ASE H8 Preventive Maintenance & Inspection (Transit Bus) Feed

Question

During a transit bus PM inspection, a technician finds the engine coolant level low and a dried, light-colored crusty residue around a hose clamp. What is the BEST conclusion?

Engine Systems

Question · Easy

Question

On a diesel transit bus PM, the charge-air cooler (CAC) is being inspected. Which finding most directly indicates a CAC problem affecting performance?

Engine Systems

Question · Easy

Question

Technician A says a serpentine belt should be replaced if cracks are deep or there are more than about three cracks per inch in a rib. Technician B says glazed, shiny belt surfaces indicate slippage and should be noted. Who is correct?

Engine Systems

Question · Easy

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Question

While inspecting a transit bus engine compartment, a technician must verify the automatic engine fire-suppression system. Which check is MOST appropriate during PM?

Engine Systems

Question · Easy

Question

A transit bus is equipped with an engine idle-shutdown timer. During PM, the BEST way to verify it functions is to:

Engine Systems

Question · Easy

Question

During a diesel transit bus PM, the diesel exhaust fluid (DEF) tank is nearly empty and the DEF quality lamp is on. What is the correct PM action?

Engine Systems

Question · Easy

Question

A technician checks engine oil level on a transit bus at PM. For the MOST accurate reading, the dipstick should be checked with the:

Engine Systems

Question · Easy

Question

On a transit bus PM, fresh wet oil is found on the underside of the engine and a drip is forming at the rear of the oil pan near the bell housing. The MOST likely source is:

Engine Systems

Question · Easy

Question

Which cooling-system PM finding on a transit bus is the strongest reason to remove the bus from service immediately?

Engine Systems

Question · Easy

Question

During PM, a transit bus power-steering reservoir is low and the fluid is dark and smells burnt. The BEST interpretation is:

Engine Systems

Question · Easy

Question

A coolant hose on a transit bus feels soft and spongy when squeezed and shows surface checking. During PM the technician should:

Engine Systems

Question · Easy

Question

On a transit bus PM, an exhaust leak is found upstream of the diesel particulate filter (DPF). Why is this significant beyond a noise concern?

Engine Systems

Question · Medium

Question

During PM the engine air-filter restriction indicator on a transit bus shows the filter is fully restricted. The correct action is to:

Engine Systems

Question · Easy

Question

A CNG transit bus is being PM-inspected. Which engine-compartment fuel-system check is MOST critical for safety?

Engine Systems

Question · Hard

Question

Technician A says a glazed, slipping belt can cause an undercharged battery and overheating because the alternator and water pump are belt-driven. Technician B says belt tension on an automatic-tensioner system is set by replacing the tensioner if it is at its travel limit. Who is correct?

Engine Systems

Question · Medium

Question

On a transit bus PM, the surge tank shows oil contamination in the coolant. This finding MOST likely indicates:

Engine Systems

Question · Hard

Question

During PM, the transmission fluid on a transit bus (checked per the maker's procedure) is milky and pinkish. The BEST conclusion is:

Engine Systems

Question · Medium

Question

A transit bus PM checklist requires verifying coolant freeze/corrosion protection. The MOST appropriate method is to:

Engine Systems

Question · Medium

Question

During engine-compartment PM, a technician finds the radiator surge/recovery cap will not hold rated pressure during a pressure test. The result is:

Engine Systems

Question · Medium

Question

On a diesel transit bus, the DPF differential-pressure reading is much higher than normal during PM. This MOST likely indicates:

Engine Systems

Question · Medium

Question

A technician checks engine mounts during transit bus PM. Which finding should be documented as a defect?

Engine Systems

Question · Easy

Question

During PM, fuel is found dripping from a diesel transit bus fuel filter housing. The correct action is to:

Engine Systems

Question · Easy

Question

A transit bus engine compartment has heavy oil and debris buildup. Why is cleaning and documenting this important during PM?

Engine Systems

Question · Easy

Question

During PM the technician notices the engine coolant level drops between inspections but no external leak is visible. The NEXT best step is to:

Engine Systems

Question · Hard

Question

On a transit bus PM, which is the BEST practice when checking belts and pulleys?

Engine Systems

Question · Easy

Question

During PM a diesel transit bus shows white coolant-smelling smoke from the exhaust and slow coolant loss. The MOST likely cause is:

Engine Systems

Question · Hard

Question

A technician verifies the engine compartment access door interlock on a transit bus during PM. The correct expectation is that:

Engine Systems

Question · Medium

Question

During PM, the diesel transit bus's automatic regeneration has not completed for several cycles and a DPF warning is active. The BEST action is to:

Engine Systems

Question · Hard

Question

On a transit bus PM, which engine-compartment leak should be classified as the highest immediate fire risk?

Engine Systems

Question · Medium

Question

A transit bus uses extended-service-interval engine oil. During PM the technician should base the oil change decision on:

Engine Systems

Question · Medium

Question

During PM, the technician finds the air-intake hose clamp loose between the air cleaner and turbo on a diesel transit bus. The PRIMARY concern is:

Engine Systems

Question · Medium

Question

Technician A says coolant should be checked for the correct freeze point AND for proper supplemental coolant additive (SCA) level in heavy-duty diesels. Technician B says a low coolant level always means the radiator cap is bad. Who is correct?

Engine Systems

Question · Medium

Question

During PM, the fire-suppression cylinder gauge on a transit bus reads in the low/red zone. The correct action is to:

Engine Systems

Question · Medium

Question

On a transit bus PM, which is the correct way to check for an exhaust/aftertreatment leak in the engine compartment safely?

Engine Systems

Question · Medium

Question

During a transit bus PM, the passenger door fails to open fully and the door-control air pressure is below normal. The MOST appropriate first step is to:

Body Interior Exterior

Question · Medium

Question

On a transit bus PM, a technician must verify the passenger-door-to-brake/throttle interlock. The interlock should:

Body Interior Exterior

Question · Medium

Question

During PM, the wheelchair ramp on a low-floor transit bus deploys slowly and does not lie flat at full extension. The BEST PM conclusion is:

Frame And Chassis

Question · Medium

Question

A transit bus kneeling system is checked during PM. Which finding is a reportable defect?

Frame And Chassis

Question · Medium

Question

During PM, a passenger seat is found loose at its floor/wall mounting on a transit bus. The correct action is to:

Body Interior Exterior

Question · Easy

Question

On a transit bus PM, the emergency exit window release is stiff and the 'emergency exit' buzzer/light does not activate when the window is opened. This is:

Body Interior Exterior

Question · Medium

Question

During PM, an exterior rearview mirror on a transit bus is cracked and vibrates so the image is blurred at speed. The correct disposition is:

Body Interior Exterior

Question · Easy

Question

A transit bus destination sign shows partial/garbled characters during PM. The BEST PM action is to:

Body Interior Exterior

Question · Easy

Question

During PM, the wheelchair securement straps and floor anchors on a transit bus are inspected. Which condition requires the bus to be taken out of service for that item?

Frame And Chassis

Question · Medium

Question

Technician A says interior stanchions and grab rails should be checked for looseness, sharp edges, and secure mounting during PM. Technician B says passenger compartment cleanliness has no place on a PM inspection. Who is correct?

Body Interior Exterior

Question · Medium

Question

During PM, the technician finds the wheelchair lift platform barrier (roll-stop) does not deploy when the platform is raised. This means:

Frame And Chassis

Question · Medium

Question

On a transit bus PM, which interior finding is correctly classified as a safety defect rather than a cleanliness item?

Body Interior Exterior

Question · Easy

Question

During PM, the technician verifies the operator's side window and door seals. Why is this part of the inspection?

Body Interior Exterior

Question · Easy

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