This is the second ECU this has happened to me with. The original ECU started this and gradually got to the point that the car was not able to be started. I purchased a replacement ECU and had no issues for something like 5 years (of course there was a lot of troubleshooting before buying a replacement ECU).

Recently the car started running badly, super rich. It was the ECU (again lots of troubleshooting). I purchased another ECU and problem solved. About 2 months after installing the ECU I started having the delay in fuel pump prime again.

I have already printed out the ground diagrams and will go through each of those as I know that could still be a possibility. If that doesn’t fix it then I would like to see if anyone has a schematic for the P06-A02 ECU. I now have three of them. All that is wrong with the original is the startup initiation where it primes the fuel pump. I have heard these ECUs have issues with the capacitors so if I had a schematic I am fairly certain I could repair the ECU.

Can someone get me a schematic for this ECU? I have search all over for one. Thanks.

 

have you checked the main relay? i had trouble starting my honda every once in a while. redid the solder joints on the main relay and all is good. although from what you've been through so far i figured you would have troubleshooted that option out already

 

Have you verified that no sensor connectors are swapped?

Otherwise, seems like some bad luck and the fact that the ECUs for your car are now 20+ years old.

 

Did you look through this thread?

or this thread

or this thread

or this thread

 

Not yet this time. The first time this happened I went as far as to put jumper wires in so the fuel pump and ignition were on constant as soon as the key was turned. The car still wouldn't start until that initial sequence completed in the ECU. Then everything was fine. Exact same symptoms this time just have not dug into it yet (just replaced a head on my Duramax so need a little break haha).

Not sure how sensor connectors would have gotten swapped. The last thing I did was replace the ECU and everything was fine for a while. I would think I would be getting the CEL if connectors were swapped. This fault produces no codes.

I think you are right. These cars are getting old!

Thanks for the info. The first thread appears like it used to have good information but has been edited and removed. The second one is close to my issue but the car will run if the fuel pump is manually powered. Mine will not run if the fuel pump is manually powered.

What I would really like is a schematic of the computer.

 

Doesn't exist.

 

Not always^

Checking for swapped sensor connectors is pretty easy and could potentially solve the problem.

If there are no swapped connectors, I recommend that you next short test also sensor inputs to the ECU.

 

Thats kind of what I figured. O well. When I get time I will have to sit down with one and figure it out the hard way. Looks like plently of good help in one of those threads posted too.