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2K Chevy Blazer ODB2 issues

6 messages,  Last post on Jan 26, 2008 at 6:59 PM

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#1 of 6 2K Chevy Blazer ODB2 issues by mchero Jan 04, 2008 (2:46 pm)
Have a co-worker whos 2000 Blazer won't pass inspection because the ODB2 interface won't link. In order to pass inspection the computer needs to be checked for codes, check engine light is on.   What options do we have other than replace the computer? The reader will work on other autos.   Ideas, thoughts? Replies to this message: mchero (Jan 25, 2008 2:57 pm) steve_ (Jan 25, 2008 4:12 pm) mchero (Jan 26, 2008 7:01 am) and 2 more...
#2 of 6 Re: 2K Chevy Blazer ODB2 issues [mchero] by mchero Jan 25, 2008 (2:57 pm)
Replying to: mchero (Jan 04, 2008 2:46 pm) Well after 3 weeks of NO RESPONSE I stumbled across the problem... Apparently, the cigarette lighter fuse ALSO powers the interface, No fuse, no communication with the computer!   Replaced the blown fuse corrected!   Hope this helps others.     Replies to this message: steve_ (Jan 25, 2008 4:12 pm) mchero (Jan 26, 2008 7:01 am) steve_ (Jan 26, 2008 1:07 pm) and 1 more...
#3 of 6 Re: 2K Chevy Blazer ODB2 issues [mchero] by steve_ HOST Jan 25, 2008 (4:12 pm)
Replying to: mchero (Jan 25, 2008 2:57 pm) Thanks for the update. Seems a little odd that the lighter would be on the same circuit as the ECU, considering all the stuff people plug into the power ports.   Good stumbling. Replies to this message: mchero (Jan 26, 2008 7:01 am) steve_ (Jan 26, 2008 1:07 pm) mchero (Jan 26, 2008 6:59 pm)
#4 of 6 Re: 2K Chevy Blazer ODB2 issues [steve_] by mchero Jan 26, 2008 (7:01 am)
Replying to: steve_ (Jan 25, 2008 4:12 pm) Yes Steve, I was caught by surprise on this one. On the owners manual it states the fuse supplys both lighter and the Data Interface. Replies to this message: steve_ (Jan 26, 2008 1:07 pm) mchero (Jan 26, 2008 6:59 pm)
#5 of 6 Re: 2K Chevy Blazer ODB2 issues [mchero] by steve_ HOST Jan 26, 2008 (1:07 pm)
Replying to: mchero (Jan 26, 2008 7:01 am) You can buy 9 volt battery gizmos that plug into your power port to retain your ECU (and radio) settings when you swap out your car battery. Maybe that's one reason why they run the data interface that way. Replies to this message: mchero (Jan 26, 2008 6:59 pm)
#6 of 6 Re: 2K Chevy Blazer ODB2 issues [steve_] by mchero Jan 26, 2008 (6:59 pm)
Replying to: steve_ (Jan 26, 2008 1:07 pm) Excellent point Steve. I have seen the dealers insert a plug into the cigerette lighter with a battery on the other end when swapping out 12 volt batteries. Was told it keeps the memory in the computer while the 12v battery is disconnected.   RM

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