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Home >> Volvo >> 1994 >> 940 Base, 4D Sedan, AW71 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Control Units
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Control Units

Electronic Control Units (ECUs) provide precise control of fuel, ignition and turbo operation (if equipped). Each system has self-diagnostic capabilities. 940 turbo and non-turbo models use separate Electronic Control Units (ECUs) for fuel injection and ignition control. 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.

960 models use a single ECU for ignition and fuel controls. ECU is located above and to the right of accelerator pedal.

850 non-turbo models use separate ECUs for fuel injection and ignition control. 850 turbo models use a single ECU for ignition and fuel controls. On all 850 models, ECU(s) is located in right front of engine compartment.

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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