Technician A says the EPC solenoid is a PWW (pulse width modulated)solenoid and receives a duty cycle signal from the TCM. Technician B says the EPC solenoid is an on/off solenoid that is turned on when the TCM sees the 3-4 upshift. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the EPC (Electronic Pressure Control) solenoid in modern automatic transmissions is indeed a PWM (Pulse Width Modulated) solenoid. It receives a duty cycle signal from the Transmission Control Module (TCM) to precisely control hydraulic pressure based on the vehicle's driving conditions, not just for a specific gear shift like the 3-4 upshift. Technician B's description of it as an on/off solenoid is incorrect for this context.

Technician a Says the EPC Solenoid Is a PWW (Pulse