Code 7 - No Valve Isolation
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1988 Ford Pickup, 1988 Ford Cab & Chassis, 1988 Ford Bronco II, 1988 Ford Bronco, and 1987 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Unplug computer module connector. Check resistance between terminal No. 13 and ground. If resistance is 3-6 ohms, replace computer module. If resistance is less than 3 ohms, unplug electro-hydraulic connector. Check resistance between terminals No. 2 and 3. If resistance is less than 3 ohms, replace electro-hydraulic valve. If resistance is 3-6 ohms, repair shorted wire between terminal No. 2 on solenoid connector and computer module.