Technician A says on-demand 4WD systems are controlled by the PCM/TCM. Technician B says when slip is detected at the rear wheels, the duty cycle to the output clutch at the transfer case is decreased. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because on-demand 4WD systems are indeed often controlled by the vehicle's Powertrain Control Module (PCM) or Transmission Control Module (TCM), which manage the distribution of power to the wheels based on various inputs. Technician B is incorrect because when slip is detected at the rear wheels, the duty cycle to the output clutch at the transfer case is typically increased, not decreased, to send more power to the front wheels to regain traction.

Technician a Says On-Demand 4WD Systems Are Controlled by the PCM/TCM