Replaced the EBCM, now car wont start

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04-04-2011, 11:32 PM

#21

Redeasysport

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St. Jude Donor '05-'06

FYI here is his car for reference
http://forums.corvetteforum.com/c5-c...tron-blue.html

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04-04-2011, 11:33 PM

#22

bsalie99

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Bill Is there a write up in what I should be checking and what the correct voltages are?

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04-04-2011, 11:40 PM

#23

lucky131969

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Quote:

Originally Posted by bsalie99

I pulled the codes when i got the car and got
P1571
C1248
C1254
U1040
and a code for the outside air temp B0333
Brandon at ABSfixer said it was the EBCM that was fried and that he could not fix those codes
So I got a New EBCM from a dealer swaped it in and now get no comms

Here's the bad news. A C1254 will cause what you are seeing, as when it sets, the EBCM will not communicate on the class 2 serial buss. In conjunction with the C1254, a C1248 will set also. Like Bill said, time to get out the meter, and go through the 12 volt and ground checks, at the connector. Kinda looks like you have a bad harness/plug....maybe.

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04-04-2011, 11:42 PM

#24

lucky131969

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04-04-2011, 11:44 PM

#25

madmatt9471

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Quote:

Originally Posted by bsalie99

Where is the old one at?

Can you swap it back in and see if it gives you "NO COMM" for the old one as well?

That would also help as a test! But like Bill said you now need to check the actual power supply wires to see if you have "ACTUAL" voltage!

Thanks,Matt

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04-04-2011, 11:50 PM

#26

lucky131969

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Quote:

Originally Posted by madmatt9471

Where is the old one at?

Can you swap it back in and see if it gives you "NO COMM" for the old one as well?

.....why didn't I think of that...

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04-04-2011, 11:55 PM

#27

madmatt9471

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Quote:

Originally Posted by lucky131969

.....why didn't I think of that...

I think it is because I had my wisdom teeth pulled saturday and I still on meds - other than that we'd have him pull the motor and send it to us

Thanks,Matt

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04-04-2011, 11:59 PM

#28

lucky131969

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Quote:

Originally Posted by madmatt9471

I think it is because I had my wisdom teeth pulled saturday and I still on meds - other than that we'd have him pull the motor and send it to us

Thanks,Matt

I was being facetious......I mentioned it 15 post ago.......

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04-05-2011, 08:22 AM

#29

bsalie99

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Do I have to reinstall the old one to test it or just plug it in?

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04-05-2011, 08:32 AM

#30

lucky131969

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Quote:

Originally Posted by bsalie99

Do I have to reinstall the old one to test it or just plug it in?

What is the outcome of the 12volt/ground checks?

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04-05-2011, 10:11 AM

#31

madmatt9471

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Quote:

Originally Posted by lucky131969

What is the outcome of the 12volt/ground checks?

need to check these!

Quote:

Originally Posted by bsalie99

Do I have to reinstall the old one to test it or just plug it in?

It is best to install it like you would if it is new and you are ready to drive - one ground source comes from the ABS unit itself!

Thanks,Matt

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04-05-2011, 10:49 AM

#32

dougbfresh

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Just unplug the harness, the car can run without the EBCM, at least you'll know the car starts again then you can try troubleshooting.

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04-05-2011, 11:51 AM

#33

MG RED 99

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Quote:

Originally Posted by dougbfresh

Just unplug the harness, the car can run without the EBCM, at least you'll know the car starts again then you can try troubleshooting.

OP already said in previous post that he replaced the battery and car now starts

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04-05-2011, 04:21 PM

#34

bsalie99

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I am headed off to Hawaii for 2 weeks, then I will have to dive back into this issue. I have not had time to do the voltage checks with all the last minute stuff for the trip
Thanks for the help, I will revive this when I return

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