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Circuit Opening Relay

WARNING: This page is about a different car, the 1993 Toyota Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Circuit opening relay controls fuel pump circuit. The Engine Control Module (ECM) receives an input signal at STA terminal when engine is cranking. Starter signal is also applied to STA terminal of circuit opening relay.

Starter signal energizes circuit opening relay during cranking. Circuit opening relay then provides voltage to fuel pump or fuel pump relay. The fuel pump switch in the airflow meter provides ground for circuit opening relay.

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