Fuel Pump Electrical Controls and Circuit Opening Relay

Circuit Opening Relay Circuits There are three types of fuel pump control circuits used on Toyota's EFI engines. One type of control, used exclusively with L type injection, utilizes the air flow meter Fc contact to complete the circuit opening relay run winding ground. This is a safety feature which prevents the fuel pump from operating when the engine is not running.

Circuit Open Relay For Yaris 2007

A second type of fuel pump control uses the ECU to control circuit opening relay run winding current. Used on engines equipped with D type EFI and on the 7M-GTE, which uses a Karman vortex air flow meter, this safety feature prevents fuel pump operation whenever the ECU fails to see an Ne (engine rpm) signal. Under these conditions, the ECU removes ground from the circuit opening relay run winding.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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