What fuses power the E4OD transmission circuit?

Two 20A fuses in the engine compartment fuse box (see page 13-5): one hot in start or run feeding circuits 16 R/LG and 175 BK/Y, and one hot at all times feeding circuit 37 Y (marked 5.0L only), supplying the PCM power diode and PCM power relay.

What does the PCM power relay do in the E4OD circuit?

It directs voltage to the shift solenoids, Electronic Pressure Control (EPC) solenoid, and Torque Converter Clutch (TCC) solenoid via circuits 361 R and 912 W/R (12V when the relay is energized).

What are the wire colors for the E4OD solenoids to the PCM?

Transmission oil temperature sensor 923 O/BK and return 359 GY/R side, coast clutch solenoid 924 BR/O, #2 shift solenoid 315 P/O, torque converter clutch solenoid 480 P/Y, #1 shift solenoid 237 O/Y, and EPC solenoid 925 W/Y, through connectors C103, C110, C1048 and C185.

What does the EPC solenoid do?

The Electronic Pressure Control (EPC) solenoid is a variable force type solenoid that regulates transmission line pressure.

How does the PCM use the transmission oil temperature sensor?

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

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Ford E4OD Transmission Wiring Diagram (Gasoline) - Solenoids, PCM & Circuits

Ford EVTM page 30-2: E4OD gasoline transmission solenoid wiring diagram

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Wiring diagram for the E4OD gasoline transmission detailing shift solenoids, torque converter clutch and electronic pressure control circuits.

AI caption July 2017 · Photo 294 of 386

This document is a wiring diagram page (labeled "30-2 E4OD Transmission, Gasoline", marked "94") showing the electrical circuit for the Ford E4OD automatic transmission in gasoline-engine applications. It traces power from the engine compartment fuse box: a 20A fuse hot in start or run (circuits 16 R/LG and 175 BK/Y) and a 20A fuse hot at all times (circuit 37 Y) feeding the PCM Power Diode and PCM Power Relay, which directs voltage to the shift solenoids, EPC solenoid, and TCC solenoid via circuits 361 R and 912 W/R. The diagram details the E4OD transmission internal components — transmission oil temperature sensor, coast clutch solenoid, #2 shift solenoid, torque converter clutch solenoid, #1 shift solenoid, and electronic pressure control solenoid — with their connector pins and wire circuits (923 O/BK, 924 BR/O, 315 P/O, 480 P/Y, 237 O/Y, 925 W/Y) running through connectors C103, C110, C1048, and C185 to the Powertrain Control Module. Explanatory callouts describe how the PCM uses the temperature sensor, how the TCC and coast clutch solenoids operate, that the EPC solenoid is a variable-force solenoid regulating line pressure, and that shift solenoids control first-through-fourth gear selection. Ground path is via 57 BK to G100 through splice S102; a note flags circuit 37 Y as 5.0L only.

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Frequently asked questions

What fuses power the E4OD transmission circuit?: Two 20A fuses in the engine compartment fuse box (see page 13-5): one hot in start or run feeding circuits 16 R/LG and 175 BK/Y, and one hot at all times feeding circuit 37 Y (marked 5.0L only), supplying the PCM power diode and PCM power relay.
What does the PCM power relay do in the E4OD circuit?: It directs voltage to the shift solenoids, Electronic Pressure Control (EPC) solenoid, and Torque Converter Clutch (TCC) solenoid via circuits 361 R and 912 W/R (12V when the relay is energized).
What are the wire colors for the E4OD solenoids to the PCM?: Transmission oil temperature sensor 923 O/BK and return 359 GY/R side, coast clutch solenoid 924 BR/O, #2 shift solenoid 315 P/O, torque converter clutch solenoid 480 P/Y, #1 shift solenoid 237 O/Y, and EPC solenoid 925 W/Y, through connectors C103, C110, C1048 and C185.
What does the EPC solenoid do?: The Electronic Pressure Control (EPC) solenoid is a variable force type solenoid that regulates transmission line pressure.
How does the PCM use the transmission oil temperature sensor?: The PCM monitors the voltage drop across a temperature-sensitive thermistor to determine transmission fluid temperature, adjusting shift schedules and torque converter engagement schedules when the fluid is cold, and also adjusting EPC pressure for temperature.