Ford’s E4OD was one of the first Ford transmissions to be designed originally for computer control. It uses two main solenoids to control shifting. These solenoids receive power whenever the key is on; the computer supplies ground to energize them. An EPC solenoid controls mainline pressure electronically.
Here’s a breakdown of the individual connector terminals:
Shown from the terminal side of the transmission connector.
Electronic Pressure Control
To check the electronic pressure control signal, connect your high-impedance voltmeter or signal monitor to the terminals shown.
Checking the Shift Pattern
Here’s how to connect your signal monitor to check the transmission shift signals:
Backprobe the terminals with the harness connector still connected to the transmission.
And here’s the signal pattern you should see:
The far right LED indicates the signal to the converter clutch (TCC) solenoid.
Forcing the Shift
Here’s the manual shift pattern you can expect with the transmission in failsafe:
And here’s how to force the E4OD to shift electrically:
In first gear, only solenoid 1 receives ground.
To shift into second gear, the computer grounds solenoid 2; both shift solenoids are grounded.
To shift into third gear, the computer releases solenoid 1; only solenoid 2 remains grounded.
To shift into fourth gear, the computer releases solenoid 2; neither solenoid is grounded. The gray line shows the connection necessary to apply the converter clutch.