Typically, the main relay on a Honda Accord rests behind the dashboard to the right or left of the steering while with accessibility up under the dashboard or behind the steering column access or dash panel.

It makes it look like the relay is mounted on the left-hand side of the steering wheel, when in fact it is located as it states–to the right of the column, almost directly behind the gas gauge. Using a flashlight made the world of difference.

The PGM-Fl main relay actually contains two individual relays. This relay is located at the left side (LHD) or right side (RHD) of the cowl. One relay is energized whenever the ignition is on which supplies the battery voltage to the ECM, power to the fuel injectors, and power for the second relay.

The main relay is located just right above the hood release, inside the dash panel bolted to the left kick panel with a bolt that will fit a 10 mm socket. It has seven wires from the connector.

The relay works as a conductor in between a low amperage circuit, allowing it to turn a higher amperage circuit on or off. The main relay in a vehicle controls the fuel pump and supplies power to the injectors.

1. To test your Honda Main Relay, first connect Pin 2 terminal on your relay to the positive terminal on your battery and the negative to Pin 1 terminal.
2. Connect your positive terminal to Pin 5 of your relay and the negative terminal to Pin 3 of your relay.

Relay Safety The wrong relay can cause a short or a power surge that can damage your vehicle’s electrical system. Handle the relay gingerly and try to avoid dropping it. If the relay is damaged internally, it can cause burning or melting of wiring. Also avoid modifying the relay in any way.

A relay can be checked with a jump cable, a voltimeter, an ohmimeter or a test light. If the voltage is not present, the relay coil is defective. …

And no, a bad main relay on your vehicle will not cause a no spark condition.

There are a few reasons for no spark, new coil pack could be defective, crank sensor, ignition module or bad wire in primary circuit, faulty ECM/PCM. You may have to have a good technician have a look, diagnose and estimate repair. Second link gives detailed instructions for testing and diagnosing coil pack.

The No Spark Problem May Also Be Due To Any Of The Following:

• A Bad Crankshaft Position (CKP) Sensor.
• A Bad Ignition Module.
• A Bad Pickup Inside The Distributor, A Stripped Distributor Drive Gear, Broken, Loose Or Corroded Wires From The Pickup To The Ignition Module Or PCM.
• A Bad Ignition Coil.