Transmission Overview
These two transmissions are fully computer controlled versions of the A4LD. These units have six solenoids: three shift solenoids, a lockup solenoid, a coast clutch solenoid, and an electronic pressure control solenoid. The solenoids receive power when the key is on, and the computer grounds the solenoids to energize them.

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, only solenoid 1 receives ground.

Second Gear
To shift into second gear, the computer grounds solenoid 2; solenoids 1 and 2 are grounded.

Third Gear
In shift into third gear, the computer releases solenoids 1 and 2; none of the solenoids receives ground.

Fourth Gear
In shift into fourth gear, the computer only grounds solenoid 3; solenoid 1 and 2 remain open. The gray lines are the connections necessary to apply the converter clutch.

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