What does a circuit opening relay do?

The function of the COR is to switch power to the fuel pump when the engine is running or being started. Having power to the fuel pump only when the engine is being started or is running is a safety feature.

What does the EFI relay control?

The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump.

What is the EFI fuse for?

EFI fuse powers your circuit opening relay,fuelpump and sender,O2 sensors, IAC valve,MAF meter, VSV for EGR, VSV for EVAP, VSV for pressure sensor, ECM, and Point side of the EFI relay.

What happens when main relay goes bad?

If the main relay is not supplying the engine computer with the power it needs, then the engine will not be able to crank and run the right way. Failing to get the main relay replaced will usually lead to the car being unusable.

How to troubleshoot electrical wiring in a Toyota Camry?

When the circuit operation is understood, begin troubleshooting of the problem circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing sections to find each part, junction block and wiring harness connectors, wiring harness and wiring harness connectors and ground points of each system circuit.

Where is the fuel pump relay on a Toyota?

The relay you are talking about is called the “Circuit Opening Relay” and is located on top of the ECU, which is between the driver and passenger footwell behind the radio. You can get to it by pulling back the front inner corner of the passenger carpet.

What are the main relays in a Toyota engine?

Generally speaking, the EFI Main Relay supplies current to the following major circuits: • Injectors (dual relay or dual contact relay only) • Circuit opening relay (power contact and pull-in windings) • Air flow meter VB circuit (when so equipped) • Output Actuator Vacuum Switching Valves (VSV) – Exhaust Gas Recirculation (EGR)

How does the fuel injector relay circuit work?

It uses separate power contacts to supply current to the fuel injector/ignition circuits and the ECU/circuit opening relay circuit. This limits current flow that the ECU power contact must handle.

What would cause a fuel pump relay to go bad?

The most common cause of a fuel pump relay going bad is electrical power surges that increase the voltage. The fuel pump relay is designed to have a winding that causes contacts to pass current or voltage. In some cases, the current or voltage might be so high that the contacts get burned.

How does circuit opening relay work in Toyota 4Runner?

PLEASE DOUBLE CHECK WIRE COLORS AND SCHEMATIC AGAINST YOUR OWN FSM BECAUSE SOME TRUCK WIRING MAY TRANSITION DURING A YEAR. The relay prevents unwanted, unsafe fuel flow (i.e., in case of an accident when fuel line ruptures, engine stalls, airflow stops and COR interrupts power to the fuel pump).

Where is the cor located on a Toyota 4Runner?

COR is the thing that you’d hear click behind the glovebox when you’re trying to start a first gen 4Runner. However, it does not affect cranking system. (In 1986 Runner) COR is located behind glove compartment near speaker and blower motor. Someone had posted about moisture in COR. Possible because:

Why does the pump relay go out when the starter starts?

The jumper on the 22RE makes the connection from Pump relay to Ground So yes the light goes out once it starts because it finds another way to ground decides the light. It has to have a way to pressure BEFORE it starts. Hence what looks like a Second trigger in the COR that looks to be triggered when The truck is actively cranking the starter.

How does the circuit opening relay ( Cor ) work?

Circuit Opening Relay (COR) has two normally-open contacts (open when no power is applied). Coil 1 of COR is energized by IGN switch while in START position.

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What does a circuit opening relay do?