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Home >> Volvo >> 1993 >> 850 Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Control Units

Control Units

All 4 and 5-cylinder models use separate Electronic Control Units (ECUs) for fuel injection and ignition control. Turbo models also use a turbo ECU. 6-cylinder models use a single ECU for ignition and fuel controls. Control unit(s) provide precise control of fuel, ignition and turbo operation. Each system has self-diagnostic capabilities and use same diagnostic unit for trouble code output. On 4-cylinder models, fuel injection control unit is located behind right front kick panel. Ignition control unit is located behind left side of instrument panel, near accelerator pedal. Turbo control unit is located behind left kick panel. On 5-cylinder models, both ECU's are located in right front of engine compartment. On 6-cylinder models, ECU is located above and to the right of accelerator pedal.

NOTE: Components are grouped into 2 categories. The first category is INPUT DEVICES, which are components that control or produce voltage signals monitored by control unit. The second category is OUTPUT SIGNALS, which are components controlled by control unit.
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