Computerized Engine Controls: Description
The Volvo Computerized Engine Control System is used on all Volvo 4-cylinder engines except for GLT Turbo. It consists of a Computer Controlled Electronic Ignition System and Constant Idle Speed System.
The computer controlled ignition consists of Volvo breakerless distributor, an electronic control unit, ignition coil, ignition switch, and a vacuum signal micros-switch. The distributor contains no vacuum or centrifugal advance mechanisms. The rotor and armature are a single unit. See Fig 1.
Distributor contains Hall sending unit.
A Hall Effect sending unit in the distributor provides engine speed signals to the electronic control unit. The distributor also consists of necessary connecting wiring and a distributor cap. The Constant Idle Speed System includes an electronic control unit, air control valve, throttle switch, coolant sensor and connecting wiring and hoses.