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  #1  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Default Please help diagnose. OBDII cannot communicate. CPS? DIC?

The car will no longer start. I went outside the other day to start the car and the motor is turning over but it will not fire. There is no spark and we have ruled out any fuel related issue.

I plug in the OBD II reader and it says that it cannot communicate with the vehicle. This is new to me. What are the possibilities here? When I try to start the car the RPM gauge stutters up a bit and the car keeps cranking but will not start.

Also, the car what stuttering a bit before it not starting anymore.

What can it be? This one is tricky to me..
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  #2  
Old 21st April 2011
Pabllh Pabllh is offline
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How old is the dic? If you are not getting spark sounds a likely culprit.

Are you able to start the car jumping the battery?
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  #3  
Old 21st April 2011
Jssaab Jssaab is offline
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No communication = bad ECU.... and car will not start
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  #4  
Old 21st April 2011
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justinsaab justinsaab is offline
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It doesnt necessarily mean bad ecu.
Mine wouldnt communicate back when I first bought the car. Unscrew the obdII port from the footwell panel and look at the back of it. On mine, one of the wire terminals had backed out of the connector and wasnt making contact with the scan tool. I pushed it back in and wedged a piece of toothpick in there to hold it. Thats all that was wrong, worked perfectly from then on.
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  #5  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Quote:
Originally Posted by Jssaab View Post
No communication = bad ECU.... and car will not start
Would the engine be turning over if the ECU was bad? It just isn't firing, but it is turning over.


Is there anyhthing I can do to verify its the ECU?
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  #6  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Default Radiator fan comes on..

Note*

I just tried to start the car, when I try to start it it cranks and cranks but never fires. I also now noticed that when I am trying to start it it sounds like the radiator fan comes on and stays on for a little while.. maybe 20 seconds?


Idea?
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  #7  
Old 21st April 2011
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Quote:
Originally Posted by Kyled427 View Post
Would the engine be turning over if the ECU was bad? It just isn't firing, but it is turning over.


Is there anyhthing I can do to verify its the ECU?
I dont know how to verify that its not the ECU, but first you need to verify that its not other, less expensive things. I would say the engine would still turn over with a bad ECU but dont know for sure on that one.
Apart from all that. Did you ever get the scan tool to communicate to the car? Did you check the wiring at the back of the connector like I was saying?
What was the fuel pressure and volume at when you checked it?
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  #8  
Old 21st April 2011
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How did you rule out a fuel issue? Can you hear the fuel pump? and did you check all your ground connection? How old is your battery?
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Old 21st April 2011
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Check fuses and ecu power supply. If the cooling fan is running, there may be a ecu issue. Cooling fan starts to run if there is no ecu communication.
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  #10  
Old 21st April 2011
Kyled427 Kyled427 is offline
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What fuses should I check and where is the ECU power supply to check?


I will be doing all of this with my dad when he arrives back home from work in a few hours.
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  #11  
Old 21st April 2011
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Several people including myself have asked you questions to try and help diagnose your problem. If you cant answer them then whats the point? Good luck to ya. Im out
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  #12  
Old 21st April 2011
gghh gghh is offline
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Check fuses 26, 21, 31, 1.
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  #13  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Quote:
Originally Posted by justinsaab View Post
Several people including myself have asked you questions to try and help diagnose your problem. If you cant answer them then whats the point? Good luck to ya. Im out
That is why I said I am going to do all of these things when my dad gets home. I do not have the tools to unbolt the piece underneath the steering wheel in order to look at the OBD scanner port. I really appreciate the help, I am just trying to get all the information I can so when he gets home I can look at all possibilities. Sorry for not making that more clear.
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  #14  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Quote:
Originally Posted by Saaber95er View Post
How did you rule out a fuel issue? Can you hear the fuel pump? and did you check all your ground connection? How old is your battery?
I ruled out a fuel issue because the pump is coming on and my dad put gas in the spark plug holes to see if the car would fire that way and it did not. He then did something to make sure it was sparking, and it is not sparking.
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  #15  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Quote:
Originally Posted by gghh View Post
Check fuses 26, 21, 31, 1.
On the interior fuse box by the steering wheel? I can do that myself. Going to look now.
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  #16  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Those 4 fuses were all OK
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  #17  
Old 21st April 2011
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You would only get spark to the DIC if it is on the spark plug. How did he check for spark with the DIC off? I hope he didn't put gas in the plug hole and tried to start the car with the DIC on? That kind of diagnostic will ruin your parts and the repair will cost more than you bargained for. Tell your dad to be careful with the gas the DIC is electrical. Are you getting gas at the fuel rail? did you check for any loose battery or starter wire connections?

Quote:
Originally Posted by Kyled427 View Post
my dad put gas in the spark plug holes to see if the car would fire that way and it did not. He then did something to make sure it was sparking, and it is not sparking.

Last edited by Saaber95er; 21st April 2011 at 05:44 PM. Reason: added question
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  #18  
Old 21st April 2011
Kyled427 Kyled427 is offline
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Where would a relay for the ECU be? Someone said that may be my issue. I am going to investigate soon. Thanks for all the suggestions guys.
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  #19  
Old 21st April 2011
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we have had software crash in the process of flashing ecu's at work on audi's and the symptoms you are have seem consistent with a brain dead ecu... get a cheap ecu off someone on here and give that a try
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  #20  
Old 21st April 2011
Kyled427 Kyled427 is offline
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My ECU has never been tuned or even removed though so wouldn't it likely just be a bad connection to a relay or something? I understand I can get an ECU for cheap from someone on here, but then I would have to get it remarried to my car and the nearest SAAB dealership is 100 miles away with no Indy techs anywhere around.
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