CALA Automotive Systems and Terminology 4 — Questions and Answers
Question 1: In a rear-end collision claim, an adjuster finds the 'crush initiator' structures are deformed. What is their purpose?
- To prevent trunk intrusion by reinforcing the rear body panel
- To trigger predictable, controlled deformation of rear rails to absorb crash energy (Correct answer)
- To protect the fuel tank from puncture during rear impacts
- To mount the rear bumper cover to the body structure
Correct answer: To trigger predictable, controlled deformation of rear rails to absorb crash energy
Crush initiators are engineered weak points or notches in rear rails that cause them to fold predictably, maximizing energy absorption during a rear collision.
Question 2: What is 'camber' in wheel alignment terminology?
- The side-to-side tilt of the tire when viewed from the front of the vehicle (Correct answer)
- The inward or outward angle of the steering pivot axis
- The height difference between the front and rear of the vehicle
- The distance between the wheel centerline and steering axis
Correct answer: The side-to-side tilt of the tire when viewed from the front of the vehicle
Camber is the vertical tilt of the wheel — negative camber means the top of the tire leans inward, positive means it leans outward, when viewed from the front.
Question 3: Which term describes the electronic system that uses sensors and a computer to detect and correct vehicle oversteer or understeer?
- Traction Control System (TCS)
- Electronic Stability Control (ESC) (Correct answer)
- All-Wheel Drive (AWD) torque vectoring
- Active Suspension Control (ASC)
Correct answer: Electronic Stability Control (ESC)
Electronic Stability Control (ESC) detects loss of directional control and automatically applies selective braking or reduces engine power to correct the vehicle's path.
Question 4: A repair estimate includes replacement of the 'A-pillar.' Where is this located on the vehicle?
- The rear pillar between the trunk and rear window
- The center pillar between the front and rear doors
- The front pillar connecting the roof to the cowl, framing the windshield (Correct answer)
- The structural pillar inside the door panel
Correct answer: The front pillar connecting the roof to the cowl, framing the windshield
The A-pillar is the foremost roof support pillar, located on each side of the windshield, connecting the roof to the front fender/cowl area.
Question 5: What is the purpose of a vehicle's 'torque converter' in an automatic transmission?
- To mechanically lock the engine to the transmission at highway speeds
- To act as a fluid coupling that transfers and multiplies engine torque to the transmission (Correct answer)
- To convert torque from horizontal to vertical rotation for the driveshaft
- To regulate hydraulic pressure within the automatic transmission valve body
Correct answer: To act as a fluid coupling that transfers and multiplies engine torque to the transmission
The torque converter uses transmission fluid to transfer engine torque to the transmission, allowing the engine to idle while the vehicle is stopped and multiplying torque during acceleration.
Question 6: An adjuster assessing a flooded vehicle needs to identify the 'hydrolocked' engine. What caused this condition?
- Coolant leaked into the combustion chambers and froze the piston rings
- Water entered the combustion chambers, causing a non-compressible hydraulic lock when pistons tried to compress it (Correct answer)
- Fuel contaminated with water caused the injectors to seize
- Floodwater corroded the crankshaft bearings, preventing rotation
Correct answer: Water entered the combustion chambers, causing a non-compressible hydraulic lock when pistons tried to compress it
Hydrolocking occurs when enough water enters the cylinders that the pistons cannot compress it (water is incompressible), often bending connecting rods or breaking the engine block.
Question 7: What is the function of the 'EGR valve' (Exhaust Gas Recirculation)?
- It recirculates a portion of exhaust gases back into the intake to lower combustion temperatures and reduce NOx emissions (Correct answer)
- It directs exhaust gases through the catalytic converter at higher velocity for better conversion efficiency
- It prevents exhaust backflow into the intake manifold during engine braking
- It measures exhaust gas oxygen content to adjust the air/fuel ratio
Correct answer: It recirculates a portion of exhaust gases back into the intake to lower combustion temperatures and reduce NOx emissions
The EGR valve recirculates a metered amount of inert exhaust gas into the intake charge, diluting it to reduce peak combustion temperatures and minimize NOx formation.
CALA Automotive Systems and Terminology 4
In a rear-end collision claim, an adjuster finds the 'crush initiator' structures are deformed.
What is their purpose?