98 PCM Diagnostic question
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98 PCM Diagnostic question
What would cause the PCM to command the fp off and keep the car from firing?
A quick rundown or the situation can be found @
https://ls1tech.com/forums/fueling-injection/393904-fuel-problem-has-everyone-stumped.html
Now I am down to the PCM and was wondering if anyone could explain why the PCM went down.
DTC was PO601
Internal Control Module Memory Checksum Error
Theory's welcome!
A quick rundown or the situation can be found @
https://ls1tech.com/forums/fueling-injection/393904-fuel-problem-has-everyone-stumped.html
Now I am down to the PCM and was wondering if anyone could explain why the PCM went down.
DTC was PO601
Internal Control Module Memory Checksum Error
Theory's welcome!
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I dont beleive the car was evar flashed. (but I'll ask) I will check if the light is flashing. However it does the same thing in another car. It would'nt fallow the PCM to a diffrent car would it??
Just cranks over and will not let the car start up.
Just cranks over and will not let the car start up.
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Originally Posted by HALLZ
What would cause the PCM to command the fp off and keep the car from firing?
A quick rundown or the situation can be found @
https://ls1tech.com/forums/showthread.php?t=393904
Now I am down to the PCM and was wondering if anyone could explain why the PCM went down.
DTC was PO601
Internal Control Module Memory Checksum Error
Theory's welcome!
A quick rundown or the situation can be found @
https://ls1tech.com/forums/showthread.php?t=393904
Now I am down to the PCM and was wondering if anyone could explain why the PCM went down.
DTC was PO601
Internal Control Module Memory Checksum Error
Theory's welcome!
* I presume it is for safety/legal reasons that once a PCM has failed a memory checksum or other serious fault, the PCM deliberately prevents itself from being reflashed. Short of removing the chip and reflashing it manually there is not much you can do.
If you have not ever tried reflashing the PCM and you got that fault, then chances are the PCM's memory is really damaged and the PCM *must* be replaced.
Do you have a spare PCM you can test with?
Note: what I described is just one possibility, there may be other reasons for the symptoms you are seeing.
Regards
Paul
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Yep, once that Checksum error has been set at least on the '98's , your PCM is toast. I sent and tried to have mine "recovered", and it did not help.
All you can do is trash it, and get another one.
Make sure you match up the GM service numbers, etc. on the tag on the PCM, and be sure to get one for the correct tranny (a4 or M6) and ONLY '98 PCM's will work for a '98 !
All you can do is trash it, and get another one.
Make sure you match up the GM service numbers, etc. on the tag on the PCM, and be sure to get one for the correct tranny (a4 or M6) and ONLY '98 PCM's will work for a '98 !
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Thanks,
I will let the guy know (not my car) there is a old code and a pending along with one other emisions/evap (if I remeber correctly)
I was just wondering. From my understanding the current owners has not flashed or changed anything. The car is stock except for the fuel pump. But who knows what the previous owner put it through.
Thanks again guys!
I will let the guy know (not my car) there is a old code and a pending along with one other emisions/evap (if I remeber correctly)
I was just wondering. From my understanding the current owners has not flashed or changed anything. The car is stock except for the fuel pump. But who knows what the previous owner put it through.
Thanks again guys!