Solid CEL Light?

[Josh26]

yes i know it could be a bad ecu but its not i've just purchased another new p13.....the car wont start it has no spark...could this be my main relay or what? im stumped and have no idea. someone help please.

[cp[mike]]

yes it could be the main relay, as it powers not only the fuel pump, but also the fuel injectors and one of the pins on the ecu...

[Josh26]

any ideas what i could check or do?

[NAiL05]

yes it could be the main relay, as it powers not only the fuel pump, but also the fuel injectors and one of the pins on the ecu...

I thought the main relay controlled fuel pump only in accords? Only the civics/tegs had that dunno.

[cp[mike]]

I thought the main relay controlled fuel pump only in accords? Only the civics/tegs had that dunno.

main relay is a double relay... first relay powers the injectors, ecu, and second relay... the second relay powers the fuel pump

[NAiL05]

Interesting interesting. Im gonna have to look into that more now.

[Josh26]

OK i got my main relay out anyways to tell if its bad or not?

[cp[mike]]

OK i got my main relay out anyways to tell if its bad or not?

open it up and see if there are any cracks on the solder joints... instead of being a smooth joint youll see crack ring thru the solder around the pin... use a soldering iron to resolder all the joints.

http://www.cb7tuner.com/vbb/showthread.php?t=53888

go search-advanced search and search titles only for "main relay" and youll get a LOAD of results

[accord91lx]

also check all your ecu fuses and grounds... solid cel i've found to mean that the ecu isnt getting power from everywhere it expects...

[Josh26]

open it up and see if there are any cracks on the solder joints... instead of being a smooth joint youll see crack ring thru the solder around the pin... use a soldering iron to resolder all the joints.

http://www.cb7tuner.com/vbb/showthread.php?t=53888

go search-advanced search and search titles only for "main relay" and youll get a LOAD of results

thanks alot mike....i see around some of my solders that there are some cracked rings about 3-4 have them so ima just go buy a new one. lets hope this fix's the problem i'll let you all know by tonight.

[Josh26]

thanks alot mike....i see around some of my solders that there are some cracked rings about 3-4 have them so ima just go buy a new one. lets hope this fix's the problem i'll let you all know by tonight.

ok i took the main relay out of my 91 ex coupe and put it in my car thats having the problems...so now im back to square one any ideas now?

[GhostAccord]

Have you looked into testing your ignitor as a possible cause of problem? Everyone always jumps all over the main relay but the ignitor is just as common a problem in these cars.

When you turn the key forward do you hear the fuel pump?
Have you checked all the power and ground wires to the ECU?
Make sure you check of the all ground wires on the car

[Josh26]

Have you looked into testing your ignitor as a possible cause of problem? Everyone always jumps all over the main relay but the ignitor is just as common a problem in these cars.

When you turn the key forward do you hear the fuel pump?
Have you checked all the power and ground wires to the ECU?
Make sure you check of the all ground wires on the car

can you even hear a fuel pump on an accord since ints in the tank? when it worked i never ever heard my fuel pump befor. But say bad ignigtor thats gonna give me a check engine light?

[GhostAccord]

Well you already know what a solid CEL means. But your telling us that it's not the ECU. Here is the actual ECU test procedure. It could have to do with your fuel pump. There is too much for me to write out so here are some images.

[SSMAccord]

can you even hear a fuel pump on an accord since ints in the tank? when it worked i never ever heard my fuel pump befor.

If you put the rear seat down and are fairly close to the fuel pump havea friend turn the key to the on position, you should be able to hear a whirring kind of noise. If it doesnt make noise, then it isnt being activated or is defective. But, if you dont have anyone to help you, just lay the seat down and turn the key to on, if the pump turns on it kinda sounds like the noise of a cellphone on vibration alert.

Or you could relieve the pressure in the fuel system at the fuel rail and turn the car on and then re-check the pressure to see if the system repressurizes.