Question

what occurs if the abs control module recognizes a locking wheel?
a) the hcu opens a solenoid valve to increase hydraulic pressure to the affected brake.
b) the abs control module automatically limits engine torque.
c) the hcu closes a solenoid valve to prevent hydraulic pressure from increasing to the affected brake.
d) all of the above.

Explanation:

Let's analyze each option:

• Option A: When the ABS control module recognizes a locking wheel, the Hydraulic Control Unit (HCU) does not open a solenoid valve to increase hydraulic pressure. Increasing pressure would make the wheel more likely to lock.
• Option B: The ABS control module's main function related to a locking wheel is about brake pressure modulation, not limiting engine torque. Engine torque limiting is more related to other systems like traction control in some cases.
• Option C: When the ABS control module detects a wheel about to lock, the HCU closes a solenoid valve. This prevents further increase in hydraulic pressure to the affected brake, allowing the wheel to regain traction.

Answer:

C. The HCU closes a solenoid valve to prevent hydraulic pressure from increasing to the affected brake.