Which of these is not a part of the basic configuration of an ABS?
- Throttle position sensor ✓
- ABS valves
- Wheel speed sensor
- An electronic control unit
Answer: A. Throttle position sensor
The throttle position sensor is not part of the basic configuration of an ABS.
Why this is the answer
The handbook's ABS description focuses on wheel speed: ABS senses the speed of the wheels during braking, and when wheel speed drops abnormally it reduces brake force to that wheel. That is how it prevents tire skid and loss of steering control. Nothing in the description makes engine throttle position part of the system. The other listed items fit that wheel-speed-and-brake-control picture, while a throttle position sensor reports engine throttle, not wheel behaviour.
Why the other answers are wrong
- B. ABS valves — ABS valves are part of the brake-control hardware that reduces brake force at a wheel, which is the action the handbook describes.
- C. Wheel speed sensor — A wheel speed sensor is central to ABS because the handbook says the system senses wheel speed during braking.
- D. An electronic control unit — An electronic control unit is the control component that processes wheel-speed information and commands the brake-force reduction described in the handbook.
Remember it
Think wheels first: ABS watches wheel speed and brake force, not how far the throttle is open.
Official handbook: Official MTO Truck Handbook, Driving at night and in bad weather – Skids