1996 GMC Sierra W/no check engine light and can't read pcm
#1
1996 GMC Sierra W/no check engine light and can't read pcm
Hi...I have a 96 gmc sierra Stepside Z71 xc, 5.7/4wd/auto...I bought it 2 months ago and have been trying to figure out why when i start the car the ses light does not light and when i try to read my computer, my scanner says it can't communicate...I have used the scanner on my 96 suburban without problem, so i know the scanner is working...the truck seems to run ok...it had a 95 single cat exhaust with homemade o2 sensor ports wich i have since changed for the correct duel cat setup...I also noticed that the seatbelt warning light, key in ignition, headlight warning buzzer don't work either?? maybe coincidence?? I have checked all fuses and the wires all look in tact...I need help or i wont be able to pass inspection...any help you can give is greatly appreciated...thanks in advance...John
#3
thanks, but tried it
hi and thanks for your quick reply, i did buy a pcm from ebay from a 96 tahoe with same motor and trans etc...plugged it in and no change...is there anything special you have to do when changing pcm?? after i swapped them, i didn't even notice and change in the way the motor ran and i assumed there should have been while the truck relearned its functions...thanks
#5
Hi and thanks for your reply...I have checked all fuses and they are good, there is no power to the port, i was wondering if there was a relay or something that might have been unplugged or be bad...and i thought the ses light is an led...so it really can't burn out like a conventional bulb...I think it is more than a coincidence that the ses and port are both dead, just can't figure out why...thanks for your thoughts though...every little bit helps
#7
I have been boggling minds from coast to coast...lol...the no ses light and port seem to be to much of a coincidence, i was hoping there was a trick to disable both and a fix to get em working again...can't really figure out why someone would do it though....thanks for your reply