How Do You Know If Your Main Relay Is Bad On A Honda Civic вђ Latest Cars 3. your vehicle won’t stay running. if you have a bad main relay, you won’t be able to keep your car running for long even if you are able to get it started. whether this is a matter of seconds or minutes depends on the specific fault, but you’re not going to keep your engine running with a bad main relay. if your engine is running and. Consult your owner's manual or vehicle repair manual and remove the main relay. attach the battery positive terminal to the no. 4 terminal and the battery negative terminal to the no. 8 terminal of the main relay. then check for continuity, using a circuit tester or multimeter, between the no. 5 terminal and no. 7 terminal of the main relay.
How Do You Know If Your Main Relay Is Bad On A Honda Civic вђ Latest Cars The engine will shake and vibrate, and it may even stall outright. engine stalling. if your honda engine suddenly starts stalling, it might be a sign that the main relay is going bad. the main relay is responsible for supplying power to the engine's control unit, and if it fails, the engine will lose power and stall. A bad main relay can cause problems like a no start condition, unreliable vehicle ignition, an engine that won’t stay running, and an illuminated check engine light. relays are electronically controlled switches. they connect or break paths in a circuit to control electric currents and their respective devices. The main relay helps to ensure that the engine computer gets the power that it needs to run and function as intended. the main relay is usually located underneath the hood in the relay box. the high heat that this relay is exposed to can create a lot of damage over time. when the main relay begins to malfunction, you will have to find a way to. 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. now check for continuity between pin 5 and pin 4 of the pgm fi relay. if your relay has zero continuity in this test, it will need a replacement, if there is continuity, go to the next step. 2.
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