If your Accord won't start, then you may have a damaged or broken main relay. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. It is a fuel pump working. One relay is energized whenever the ignition is on. I'm looking for info on the main engine relay.
Symptoms of cracked solder include motor overheating or a relay that feels hot when touched. When the main relay goes bad, and there isn't any voltage at the injectors, it will set a code 16 computer message for an injector, because the computer doesn't read voltage on the ground side of the injector. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises. Honda Accord Main Relay The can cause you major head aches when it goes bad. If there is no continuity, replace the relay and retest. When the light goes out, you should hear the main relay click. You should hear the fuel pump run during the two seconds.
It supplies power to the fuel pump. It is a main relay click. When this happens, the engine will crank over because the starting circuit is still good, but the Idle Air Control Valve, Fuel Injectors and Fuel Pump will not have battery voltage because of this bad Main Relay. If there is no continuity, replace the relay and retest. This will obviously prevent your Engine from getting fuel in your Honda Accord and will result in your no start condition. Before you dive in too fast, it's also possible that the car has more than one thing causing a hard start. May 08, 2011 I suspect the at this point, the main relay is defective.
Now, imagine a line running from the passenger seat back, through your knee, and ending on the side of the car. It can leave you high and dry at the most inconvenient time or place. I wait a while then it starts no problem. Want even more diagnostic training? For example, your Honda Accord starts great in the morning, drive around town, stop a the grocery store or the gas station and the vehicle no longer starts up after a hot soak. Then check that there is continuity between the No. There's nothing worse than replacing an expensive electrical part only to find that it wasn't the problem in the first place. But when an igniter or a coil fails, the car won't start at all until it cools down.
Check for continuity between relay terminals No. When it goes bad, one of the main solder joints inside the relay gets old and deteriorates and prevents contact which will not allow power to travel through the Main Relay out to vital components under the hood which will prevent your Honda Accord from starting. If continuity exists, go to next step. If you do hear a click, you car will start. This relay also supplies voltage to the fuel injectors, and power to the second relay. Although the problem is the same, different Honda models have different symptoms if the main relay is bad. Using another jumper wire, connect battery ground to relay terminal No.
Check for continuity between relay terminals No. Often a relay stops working because a soldered joint has cracked causing resistance in the relay and a voltage drop. If there is continuity, the relay is just fine. The check engine light will come on for two seconds and go out. Then check that there is continuity between the No. You can do it yourself by following some simple steps. The relay is held in place with one 10mm bolt and the electrical connector.
The 2002 Honda Civic was just a year removed from a total redesign. These parts are vital to ensure proper electrical function—not to mention safety—in a vehicle. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! If you've determined that the culprit could be the main relay, you should do a to be sure. Some are located to the right of the column. To get to it you have got to lay on your back in the driver's footwell, and look up under the dashboard. Automobile designers regulate high current devices or systems, such as the starter or fuel system, with a smaller amount of current controlled through a series of relays or switches.
If the main relay bad on a Civic, you will lose power to the injectors and the fuel pump, but you may not lose fuel pressure since thecan't open without power. In a place you ain't gonna believe. I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. From time to time, vehicles can experience a wide range of electrical issues—even those that are reliable, like Hondas. If continuity does not exist, replace relay and retest. I'm having difficulty starting my car sometimes. Also, keep in mind that your new relay must fit snugly within the socket as a loose relay can overheat or cause melting of the outer casing when current runs through it.
Disconnect the battery and find the main relay. Posted on Oct 20, 2009 Check your main fuel relay. Keep in mind that the socket attaches to the relay via a tab that locks the relay to the socket. This Main relay is very easy to replace yourself. . One of those problems can involve the main relay.
Pull the main relay from its location. Replacing the fuel pump relay is tricky, as Honda tucked it behind the glove box. If there is continuity, go on to Step 4. The main relay in a vehicle controls the and supplies power to the injectors. Then check that there is continuity between the No.