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Home >> Toyota >> 1994 >> Pickup Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - Basic Testing - V6) >> Fuel System >> Fuel Pump Control Circuit >> Circuit Opening Relay
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Circuit Opening Relay

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Circuit opening relay controls fuel pump circuit. When engine is cranking, circuit opening relay receives a start signal.

Start signal energizes circuit opening relay during cranking. Circuit opening relay then provides voltage to fuel pump.

On Pickup, T100 3.0L and 4Runner fuel pump switch in airflow meter provides ground for circuit opening relay. On all other models, circuit opening relay is grounded by ECM through the FC terminal.