Unit 1 Mod 2 & 3 Test Review

Which of the following tools can be used to test the operation of the thermostat without removing it from the engine?

• Combustion leak check dye

• Black light and leak detector dye

• Digital infrared thermometer

• Cooling system pressure tester

Technician A says a cooling system pressure tester is used for leaks in the radiator, hoses, water pump, thermostat, and engine assembly. Technician B sys the cooling system pressure tester is used to check the operation of the relief valve in the radiator cap. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

The typical recommended mixture of water and antifreeze is _____.

• 40/60

• 60/40

• 30/70

• 50/50

When testing a radiator cap, with the rated pressure applied, the cap should hold that pressure for at least ______.

• 5 minutes

• 1 minute

• 20 minutes

• 30 seconds

Technician A says an electric cooling fan may come on at any time without warning, even if the engine is not running. Technician B says an electric cooling fan may be controlled by the engine control computer. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

Which of the following is not a PCM output?

• Thermostats

• Solenoids

• Relays

• Lights (indicator)

What sensor is used to detect engine misfire?

• Knock

• Crankshaft position

• Exhaust gas temperature

• Cylinder head temperature

Diagnostic trouble codes are being discussed. Technician A says a P0442 is a manufacturer's code and means different things, depending on what manufacturer built the car. Technician B says that a P0304 code is a universal code that means the same thing no matter what manufacturer built the car. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

Before performing any repairs on a vehicle with an illuminated MIL light: Technician A records all DTCs and freeze frame data. Technician B checks for service bulletins. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

The injector pulse width is the ______.

• Amount of time the injector opens and sprays fuel

• Size of the injector nozzle

• Distance between the injector tip and the center of the intake port

• Voltage applied to the injector solenoid coil