ODB2 port problem?
ODB2 port problem? I have just finished a swap of a 98 LS1 into my 94 firebird. Car runs great, but I can't get HPTuners to connect to the PCM through the ODB2 port. I wired it up by this diagram and have tripple checkeed all four wires, the 12+ is live all the time, not switched, grounds are good and the serial data has been tested back to the PCM and it is correct. Yet when I try to read the PCM it says to check and make sure the key is on teh on position and the cable is connected? WTF?
BTW for reference though, the #9 port is not even used on the HPTuners cable. There is no prong on the connector there......
I know the cable works on my 99 and several other 99-02 cars, I wanna say its been tested on a 98 too before
I know the cable works on my 99 and several other 99-02 cars, I wanna say its been tested on a 98 too before
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Then you have to figure out what is wired wrong. The grounds and power are easy, so double check that pin 2 of the ALDL is going to PCM BLUE 58. That's the Class 2 serial data. Make sure you didn't get mixed up with the UART serial data line that goes to PCM BLUE 3. That isn't needed at all.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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Originally Posted by Speartech
Then you have to figure out what is wired wrong. The grounds and power are easy, so double check that pin 2 of the ALDL is going to PCM BLUE 58. That's the Class 2 serial data. Make sure you didn't get mixed up with the UART serial data line that goes to PCM BLUE 3. That isn't needed at all.
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Joined: Sep 2004
Posts: 3,147
Likes: 12
From: Downers Grove, IL
Technically the grounds are supposed to be run separately, but I have seen a lot of people just tie them together directly behind the port and then run a single ground without any problems(me included). They can be grounded to anywhere there is a grounded piece of metal. I tied mine into the dashboard ground, but if your having problems mabey try grounding them to the same place that you grounded all your computer grounds.
