1993-95 Ford Taurus SHO ATX EPC Pressure Riser Mod Wiring Diagram

This document is a wiring diagram for an "EPC Pressure Riser Mod" applicable to 1993-95 Ford Taurus SHO models with the ATX automatic transmission. The mod inserts two switched resistors into the EPC (Electronic Pressure Control) signal return circuit, identified as the WHT/YEL wire at the transmission connector. The schematic shows two parallel branches: SW1 in series with RES1 (a 33 ohm, 10W resistor) and SW2 in series with RES2 (a 15 ohm, 10W resistor), both tied into the EPC RET line. A legend defines the abbreviations and component values. A switch position/effect table explains the results: both switches open gives normal shift firmness; only SW1 closed gives firmer shifts; only SW2 closed gives very firm shifts; both closed gives extremely firm shifts, with a caution that the last setting is not recommended for extended use. An exploded-view drawing of the transmission connector indicates which pin carries the EPC RET signal. The design is credited to Ben Bentley (original design) and edited by Adam Parrott. A reader learns the resistor values, wire color, tap location, and how each switch combination alters automatic transmission line pressure and shift firmness.