Transmission Overview
Introduced in 1994, the CD4E stands for "Chain Driven 4-Speed, Electronic." This unit appears in the Probe, Contour, Mystique, and the Mazda 626 and MX6. This unit uses two shift solenoids, a converter clutch solenoid, a 3-2 coast clutch solenoid, and an electronic pressure control solenoid. The solenoids receive power whenever the key is on; the computer supplies ground to energize the solenoid.

Terminal Identification
Here’s a breakdown of the individual connector terminals:

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:

And here’s the signal pattern you should see:

Forcing the Shift
Here’s the manual shift pattern you can expect with the transmission in failsafe:

And here’s how to force the 4R44E and 4R55E to shift electrically:

First Gear
In first gear, shift solenoids 1 and 2 both receive ground.

Second Gear
To shift into second gear, the computer releases ground from solenoid 1; only solenoid 2 remains grounded.

Third Gear
To shift into third gear, the computer releases solenoid 2; neither shift solenoid is grounded.

Fourth Gear
To shift into fourth gear, the computer grounds solenoid 1; solenoid 2 remains open. The gray lines are the connections necessary to apply the converter clutch. 

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