light) to illuminate?
Low tire pressure
Low oil pressure
Emissions faults
High coolant temperatures
32
A restricted exhaust can cause all of the following EXCEPT:
None of the above
Unusual noises
Reduced fuel economy
Reduced engine efficiency
33
All of the following are possible causes of turbocharger failure EXCEPT:
Poor engine cooling system maintenance
Poor intake filtration
Poor exhaust system maintenance
Poor engine oil maintenance
34
What will the PCM do if there is no oxygen detected in the exhaust?
Put the vehicle in limp-in mode
Decrease injector pulse width
Increase injector pulse width
None of the above
35
What could cause a single cylinder misfire DTC?
A bad ignition coil
Low fuel pump pressure
A thermostat that's stuck closed
Low battery voltage
36
A stuck open fuel pressure regulator would cause high fuel pressure readings.
False
True
37
Which of the following is the LEAST LIKELY cause of a fuel tank leak?
Leaking tank seams
Faulty retaining straps
Road damage
Rust
38
All of the following could cause premature turbo bearing failure EXCEPT
Restricted oil passages to the turbo
Oil contamination from infrequent oil changes
Low oil pressure
Oil contamination from turbo boost buildup in the engine
39
The cause of a MIL not illuminating during check when the ignition is turned on can be all of the following EXCEPT:
A blown bulb
An open MIL circuit
A DTC stored within the PCM
An internal circuit problem with the PCM
40
The ignition control module uses a digital signal from the PCM (powertrain control module) for what purpose?
Synchronization Signal
Timing Control
Cylinder ID
RPM signal
41
A vehicle has a DTC for an open vehicle speed sensor circuit. Which of the following would most likely be affected?
Traction control system
Manual transmission shift points
Air conditioning (A/C) system
Cruise control system
42
A scan tool can be used to look TPS DTCs but you will need an oscilloscope to verify TPS input.
True
False
43
A damaged or missing air filter can increase wear on cylinder walls.
True
False
44
Tech A says a stethoscope can be used to pinpoint engine noises. Tech B says a long screwdriver can be used for this.
Both A and B
A only
Neither A nor B
B only
45
The secondary circuit of the ignition system produces...
Dangerously high amperage
High voltage in the thousands of volts
Only enough voltage to jump the spark gap
Low voltage
46
A DTC will tell you all of the following information EXCEPT:
None of the above
Which system is affected
Which circuit is affected
Which component is malfunctioning
47
A SFI vehicle stalls intermitently at idle and shows a negative LTFT value All of the following could cause this EXCEPT:
A leaking fuel pressure regulator diaphragm
Leaking fuel injectors
A fuel pressure regulator stuck closed
A vacuum leak
48
A short-term fuel trim of 0 percent and a long-term fuel trim of +19 percent means what?
The engine is running lean at the present time
The engine has a history of running lean
The engine has a history of running rich
The engine is running rich at the present time
49
If a lean condition is detected what will happen to the short-term fuel trim?
The STFT will not be affected but the LTFT will show a positive value
The STFT will not be affected but the LTFT will show negative value
The STFT will show a positive value
The STFT will show a negative value
50
Which of the following computer sensor signals is not used during open-loop mode?
Heated O2 sensor
Manifold absolute pressure (MAP) sensor
Throttle position sensor (TPS)
Engine coolant temperature sensor
51
How does a wastegate on a turbocharged engine control boost pressure?
It closes to allow exhaust gasses to bypass the turbine
It blocks all exhaust gasses from the turbine until boost is needed
It opens to relive excess boost pressure in the in the intake manifold
It opens to allow an ammount exhaust gasses to bypass the turbine
52
When completing monitor readiness, the vehicle must be driven under specific conditions in order for the monitors to run
True
False
53
Coolant temperature input is used to determine open and closed loop status.
False
True
54
Which of the follow diagnostic trouble codes are Type A codes and should be troubleshot first?
Vehicle speed control
Transmission
Non-emissions related
Misfire control
55
Which of these could be a cause of rough idle?
An open in the neutral safety switch circuit
A defective downstream oxygen sensor
Thermostat that is stuck open
Gum and carbon build up in the intake manifold
56
An evaporative system DTC may be set by all of the following EXCEPT:
A cracked vacuum hose
A loose gas cap
A leaking fuel injector
An open purge control solenoid
57
Throttle body cleaner can be used on all makes and models.
False
True
58
All of the following are inputs for electronic timing control EXCEPT:
Throttle position sensor (TPS)
Knock sensor
Oxygen sensor
Engine coolant temperature sensor
59
An ammeter is used on the ignition primary circuit to check what?
Current Draw
Polarity
Voltage
Resistance
60
All of the following components are part of the fuel pump control circuit EXCEPT:
Body Control Module (BCM)
Fuel pump relay
Ignition switch
Powertrain control module (PCM)
