So I had just installed a CBE on my car the other day at my cousin's house. Everything went well with that.

However, my cousin wanted to try out his new OBD-II scanner on my car. He plugged it in and it showed three codes. One for MAS, one for IAT, and one for barometric pressure being low (I don't know the exact codes off hand). He decided to clear the codes and after that the car would not start. It turns on, it cranks, but it does not start.

Upon further investigation we checked and saw that the engine control fuse was blown. After replacing it with a new one and trying to start the car again the fuse blew again. My cousin also has another OBD-II scanner and both that and his new one were not recognizing the ECM.

One other thing we did was disconnect the ECM put a new fuse in and turned the car ON. This fuse did not blow. We plugged the ECM back in and turned the car ON and the fuse blew this time. Does this mean my ECM is fried?

Any ideas on what is going on? Any kind of help is greatly appreciated! TIA!

 

Sounds like you have a short and the ecm is bridging the connections. Its hard to say exactly what happened without investigation like pushed out pins on the odbII port, etc.

 

I'd make sure the O2 sensor on your CBE is not rubbing on the frame. It will ground out and blow the engine control fuse.

Hope this helps...

 

We checked that and they seem fine.

Well, the O2 sensor was left untouched. I have a IX so the sensor is on the cat.


Any other help? TIA.

 

It has to be either grounding out or getting a large voltage spike, since it never starts i'll assume that its grounding out.

You wash the engine bay by chance? water log the fusebox....

Also I'd check all your o2 wires even if your sure they aren't the problem for contact against the exhaust or worn insulation.

Lastly if you have someone brave enough to lend you their ecm to test out your theory you can eliminate the ecm from the problem's list...

 

Sounds like somethign else is going on with this car since it already had 3 codes in the ECM before the car wouldnt start.

 

I had this problem with my Eclipse... what was happening was my pos battery connector was loose (I don't know how it was related). I put a new one on, and that solved the problem. Check that connection. Other than that, check for ground outs like stated.

 

Just to clarify, this problem did not start until the stored codes were removed from the ECM. Could that mere act have anything to do with it? I've been told it may be possible to fry the ECM by just doing that.

So after the CBE was installed, the car was started to test it out but was turned off after we found an exahust leak b/w the mid-pipe and cat. So I tightened it, the codes were removed, and the car did not start after that.

 

These stored codes may be from when I installed my MBC. When I removed the airbox, I disconnected the MAF sensor. When I put everything back together and started the car the SES light come on. I soon found that I did not plug the MAF sensor all the way in. I plugged it back in properly and started the car after and the SES light eventually went away. This was done about 3 weeks ago and the car ran fine.

 

If the fuses didn't blow I'd have leaned more toward an ecm problem like somehow erasing your prom with his scanner, which shouldn't happen... hell can it happen? I think you need a special wire to do that besides just the odbII port to some other port..

Far as frying the ECM with your friends scanner.. IF it was a homemade device that had like a 120v powersource i'd consider it... otherwise you've just managed to ground out a wire somewhere on the car...

 

I'm leaning towards the O2 sensor wires being shorted out.

-Paul

 

update guys...my car starts now!

you guys were right. pinched o2 wire was the culprit. it was caught inbetween the flanges at the cat and midpipe. luckily it is still good and does not need to be replaced. thanks evyerone for all the help!

 

Glad you found it.

 

i did the same dam thing....

 

ditto