Trailblazer/Envoy programming troubles continue

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  • greasybob
    Senior Member
    • May 2008
    • 1590

    Trailblazer/Envoy programming troubles continue

    Pretty good day, first replaced and flashed an ECM for an 07 Cadillac Escalade that had intermittent no crank and P0606. Then finally figured out how to use the PTP ll to replace and unlock a radio on an 07 Silverado Classic, not sure how many GM radios this will work on but it should be able to unlock any GM radio that is flashable. Then figured out how to use it to do a 10 minute pass key relearn. Then came the 02 trailblazer. I tried to update the PCM for idle control and the EV fan clicking,. I successfully erased the memory then got about 450,000 of about 500,000 bytes programmed when it stopped, the lap top bleeped a couple of times and error codes E4491 and E4423 came up. I had the fuse 6 and fuse 51 removed as prescribed. Tried a couple more times but can only get about 4000 bytes to load. I have a used PCM for back up in case I had trouble as I remember from previous posts. Maybe the Eprom chip or whatever they call it in there is weak and can't handle the reflash ? Might try foolig around with this some more yet tonight.
  • eddiesverus
    Senior Member
    • Dec 2008
    • 414

    #2
    Originally posted by greasybob
    Pretty good day, first replaced and flashed an ECM for an 07 Cadillac Escalade that had intermittent no crank and P0606. Then finally figured out how to use the PTP ll to replace and unlock a radio on an 07 Silverado Classic, not sure how many GM radios this will work on but it should be able to unlock any GM radio that is flashable. Then figured out how to use it to do a 10 minute pass key relearn. Then came the 02 trailblazer. I tried to update the PCM for idle control and the EV fan clicking,. I successfully erased the memory then got about 450,000 of about 500,000 bytes programmed when it stopped, the lap top bleeped a couple of times and error codes E4491 and E4423 came up. I had the fuse 6 and fuse 51 removed as prescribed. Tried a couple more times but can only get about 4000 bytes to load. I have a used PCM for back up in case I had trouble as I remember from previous posts. Maybe the Eprom chip or whatever they call it in there is weak and can't handle the reflash ? Might try foolig around with this some more yet tonight.
    Does this Trailblazer have an Aftermarket Radio? Check if it has a network adapter installed? The reason you remove fuse 51 and 19 is to disable any class2 data traffic that will affect the programming flow of data. I have had several Trailblazers with aftermarket radios that have affected programing. I have to uninstall the radio and the network adapter installed to the OE radio Harness.
    Hard Work, commitment, Honesty and not giving up is what Makes us better Tech's

    Comment

    • greasybob
      Senior Member
      • May 2008
      • 1590

      #3
      Thanks for the reply, no after market radio or remote starter installed. Fuse 19 ? I'm sure it said fuse 6 (lgm/dsm) and fuse 51 (brake). Any ways I think we're done here, the PTP ll won't even recognize the PCM any more, check engine light doesn't come on any more either, I was going to try and run a wire directly from the dlc serial data link to the pcm serial data wire and disconnect all othe devices from the class 2 serial data line but too late now and don't feel like risking my backup PCM.

      Comment

      • Orevin
        Senior Member
        • Aug 2010
        • 1110

        #4
        I would isolate the PCM from the rest of the Class 2 bus. Splice pack SP205 is attached to the driver side lower panel:

        02_envoy_S205_01.jpg


        Remove the comb and jumper pin A (ppl, DLC) to pin B (dk gn, PCM). Let us know how it goes!
        -Kai-
        Chicago, IL

        Comment

        • greasybob
          Senior Member
          • May 2008
          • 1590

          #5
          Thanks, this was my plan....sort of.

          Comment

          • Orevin
            Senior Member
            • Aug 2010
            • 1110

            #6
            Originally posted by greasybob
            Thanks for the reply, no after market radio or remote starter installed. Fuse 19 ? I'm sure it said fuse 6 (lgm/dsm) and fuse 51 (brake). Any ways I think we're done here, the PTP ll won't even recognize the PCM any more, check engine light doesn't come on any more either, I was going to try and run a wire directly from the dlc serial data link to the pcm serial data wire and disconnect all othe devices from the class 2 serial data line but too late now and don't feel like risking my backup PCM.
            You posted that while I wrote my response. Yeah, sounds like this PCM is toast. You might want to try what I wrote above when you flash the replacement PCM.
            -Kai-
            Chicago, IL

            Comment

            • greasybob
              Senior Member
              • May 2008
              • 1590

              #7
              If I can dig up another back up I'll give it a try in the morning, Why is this particular PCM suseptable to interference from other devices during flashing, Ive never had a problem with any other GM product, I would think that there is other activity on the class 2 serial data line on other GM products during flashing, maybe the data devices addresses are similar ?

              Comment

              • Orevin
                Senior Member
                • Aug 2010
                • 1110

                #8
                I don't know what makes this network so special. A few weeks ago I had a similar experience with a Trailblazer and cutting off the other modules allowed for a successful reflash (used the Tech 2 though). It is important NOT to turn off the key (unless instructed to do so by the software) if a reflash fails, as this usually signals the PCM that the file transfer is complete. This applies to pretty much all makes.
                Last edited by Orevin; 10-10-2011, 06:39 PM. Reason: typo
                -Kai-
                Chicago, IL

                Comment

                • greasybob
                  Senior Member
                  • May 2008
                  • 1590

                  #9
                  I'll throw caution into the wind and try your method in the morning, I'll let you know how it goes, thanks. One thing I've noticed since the last PTPll firmware update is that it will now connect to all of the single wire can (key 21) devices that I've tried it with.

                  Comment

                  • Orevin
                    Senior Member
                    • Aug 2010
                    • 1110

                    #10
                    Originally posted by greasybob
                    I'll throw caution into the wind ...

                    Maybe not the best approach... you should be at least twice as cautious now!

                    If you are going to install a used PCM, start with the 10 minutes theft relearn via SPS first. This way you don't loose the current calibration in the replacement PCM, if there still is an issue. If that works, without communication errors, continue with the reflash.
                    -Kai-
                    Chicago, IL

                    Comment

                    • USpMD
                      Senior Member
                      • Oct 2010
                      • 171

                      #11
                      Quote
                      "I tried to update the PCM for idle control and the EV fan clicking,. I successfully erased the memory then got about 450,000 of about 500,000 bytes programmed when it stopped, the lap top bleeped a couple of times and error codes E4491 and E4423 came up. I had the fuse 6 and fuse 51 removed as prescribed. Tried a couple more times but can only get about 4000 bytes to load. I have a used PCM for back up in case I had trouble as I remember from previous posts. Maybe the Eprom chip or whatever they call it in there is weak and can't handle the reflash ? Might try foolig around with this some more yet tonight".[/QUOTE]

                      I dont know guys, but I suspect this is caused by comunication error from GM site to laptop, I just did two of these last week, Bob, what are you using to perform the reflash, you state PTP II but laptop of Verus? I would try a different laptop, I suspect its not related to anything else on the network, try this with another computer, I suspect its a internal error to the unit your using to reflash and not the vehicle
                      "I wanna help the helpless, but I could careless about the clueless". Dennis Miller

                      Comment

                      • greasybob
                        Senior Member
                        • May 2008
                        • 1590

                        #12
                        Whew !!! It worked, thanks guys!!!!! I disconnected the splice pack and jumped A to B and disabled the AVG. It flashed completely Thanks again. Only took about 5 minutes to load.

                        Comment

                        • hefaus
                          Senior Member
                          • Dec 2007
                          • 435

                          #13
                          Avg

                          Originally posted by greasybob
                          Whew !!! It worked, thanks guys!!!!! I disconnected the splice pack and jumped A to B and disabled the AVG. It flashed completely Thanks again. Only took about 5 minutes to load.
                          Hi Greaseybob. I have to bite. What's AVG stand for? Cant seem to find a reference. Thanks

                          Comment

                          • gentz
                            Senior Member
                            • Jan 2010
                            • 191

                            #14
                            Its and antivirus program...
                            Diagnostic Specialist, diagnostic tool specialist. You name It I have it or have used it! MasterTech since 1998.

                            Comment

                            • Trindaddy
                              Senior Member
                              • Jan 2010
                              • 339

                              #15
                              But AVG (which i use) only allows up to 15 mins of disable time. Isn't that a little risky? I have never had to disable it in order for a reflash to work. I'm using the free version. Does yours allow more than 15 mins?

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