How to identify a bad main relay on a Honda?
How to identify a bad main relay on a Honda (PGM-FI) Other symptoms include: stalling, long crank times, surging, bucking, poor transmission shifting. Some quick work with the test light allowed me to zero in on a PGM-FI main relay issue, which was confirmed by a visual inspection on the relay board itself.
What is a relay and how does it work?
What is a Relay and How Does it Work? A relay is an electrically operated switch. They commonly use an electromagnet (coil) to operate their internal mechanical switching mechanism (contacts). When a relay contact is open, this will switch power ON for a circuit when the coil is activated.
What kind of rating does a relay have?
Basic relays feature electrical ratings for both the coil and the internal switching contacts. The coil voltage rating is the voltage required for the coil to operate correctly. The switching circuit of the relay also features a voltage and ampere rating. This is the maximum rating of the switch contacts and should NOT be exceeded.
Which is an example of an open relay?
Example 1. 4 pin (normally open) relay with the switch on the positive side of the control circuit. Example 2. 4 pin (normally open) relay with the switch on the negative side of the control circuit. Note: These circuits have been simplified to illustrate the function of a relay and therefore exclude fuse protection that would be required.
How can I tell if my main relay is working?
To check if the relay is working on all stages of the key, place your hand on the relay and turn the key over one step. You should hear a click. This will only unlock the ignition. Turning the key further should turn on the electrical systems. The relay should give another click at this stage.
Which is the main relay on a car?
Average rating from 130,908 customers who received a Vehicle Engine Electrical Inspection. The electronic control relay, also known as the “main” relay, is one of the various electronic relays found on modern vehicles.
When do you need to replace the electronic control relay?
If your engine cranks but does not start or powers on but does not function, you may need to replace the electronic control relay. Average rating from 130,908 customers who received a Vehicle Engine Electrical Inspection. The electronic control relay, also known as the “main” relay, is one of the various electronic relays found on modern vehicles.
Can a bad main relay keep an engine running?
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 stays that way, whatever problem you’re experiencing isn’t related to the main relay.