This is topic Check engine- code reader won't spit out codes in forum Tech Talk at Northern California Ford Owners  .


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Posted by 50.stang (Member # 4009) on :
 
My check engine light came on after installing a new set of O2's on an 88 and it won't go off. When I hook my code reader up to the port, when its put to test mode, the light will just go dim and it wont spit out the codes. Has anyone ever ran into this problem and what was the fix.

PS even when I put the old o2's back on the light would not go off.
 
Posted by JohnB (Member # 969) on :
 
Did you make sure to hook up both connectors?
 
Posted by 50.stang (Member # 4009) on :
 
Yea I did,

Ive ran hundreds of these tests and I never ran into this
 
Posted by JohnB (Member # 969) on :
 
Well, unfortunately it sounds like the PCM may be the problem. I have the exact same prob with my 01...and it's because of the PCM.
 
Posted by 50.stang (Member # 4009) on :
 
thats not good, I was hoping that it wouldn't be the problem
 
Posted by silverLX (Member # 3207) on :
 
quote:
Originally posted by 50.stang:
thats not good, I was hoping that it wouldn't be the problem
better than not knowing the problem [patriot]
 
Posted by JohnB (Member # 969) on :
 
Before you throw another PCM in...check your ENTIRE harness and make sure you don't have any breaks, shorts, bare wires, etc. There is a reason why it is going out. [Smile]
 
Posted by 50.stang (Member # 4009) on :
 
Ill do that, I dod change the O2 harness before this happened also, maybe that had something to do with it. But I did change it back and it didnt help.
 
Posted by Cobra5.0Jeep (Member # 1482) on :
 
quote:
Originally posted by 50.stang:
My check engine light came on after installing a new set of O2's on an 88 and it won't go off. When I hook my code reader up to the port, when its put to test mode, the light will just go dim and it wont spit out the codes. Has anyone ever ran into this problem and what was the fix.

PS even when I put the old o2's back on the light would not go off.
i had this problem turned out after spending alot of money on trying to fix the problem that my computer had failed. Atleast i got a rid of a lot of wiring problems [Eek!]
 
Posted by 50.stang (Member # 4009) on :
 
could I use an auto computer with a 5 speed and what are the effects?
 
Posted by Cobra5.0Jeep (Member # 1482) on :
 
quote:
Originally posted by 50.stang:
could I use an auto computer with a 5 speed and what are the effects?
i don't think there would be a problem.

[ January 31, 2006, 11:40 AM: Message edited by: Cobra5.0Jeep ]
 
Posted by Jdub07 (Member # 2728) on :
 
This might sound dumb but how old is the battery in your scanner?
 
Posted by 50.stang (Member # 4009) on :
 
I thought about the same thing, I changed the battery and the same result. I will use my friends scanner before I swap PCMs, just to see if its a scanner problem.
 




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