EPC Solenoid Control

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

At a low current, the TV circuit pressure will be higher, resulting in high line pressure.
At a high current, the TV circuit pressure will be lower, resulting in lower line pressure.
In a fail-safe mode, maximum TV circuit pressure will be present in maximum line pressure.

Fig 1: Line Pressure Circuits (D, S OR L Ranges)

Courtesy of MAZDA MOTORS CORP.