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Both ECU fuses blowing, & won't start.

 
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Old 06-25-2013, 10:27 PM
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Icon9 Both ECU fuses blowing, & won't start.

1995 Prelude believed to be an original H22 swapped to a F20b. Bought it already swapped after they wrecked the front end.

So I've run into a headache with both of my ECU 15a fuses blowing under the dash in that fuse box.. The car has power and cranks all day, but won't start. There is a CEL code 0 (Check engine light stays solid/no flashes).

YES, I've tried replacing the fuse. And have quite the collection of blown 15a's..
I've tried a different known WORKING ECU in, and still no start.
Checked a lot of components and harness for bad wires under the hood, and inside. Nothing visible so far.
I have the distributor off right now since I read it could possibly be the ICM inside. Hope to test a different distributor in it tomorrow.

But if any one has any other ideas, I would greatly appreciate it.. I'm trying to sell the car before I move out of state.. And I don't want any issues to why I can't sell it on time.. Thanks everyone.
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Old 06-26-2013, 04:09 AM
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Re: Both ECU fuses blowing, & won't start.

code 0 is faulty ecu. is the ecu for an f20b or h22? what about the known "good" ecu?
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Old 06-26-2013, 08:23 AM
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Re: Both ECU fuses blowing, & won't start.

Pull the wiring diagram and check for shorts if you changed the ECU and have the same symptoms.
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Old 06-26-2013, 10:35 PM
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Re: Both ECU fuses blowing, & won't start.

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Originally Posted by AccidentalPrelude View Post
code 0 is faulty ecu. is the ecu for an f20b or h22? what about the known "good" ecu?
Yeah, I'm aware code 0 is the ECU. I'm just not sure why it still displayed with a different ECU in. The ECU that came with the car is a P28 chipped and tuned for the F20b. It ran fine and everything for several years, so the ECU is fine for this engine. The Known working ECU that we tested later was a P13 I believe. Some ECU's will still run a car, you'll just be missing certain features like VTEC.

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Originally Posted by Qluder View Post
Pull the wiring diagram and check for shorts if you changed the ECU and have the same symptoms.
Yeah, I've been looking for exposed wiring everywhere. I'm not sure how to find a short other than an exposed wire touching metal or getting wet..



Does anyone know if code 0 is strictly ECU failure/wire harness to ECU exposed, or can a sensor or different part throw the code as well?

I appreciate the feedback everyone.
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1st: (93 Prelude) F22a1 to H23a JDM Blue Top - STOLEN
2nd: (95 Prelude) F20b - SOLD
3rd: (99 Civic, what a mistake) D16y8 - SOLD
4th: (94 Prelude) H23a1 to ?????? - CURRENT
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Old 06-27-2013, 12:56 PM
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Re: Both ECU fuses blowing, & won't start.

Disconnect your battery and replace your blown fuses. Use the wiring diagram for reference and perform resistance checks on the ECU circuit between power and ground.

A short can exist just about anywhere so once you isolate an area, you may need to take things apart. A good place to check would be in the connections to the ECU. I have seen connections appear fine but short when connected from improperly seated or bent pins. The key here is to isolate the short! From what was stated it seems that your ECU is probably OK.

Good luck and let us know what you find.
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Old 06-27-2013, 02:28 PM
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Re: Both ECU fuses blowing, & won't start.

Quote:
Originally Posted by Qluder View Post
Disconnect your battery and replace your blown fuses. Use the wiring diagram for reference and perform resistance checks on the ECU circuit between power and ground.

A short can exist just about anywhere so once you isolate an area, you may need to take things apart. A good place to check would be in the connections to the ECU. I have seen connections appear fine but short when connected from improperly seated or bent pins. The key here is to isolate the short! From what was stated it seems that your ECU is probably OK.

Good luck and let us know what you find.

Alright, sounds logical enough. Just set the meter to ohms, touch the black connector to a ground, and then the red connector to each pin in the ECU wire harness, right? Each wire should read 0, unless there's a short. Then follow the wire that doesn't read 0, if there is one. I hope I'm understanding this right.

Thanks Qluder. I'll get back to you once I check it out.
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1st: (93 Prelude) F22a1 to H23a JDM Blue Top - STOLEN
2nd: (95 Prelude) F20b - SOLD
3rd: (99 Civic, what a mistake) D16y8 - SOLD
4th: (94 Prelude) H23a1 to ?????? - CURRENT
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Old 06-27-2013, 03:11 PM
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Re: Both ECU fuses blowing, & won't start.

Well, that got cut short.. Was a hot sunny day, and then rain clouds come out of no where.. Gotta love Florida... Anyway, I did check a few pins. And some read 0, and then several yellow wires and others read ".XXX" numbers, or would read "1" instead of changing to 0.. so I'm not sure how true this may be. I was expecting more 0's..

I got this idea off another forum for a civic which was having the same problem.. I'll try this next chance as well..

***(Does unplugging the main relay, ECU, IACV, fuel injectors, EVAP purge solenoid valve, or O2 sensor prevent the fuse from blowing? Test each one at a time.)***
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1st: (93 Prelude) F22a1 to H23a JDM Blue Top - STOLEN
2nd: (95 Prelude) F20b - SOLD
3rd: (99 Civic, what a mistake) D16y8 - SOLD
4th: (94 Prelude) H23a1 to ?????? - CURRENT
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Old 06-27-2013, 06:17 PM
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Re: Both ECU fuses blowing, & won't start.

*****UPDATE*****PROBLEM SOLVED*****

Recently I put a new brake booster in, due to stalling when I'd come to a stop from hitting the brakes. So I had to remove the top part of the intake manifold to remove the brake booster, and after I put everything back in, I didn't nottice that the wires going to the EVAP plug were pinched under the intake after I re-installed it.. So I took the intake manifold back off, found some squished and exposed wires along the way, gave them a band aid, and walah.. Car starts. :D

But now it's revving around 3k rpm probably due to the intake manifold gasket needing to be replaced now. And I'm getting some smoke from my power steering and alternator area.. It's been sitting for about a month due to rainy day after rainy day, and un-awareness of what the problem was.. I don't think an alternator would go bad from just sitting, or would it? O.o
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1st: (93 Prelude) F22a1 to H23a JDM Blue Top - STOLEN
2nd: (95 Prelude) F20b - SOLD
3rd: (99 Civic, what a mistake) D16y8 - SOLD
4th: (94 Prelude) H23a1 to ?????? - CURRENT
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Old 06-28-2013, 12:15 AM
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Re: Both ECU fuses blowing, & won't start.

Random question, how much was your brake booster, and where did you get it from?
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that wasn't an earthquake, that was tedd's mom throwing a fit because she was out of twinkies.
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Old 06-28-2013, 02:06 AM
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Re: Both ECU fuses blowing, & won't start.

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Originally Posted by mizlude View Post
Random question, how much was your brake booster, and where did you get it from?
I got it from a Salvage yard for $20. I go there often so they give me pretty good deals. But it's always worth negotiating for parts.
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1st: (93 Prelude) F22a1 to H23a JDM Blue Top - STOLEN
2nd: (95 Prelude) F20b - SOLD
3rd: (99 Civic, what a mistake) D16y8 - SOLD
4th: (94 Prelude) H23a1 to ?????? - CURRENT
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in soviet Russia, prelude hates you
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Old 06-28-2013, 04:39 PM
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Re: Both ECU fuses blowing, & won't start.

Oh I got ya, I know they are crazy priced at the parts store. So I had to ask.
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that wasn't an earthquake, that was tedd's mom throwing a fit because she was out of twinkies.
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