ASE MAINTENANCE AND
LIGHT REPAIR MLR
PRACTICE EXAM
COMPLETE 55Q
Question 1: A vehicle has a coolant odor and a slow coolant loss, but no external leak is visible. Which test is most appropriate �rst to help locate a small cooling- system leak?
Choices:
1) Cooling-system pressure test 2) Cylinder balance test 3) Charging-system output test 4) Fuel-pressure test
Correct Answer: Cooling-system pressure test
Explanation: A cooling-system pressure test pressurizes the system with the engine o� and can reveal small external leaks at hoses, radiator seams, the water pump, heater core, and �ttings.Page 1
Question 2: After replacing engine coolant, the temperature gauge �uctuates and the heater output alternates between hot and cool. What is the most likely cause?
Choices:
1) Incorrect spark plug gap 2) Air trapped in the cooling system 3) A restricted air �lter 4) Low transmission �uid
Correct Answer: Air trapped in the cooling system
Explanation: Air pockets can interrupt coolant circulation through the engine and heater core.Proper bleeding after service removes trapped air and stabilizes temperature and heater output.Question 3: An accessory drive belt shows cracks across several ribs and squeals during acceleration. What is the best service action?
Choices:
1) Lubricate the belt with silicone 2) Increase engine idle speed 3) Replace the belt and inspect the tensioner and pulleys 4) Tighten the battery terminals
Correct Answer: Replace the belt and inspect the tensioner and pulleys
Explanation: A cracked and slipping belt should be replaced. The tensioner and pulleys must also be inspected because weak tension or pulley problems can cause noise and premature belt wear.Page 2
Question 4: A technician retrieves DTC P0456, indicating a very small EVAP leak.Which item should be inspected early in the diagnosis?
Choices:
1) Fuel cap and sealing surface 2) Engine oil viscosity 3) Brake booster pushrod 4) Wheel bearing preload
Correct Answer: Fuel cap and sealing surface
Explanation: A loose, damaged, or poorly sealing fuel cap is a common source of a small EVAP leak and should be inspected along with the �ller neck and EVAP hoses.Question 5: An engine oil change is completed on a vehicle equipped with an oil-life monitoring system. What additional step is normally required?
Choices:
1) Reset the oil-life monitor according to the service procedure 2) Disconnect the alternator for 10 minutes 3) Bleed the cooling system 4) Relearn the TPMS sensors
Correct Answer: Reset the oil-life monitor according to the service procedure
Explanation: After the oil and �lter are changed, the oil-life monitor should be reset so future maintenance reminders are based on the new service interval.Page 3