240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
This is powered by an electric motor. It starts when the SET SPEED button is pressed, causing the control unit relay to cut in. This feeds current to the
motor and connects it to ground. The motor drives the vacuum pump until the vacuum servo has reached sufficient vacuum to maintain the desired
speed as indicated by the connection to the speedometer. The control unit then breaks the vacuum pump ground connection.
If an increased throttle setting is required on an upgrade, the vacuum pump will start working again and increase the negative pressure until the
required speed is reached. On downgrades, the vacuum valve opens and admits ambient air, reducing the negative pressure in the vacuum valve and
the throttle opening.
On small speed changes the vacuum pump operates only for fractions of a second.
Vacuum valves (pedal valves)
