What wire colors connect the E4OD solenoids to the PCM?

Circuit 923 O/BK (transmission fluid temp sensor), 924 BR/O (coast clutch solenoid), 315 P/O (#2 shift solenoid), 480 P/Y (torque converter clutch solenoid), 237 O/Y (#1 shift solenoid), and 925 W/Y (EPC solenoid).

How does the PCM use the transmission fluid temperature sensor?

The PCM monitors the voltage drop across a temperature-sensitive thermistor to determine fluid temperature, adjusting shift schedules and torque converter engagement when the fluid is cold, and adjusting EPC pressure, shift, and torque converter schedules for temperature.

What is the function of the Electronic Pressure Control (EPC) solenoid?

The EPC solenoid is a variable force type solenoid that regulates transmission line pressure.

What do the shift solenoids do in the E4OD?

The shift solenoids provide gear selection of first through fourth by controlling the pressure to the shift valves.

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1996 Ford E4OD Transmission Controls Wiring Diagram (Gasoline) - Page 30-2

96 Bronco 30-2 Transmission Controls (E4OD) Gasoline wiring diagram: shift/coast/TCC solenoids, EPC solenoid, PCM power relay

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E4OD transmission controls wiring diagram for 1996 Ford Bronco gasoline showing shift, coast and EPC solenoid circuits.

AI caption July 2017 · Photo 258 of 386

This is page 30-2 of a 1996 Ford EVTM (Electrical & Vacuum Troubleshooting Manual) wiring diagram covering the Transmission Controls for the E4OD automatic transmission in gasoline-engine applications. The diagram shows power flow from the engine compartment fuse box (hot in start/run through a 20A fuse and hot at all times through a 30A fuse) to the PCM power diode and PCM power relay, which directs voltage to the E4OD's shift solenoids, Electronic Pressure Control (EPC) solenoid, coast clutch solenoid, and torque converter clutch (TCC) solenoid. It details each solenoid and the transmission fluid temperature sensor inside the E4OD transmission connector (C1048), along with wire circuit numbers and colors (923 O/BK, 924 BR/O, 315 P/O, 480 P/Y, 237 O/Y, 925 W/Y) running through connectors C103F/C103M and C185/C1027 to specific Powertrain Control Module (PCM) pins. Explanatory callouts describe how the PCM uses the temperature thermistor to adjust shift and torque converter schedules, how the EPC variable force solenoid regulates line pressure, and how the shift solenoids provide first-through-fourth gear selection. Cross-references point to related pages for power distribution (13-5 to 13-9), grounds (10-1), and PCM pages (23-3 through 27-3).

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Frequently asked questions

What does the PCM power relay do in the E4OD transmission circuit?: It directs voltage to the shift solenoids, Electronic Pressure Control (EPC) solenoid, coast clutch solenoid, and Torque Converter Clutch (TCC) solenoid.
What wire colors connect the E4OD solenoids to the PCM?: Circuit 923 O/BK (transmission fluid temp sensor), 924 BR/O (coast clutch solenoid), 315 P/O (#2 shift solenoid), 480 P/Y (torque converter clutch solenoid), 237 O/Y (#1 shift solenoid), and 925 W/Y (EPC solenoid).
How does the PCM use the transmission fluid temperature sensor?: The PCM monitors the voltage drop across a temperature-sensitive thermistor to determine fluid temperature, adjusting shift schedules and torque converter engagement when the fluid is cold, and adjusting EPC pressure, shift, and torque converter schedules for temperature.
What is the function of the Electronic Pressure Control (EPC) solenoid?: The EPC solenoid is a variable force type solenoid that regulates transmission line pressure.
What do the shift solenoids do in the E4OD?: The shift solenoids provide gear selection of first through fourth by controlling the pressure to the shift valves.