Its a 10 amp fuse underhood that according to the cover is an ECU fuse, the fuse above it is a 15 amp for the condensor fan, and the one I think you are referring to is on the end a 7.5 amp that is labeled radio(backup) that 10 amp labeled ECu is the one blowing

from my vantage point Im looking at the fuse box from the front of the car, so that 7.5 amp fuse is on the extreme top right, and the 10 amp ECU that keeps blowing is over to the left one and down one.

 

If that is the case, it is fuse #28 (10 amp) and is for the Main Fuel Relay. That fuse is for the yel/blu wire that goes to MFR.

 

You are not replacing ECU fuse but fuse to the Main Fuel Relay. Probably MFR is faulty and causing internal short.

A service manual of some type would have preventedmost of your headache.

good luck

 

alrighty that helps, but curious, the 7.5 amp fuse was out for a time and the car still ran, just the radio had no power. why is that 10 amp fuse labeled ECU if its actually powering the main relay, which by the way is only a few months old itself.

 

Probably some Japanese-English translation error. The wiring diagram labels it PGM-FI (ProGrammable Fuel Injection) fuse.

Car is designed to run even if ECU is dead, in "limp-home" mode. There is a alternate circuit which somehow fires the injectors in correct sequence. Ignition doesn't depend on ECU.

good luck

 

guys you are totally cool, thanks for the help, I'll try replacing the main relay again and see if that does any good. and will keep you updated.

 

so is it safe to say getting a new main relay should fix the problem?

 

PAHonda says it may be keyswitch, but at least you know what circuit to check.

An intermittent short is very difficult to find. Relay probably costs as much as the keyswitch assy. Since the MFR is relatively new, the keyswitch may be more likely.

good luck

 

I tried something today to see if it was the main relay. I put the Old Mitsuba back in since its relatively cool here, the car seems to be running fine, and have not had anymore symptoms, will keep you guys updated. BTW the replacement MFU that I bought was a BWD automotive part.

 

All the relays I've installed were always Mitsuba relays. Can't say that I'm impressed w/ their quality as they fail far too frequently.

Relay can sometimes be repaired by resoldering the solder jts, but this doesn't always work.

Glad to hear your problem resolved.

good luck