The fault code related to a Relay 'Circuit 87' (Engine) indicates an issue with the electrical circuit for the relay that controls a specific function in the engine.

The fault code related to a Relay 'Circuit 87' (Engine) indicates an issue with the electrical circuit for the relay that controls a specific function in the engine. The circuit 87 is typically the output circuit for the relay that controls power to the device, such as an engine component or a group of components.

To address this issue, you will need to first determine which specific relay circuit 87 is causing the fault code. This can be done by consulting the service manual for your vehicle or by using an OBD-II scanner that can provide more detailed information about the fault.

Once you have identified the specific relay circuit 87 causing the issue, here are some general steps that may help you address the issue:

1. Inspect the wiring: Check the wiring for the relay and the device it controls to ensure that there are no damaged or corroded wires. If you find any damaged wires, replace them as needed.

2. Check the relay: The relay itself may be faulty, preventing it from providing power to the device it controls. You can test the relay with a multimeter or by swapping it with a known good relay to see if the issue is resolved.

3. Check the device: The device that the relay controls may be faulty, preventing it from receiving power. Check the device for any visible damage or wear and test it with a multimeter or other diagnostic tool.

4. Check the fuse: The circuit that the relay controls may have a blown fuse, preventing the relay from providing power. Check the fuse for the affected circuit and replace it if necessary.

5. Repair or replace the affected component: If the wiring, relay, device, or fuse are found to be faulty, repair or replace the affected component as needed.

Note: These are general steps and the process of addressing a Relay 'Circuit 87' (Engine) fault code may vary depending on the make and model of your vehicle. If you are not comfortable performing this repair on your own, it is recommended to take your vehicle to a certified mechanic or dealership for professional repair.

The Relay 'Circuit 87' (Engine) fault code is related to an issue with the electrical circuit for the relay that controls a specific function in the engine. Depending on the specific make and model of your vehicle and the component that is controlled by the relay, replacing the relay may be a relatively simple task. Here are some general steps for replacing a faulty relay:

1. Locate the relay: The relay may be located in the engine bay, the fuse box, or another location in the vehicle. Check your vehicle's owner's manual or service manual to determine the exact location.

2. Remove the old relay: The relay is usually held in place with a retaining clip or bracket. Use a screwdriver or pliers to remove the fasteners and carefully remove the old relay from its mounting location.

3. Install the new relay: Install the new relay in the same location where the old one was removed. Make sure it is secured properly with the retaining clip or bracket.

4. Test the new relay: Once the new relay is installed, test the component it controls to make sure it is receiving power. Start the engine and listen for any abnormal sounds or check the appropriate gauge or display to verify that the component is operating as expected.

Note: These are general steps and the process of replacing a relay may vary depending on the make and model of your vehicle and the component that is controlled by the relay. If you are not comfortable performing this repair on your own, it is recommended to take your vehicle to a certified mechanic or dealership for professional repair.