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  • Help "Err Lost CMOS ram" error code

    Have a 86 911 turo with a SM4 1.05 and CDI box. I keep getting the above message flashed on the ECU and then the car starts stumbling and performing poorly. Clear the code and all is well...sometimes the code re-appears and sometimes not. Reason given by the ECU is "Battery has been disconnected for more than one month."
    Battery is new and obviously connected, good output from the alternator. Have power to pin 13 which is the 12V ram memory power source. I understand the early SM4's had problems due to chip contact point corrosions, but this has been gone through , chip was removed, contact points cleaned, and re-installed. The dealer did not find any chip contact corrosion and the ECU is functioning well to testing on the bench.
    Any other reasons out there that could cause this? Is the battery dead in the ECU and won't hold the slight charge needed to keep the RAM memory intact?
    Thanks,
    Andrew
    86 930

  • #2
    Anyone?

    Comment


    • #3
      Normally you just ignore this message, but are you sure you got power all time on memory pin? It could be the internal battery that are in bad shape or has come loose due to vibrations. Normally you do not notice this but you loose tps and o2 adaption whne it happens, so if you are running with tps as load it could affect performance.

      With 1.09 chip you set tps to fixed and it will not affect power loss.

      Check the memory wire and check the battery in SM4, preferable at some electronics shop.
      Robert Jansson
      MRM-Racing

      Comment


      • #4
        When it happens the car has a huge deadspot when pressing the pedal, like an old carburetor loosing it's accelerator pump. E-mailed autronics and they want me to send it back....might be a loose connection between the memory chips themselves.
        My question is this...is the battery in the chip itself? Can't I just upgrade the chip instead of trying to find what the problem is with this old one? Australia shipping...R&R of the chip...this is going to take forever. Can anyone here in the States just put a chip in?
        Thanks for the inout, I do a ppreciate it.

        Comment


        • #5
          Autronic ecu's use a capacitor or Supercap for backup. You could certainly change to the 1.09 firmware and use fixed throttle endpoints. I would be inclined to send the ecu for service, despite the cost and delay.

          Chris
          He gets his lap dogs to do his talking for him. Buzzard is a good example.

          Comment


          • #6
            If they do put in the new 1.09 chip, is it plug 'n' play or do I have to go back to the tuner?

            Comment


            • #7
              There are some changes required to your cal file after installation of the 1.09 chip.

              Chris
              He gets his lap dogs to do his talking for him. Buzzard is a good example.

              Comment


              • #8
                Thanks........one last question.
                I have no idea what the inside of the autronic ecu looks like. I'm envisioning a mother board type deal where the chip then plugs into. Anyone have any pics? Reason I ask is ,what if the chip is not the problem? What if there is a power interruption somewher in the "board" where the chip plugs into. Is this possible, I don't know.....

                Comment


                • #9
                  As Chris stated the chip is not the problem but if using 1.09 you can bypass a bad backu battery! Best to give it a check at Autronic or an electronic shop that can check replace/check the backup battery (Super Cap).
                  Robert Jansson
                  MRM-Racing

                  Comment


                  • #10
                    Autronic's response:

                    Hello Andrew,

                    What is the Serial number of the ECU? It is probably in the 8000 to 9999
                    range. Firmware version v1.05 indicates a relatively early ECU and early
                    ECUs had a taller socket that didn't have the contact problem. Your ECU
                    might have a different problem and the process of removing / refitting the
                    CPU or even thermal cycling of ECU On/Off operation makes the problem come
                    and go. From your description of the problem it could be related to power
                    connections between one or several memory chips rather than the actual CMOS
                    battery itself (as your backup supply is connected externally).

                    I think the best course of action would be to send the ECU back for
                    comphrensive testing and repair. It should be sent to;

                    Aubert Electronics Pty Ltd
                    24 Heather Grove
                    Belgrave South
                    Victoria 3160
                    AUSTRALIA

                    That is why I'm interested in the internal layout of the ECU, how do I know there is not an additional problem even before the chip? Very frustrating, words cannot express....

                    Comment


                    • #11
                      Frustrating as it is, the best course of action has been advised. Your dealer may be able to supply a loan ecu for the period your ecu is away for repair. My advice is to investigate this option and send the ecu as soon as possible.

                      Chris
                      He gets his lap dogs to do his talking for him. Buzzard is a good example.

                      Comment


                      • #12
                        I had an issue with my SM4 very early on with the battery voltage the ecu was seeing,14v supply was being seen as 8v by the SM4. Sent it back to Autronic and came back with no fault found, but never had the problem again!! Whether they repaired it or not remains to be known, but they didnt waste any time, it was returned to me within several days.

                        Comment


                        • #13
                          Like everyone stated, send it in to be looked at. By the time you keep looking/testing/playing with it it could be repaired. No one is going to be able to tell you what the problem is over the internet.

                          Comment


                          • #14
                            The ECU has already been sent by the dealer back to Australia. I was just hoping to understand this unit a little better and to see if anyone else has had this problem, plus leaving a searchable post for anyone who might have this problem in the future.
                            I've so far have heard : ignore and just reset the error, to it's the micro-battery, to it's the memory chip or it's the connections between the memory chips.
                            It's been my experience that when anything electronic like this has an intermittent error that cannot be consistently reproduced , the fix usually does not hold, or there was more than one underlying problem.
                            I'll post what Autronics finds wrong with the unit when I get it back. Thanks for your responses and giving me insight on this ECU, it's appreciated.

                            Comment


                            • #15
                              I've had this happen to older ecu's like yours and the problem was in the socket.. The fix was to remove the chip and put some special electrical contact grease and problem would never come back..

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