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940 L4-2.3L SOHC VIN 88 B230F (1992)

Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Description and Operation > Bendix

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Fuel Pump Relay: Description and Operation
Bendix

The system relay (located in center console behind the ash-tray) is a combined function relay. It combines the fuel pump and fuel injection relay into one
unit. The system relay provides current to the fuel pumps, suppressor relay, idle air valve, air mass meter, oxygen sensor pre-heating resistor and to other
ECU controlled functions or components.

The fuel injection ECU controls the relay ground connection. When ground is supplied, the system relay is activated and currant can flow to all the
related components. If the ground connection is interrupted, no current can reach the components. This enables the fuel injection ECU to control the fuel
pump operation.

The fuel pumps are activated only when the ECU receives an engine speed signal. Should the engine stop in case of an accident or other reason, the
power supply to the fuel pumps will be interrupted by the system relay, reducing the risk of fire in case of a fuel leak.  

Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Fuel Delivery and Air Induction > Fuel Pump Relay > Component Information > Description and Operation > Bendix

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