03 cobra Engine ECU not responding.

[Project_termin8er]

I’m having same issues the only thing I have different is I couldn’t get the ground to the driver side behind the oil filter. I added one of these could this cause this

03 cobra Engine ECU not responding.

Hey guys, Ok so last week I put a new engine in my brothers 03 cobra and the car hasn't ran in over 6 years. So I pretty much finish everything up on the engine install, I know I'm missing a couple things. I got in the car to turn everything on and I was greeted with a flashing THEFT LIGHT...

www.svtperformance.com

 

[CobraVenom01]

I’m having same issues the only thing I have different is I couldn’t get the ground to the driver side behind the oil filter. I added one of these could this cause this

You’re probably gonna get a slap on the wrist for bumping a 5 year old thread lol anyway

Check all your grounds, the grounds behind both headlights, battery to chassis, and engine to chassis.

If the #26 fuse under the hood isn’t blow (30 amp) and your grounds are ok, check the CCRM in the passenger fender. There is a several relays in there one of which is for the ECU.

I just went through this with my buddies car and it was the CCRM.

Why did you add that ground block? Get rid of that and run a 0 gauge ground from the engine block to the chassis and from the battery to the stud on the upper alternator bracket.

You can leave the stock engine ground intact. There are a few empty threaded holes on the block that you can put a bolt in and run a new wire right to chassis.


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[03cobra#694]

You’re probably gonna get a slap on the wrist for bumping a 5 year old thread

This has been happening so much lately it's crazy. I had one the other day from 2005.

 

[Project_termin8er]

You’re probably gonna get a slap on the wrist for bumping a 5 year old thread lol anyway

Check all your grounds, the grounds behind both headlights, battery to chassis, and engine to chassis.

If the #26 fuse under the hood isn’t blow (30 amp) and your grounds are ok, check the CCRM in the passenger fender. There is a several relays in there one of which is for the ECU.

I just went through this with my buddies car and it was the CCRM.

Why did you add that ground block? Get rid of that and run a 0 gauge ground from the engine block to the chassis and from the battery to the stud on the upper alternator bracket.

You can leave the stock engine ground intact. There are a few empty threaded holes on the block that you can put a bolt in and run a new wire right to chassis.


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Thank you my bad I’m new to this to be honest I appreciate the help . I’m going to add it now and see how it goes . Thanks again

 

[CobraVenom01]

Thank you my bad I’m new to this to be honest I appreciate the help . I’m going to add it now and see how it goes . Thanks again

Let us know how it turns out. If your fuses and grounds are good my money is on the CCRM. How long has the car been sitting?


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[Project_termin8er]

Let us know how it turns out. If your fuses and grounds are good my money is on the CCRM. How long has the car been sitting?


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The I checked all fuses and everything is good I got a new ccrm and still nothing checked all grounds . Solid so now I just bought a ecu I’m gana try that I went over it with a good friend of mine and he said that next thing would be the ecu . If had it down for about 3 months but while the battery was on for the alarm I droped a rench on the battery bd shielrted it out . I’ve taking the engine out 3 time nothing ever happens before until now after that little accident with the rench

 

[Project_termin8er]

Just wanted to stop by and say thanks for the help I figured it out it wasn’t the computer or grounds basically I connected 2 connections from the fan to the wrong connection. Dont remember what it was used for but there the only ones that look alike on the passenger side . Had a friend come by and he found it in like 5 min . Basically the buzzing sound coming from the fan was the cause of the wrong connection putting the computer into limp or safe mode . That’s what was explained to me . So now I have -
ignition switch with keys
-alarm theft system ,
-cluster
-ECU with 29k miles
-little connections that go to the switch I don’t know what there called
For. 1k that’s how much I paid
If anyone needs it let me know
415-410-1876
location in ca

 

[CobraVenom01]

Just wanted to stop by and say thanks for the help I figured it out it wasn’t the computer or grounds basically I connected 2 connections from the fan to the wrong connection. Dont remember what it was used for but there the only ones that look alike on the passenger side . Had a friend come by and he found it in like 5 min . Basically the buzzing sound coming from the fan was the cause of the wrong connection putting the computer into limp or safe mode . That’s what was explained to me . So now I have -
ignition switch with keys
-alarm theft system ,
-cluster
-ECU with 29k miles
-little connections that go to the switch I don’t know what there called
For. 1k that’s how much I paid
If anyone needs it let me know
415-410-1876
location in ca

Glad it’s sorted and thank you for following up in the thread. So many times resolutions don’t get posted. Enjoy the car
-Ryan


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