240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
The cruise control cannot maintain the set speed underall conditions. At a given upward gradient the power of the engine is simply insufficient even
though the vacuum servo has opened the throttle fully.
On a steep downgrade the set speed may be exceeded even though the throttle is closed, because engine braking alone can be insufficient.
NOTE:
Since the control unit is grounded through the brake circuit, the brake light bulbs must be functional for the cruise control system to
operate. If the cruise control system develops a fault, the first thing to check is the brake lights.