What is a circuit opening relay?

What is a circuit opening relay?

Circuit Opening Relay Function 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.

Where is the relay for the fuel pump?

Most fuel-pump relay units are located under the dashboard near the steering column. In some cases, the unit is located in the area where the steering column is mounted or near the engine’s firewall.

What is EFI relay Toyota?

The EFI Relay supplies power to the Circuit Opening Relay, which in turn powers the fuel pump. The next time it fails to start, try removing the COR, cleaning the contacts with electrical contact cleaner. Problem could also be something wrong with the fuel pump.

Where is the ignition relay located?

The starter relay is most often located under the car hood, found in the power distribution center. It can also be located in the fuse block in the cabin.

How to replace circuit opening relay in Toyota Tacoma?

(1) Disconnect the fuel pump connector. (2) Check the resistance. (3) Reconnect the fuel pump connector. (a) Remove the circuit opening relay from the engine room R/B. (b) Remove the fuel pump relay from the engine room R/B. (c) Check the resistance. (d) Reinstall the circuit opening relay.

What are the components of a Toyota starter relay?

The key components are: The starter-side relay. The ignition-side relay. The fuel pump. The earth signal provided either by the ECU or AFM. The 12v sources from the starter and ignition circuits. For quick reference, here are the pins for a standard relay. You can remember them as BETA, lowest to highest (taught to me by a fellow Toymodder).

How can I tell if my relay is open or closed?

Simply power up the primary circuit with the battery, and then check the secondary circuit to see if it’s open or closed. The primary circuit is the ‘side’ with the smaller terminal pins or wires, and it is the control side, powered by a low current circuit.

Which is the active pin on a Toyota relay?

87 = A = ACTIVE (12v flows to this pin from pin 30 when the relay energises) (The above is for a four-pin relay. For a five-pin, there will be another pin, 87A, which will be connected to pin 30, thus receiving 12v, when the relay is NOT energised).