The sensor that most determines fuel delivery when a fuel injected engine is first started is the ________.
A) O2S B) ECT sensor C) IAT sensor D) Engine MAP sensor
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Technician A states that disconnecting the battery is the best way to erase stored OBD-II DTCs. Technician B states that disconnecting the battery may not erase stored freeze frame information or DTCs. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
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Technician A says that in bypass mode, the ignition system is timed by the ignition module. Technician B says that in bypass mode, the ignition system does not use the PCM to time spark plug firing. Which technician is correct?
A) Technician A B) Technician B C) Both technicians D) Neither technician
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Technician A says that the paper test could detect a burned valve. Technician B says that a grayish white stain on the engine could be a coolant leak. Who is right?
A) Technician A B) Technician B C) Both technicians D) Neither technician
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Active fuel management on GM vehicles was initially called ________.
A) Variable cylinder operation
B) Displacement on Demand
C) Fuel economy enhancement
D) None of these
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Hearing protection should be worn any time the noise level exceeds ________.
A) 60 dB B) 90 dB C) 80 dB D) 70 dB
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A drive shaft can be checked for proper balance by marking the circumference of the shaft in four places and running the vehicle drive wheels to spot the point of imbalance using a(n) ________.
A) Reed tachometer B) Electronic vibration analyzer (EVA)
C) Strobe light D) Scan tool
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The rolling circumference of both tires on the same axle of a four-wheel drive vehicle should be within ________.
A) 0.1 in. (2.5 mm) B) 0.3 in. (7.6 mm) C) 1.2 in. (30 mm) D) 0.6 in. (15 mm)
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A defective clutch release (throw out) bearing is usually heard when the clutch is ________.
A) Depressed to take up any free play B) Engaged in first gear or reverse
C) Engaged in neutral D) Disengaged in gear
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Which of the following is TRUE regarding driveline wind-up?
A) It can cause delay in shifting out of 4WD in electronically controlled systems
B) It can be corrected by lifting the vehicle off the ground
C) It can cause a hop of the front or rear tires when driving in 4WD mode on dry pavement
D) All of these are correct
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