Problem with computer. Unable to receive codes

Tiny
ICEMATE
  • MEMBER
  • CADILLAC STS
I have a 1997 STS with 123,000 miles on a Northstar engine. Car operates and runs fine. Problem is it cannot pass NYS inspection. When hooked up to inspection computer it gets no readings or codes. Even tried driving 120 miles without shutting off engine and hooking it up to computer with same results. What is happening?
Can I get a used computer and have it programed for this vechile? How do you check onboard computer?
HELP !
Friday, September 28th, 2007 AT 8:57 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Pin # Description
4 Ground
2 serial data signal class 2
5 Ground
16 Power
check for power at pin 16!


https://www.2carpros.com/forum/automotive_pictures/62217_DLC97_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_30961_mitchell_2_33.jpg

Her's a bit of testing ingo..


https://www.2carpros.com/forum/automotive_pictures/62217_Diag_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_Diag1_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_Diag2_copy_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_Diag3_copy_1.jpg


You should be able to go to a good part store and by a remanufactered one. Try unplugging and replugging the connector first! Remove negative Battery cable first!
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Saturday, September 29th, 2007 AT 7:00 AM
Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
You can go through the heater controls and see if the pcm will communicate, press off and warmer simotanisly, it will run through its codes
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Monday, October 1st, 2007 AT 4:24 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
I have seen a fair amount of communication failures from a blown fuse.
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Wednesday, October 10th, 2007 AT 8:22 PM

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