What wire circuits connect the E4OD transmission solenoids to the PCM on a 1995 Bronco?

Circuit 923 (O/BK) and 924 (BR/O) for the transmission oil temperature sensor and coast clutch, 315 (P/O) for the #2 shift solenoid, 480 (P/Y) for the torque converter clutch solenoid, 237 (O/Y) for the #1 shift solenoid, and 925 (W/Y) for the electronic pressure control solenoid, going to PCM pins 42/49*, 55, 19/52*, 53, 52/51*, and 38 (* = 5.0L and 5.8L California).

What powers the E4OD transmission solenoids?

A 20A hot-at-all-times fuse in the engine compartment fuse box feeds circuit 37 (Y) to the PCM Power Relay; when energized, the relay directs 12V through circuit 361 (R) to the shift solenoids, EPC solenoid, and torque converter clutch solenoid. A separate 20A hot-in-start-or-run fuse feeds circuit 16 (R/LG) through the PCM Power Diode via circuit 175 (BK/Y).

What does the transmission oil temperature sensor do?

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

What is the Electronic Pressure Control (EPC) solenoid?

It is a variable force type solenoid that regulates transmission line pressure, connected via circuit 925 (W/Y) through connector C1048 to PCM pin 38.

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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1995 Ford Bronco E4OD Transmission Wiring Diagram - Solenoids & PCM Circuits

1995 Ford Bronco E4OD transmission electrical wiring diagram, EVTM page 30-2

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E4OD automatic transmission wiring schematic showing PCM control of the transmission oil temperature sensor, coast clutch, shift solenoids 1 and 2, TCC solenoid and Electronic Pressure Control (EPC) solenoid.

AI caption April 2011 · Photo 960 of 2216

This is page 30-2 from a 1995 Ford Bronco electrical/wiring manual covering the E4OD automatic transmission control circuit. The schematic shows two power feeds from the engine compartment fuse box: a 20A hot-in-start-or-run fuse feeding circuit 16 (R/LG) through the PCM Power Diode via circuit 175 (BK/Y), and a 20A hot-at-all-times fuse feeding circuit 37 (Y) to the PCM Power Relay, which directs voltage via circuit 361 (R) to the transmission solenoids. Inside the E4OD transmission connector, the diagram details the Transmission Oil Temperature Sensor and five solenoids: Coast Clutch, #2 Shift, Torque Converter Clutch, #1 Shift, and Electronic Pressure Control (EPC), with connector pin numbers (1-8, 11, 12). Return circuits to the Powertrain Control Module include 923 (O/BK), 924 (BR/O), 315 (P/O), 480 (P/Y), 237 (O/Y), and 925 (W/Y), passing through connectors C103F/C103M, C110F/C110M, C1048, and C185, with PCM pins 42/49*, 55, 19/52*, 53, 52/51*, and 38 (asterisk noting 5.0L and 5.8L California). Explanatory callouts describe the temperature sensor's role in shift scheduling, the coast clutch and TCC solenoid functions, the EPC variable-force solenoid, and the shift solenoids' control of gears one through four. Cross-references point to Power Distribution (page 13-5), Grounds (page 10-1), and PCM pages 24-3, 25-2, 25-8.

This document covers 1995, which may differ from this 1992 Ford Bronco.

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Frequently asked questions

What wire circuits connect the E4OD transmission solenoids to the PCM on a 1995 Bronco?: Circuit 923 (O/BK) and 924 (BR/O) for the transmission oil temperature sensor and coast clutch, 315 (P/O) for the #2 shift solenoid, 480 (P/Y) for the torque converter clutch solenoid, 237 (O/Y) for the #1 shift solenoid, and 925 (W/Y) for the electronic pressure control solenoid, going to PCM pins 42/49*, 55, 19/52*, 53, 52/51*, and 38 (* = 5.0L and 5.8L California).
What powers the E4OD transmission solenoids?: A 20A hot-at-all-times fuse in the engine compartment fuse box feeds circuit 37 (Y) to the PCM Power Relay; when energized, the relay directs 12V through circuit 361 (R) to the shift solenoids, EPC solenoid, and torque converter clutch solenoid. A separate 20A hot-in-start-or-run fuse feeds circuit 16 (R/LG) through the PCM Power Diode via circuit 175 (BK/Y).
What does the transmission oil temperature sensor do?: The PCM monitors the voltage drop across a temperature sensitive thermistor to determine transmission fluid temperature, used to adjust shift schedules and torque converter engagement when the fluid is cold, and to adjust EPC pressure for temperature.
What is the Electronic Pressure Control (EPC) solenoid?: It is a variable force type solenoid that regulates transmission line pressure, connected via circuit 925 (W/Y) through connector C1048 to PCM pin 38.
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.