Idle Adaptation
      "What exactly is a 'system adaptation', and how is this different from a
        battery disconnect reset of the DME?"
      The 964 DME ECM has two adaptations:
        1. Idle Adaptation -
           On the earlier 3.2 DME system the idle was set by an external jumper
           (caused open-loop idle) & then the idle screw was set to "center"
           the idle RPM. On the 964, the Hammer causes the DME to go open-loop
           and then causes the DME to "step" to the center for 880 RPMs. This
           results in the closed-loop idle being "centered" for full
           regulation.
         2. CO adaptation -
           The 964 DME ECM goes thru a CO adaptation whereby it runs open-loop
           without the O2 sensor to "center" the CO setting to allow for small
           variable changes, e.g. air leaks, fuel pressure, so in the
           closed-loop mode the O2 system has optimal range (similar to TRA in
           OBDII).
         Both of the adaptation values are "lost" if the constant battery
           voltage (pin 18) is removed. #1 above requires use of the Hammer. #2
           occurs at initial running after battery voltage "loss".
      "What happens with the idle in the case of a battery disconnect and no
        hammer adaptation?"
      The closed-loop still maintains the target idle of 880 RPMs but it's not
        optimized for load changes, e.g. the A.C. compressor, the fans, the
        lights, and the adapted CO setting.