I have the following label from my PCM
Service No. 09369464
Hardware No. 09357440 CSHJ
This PCM will end up being a Spare flashed with a 93 octane tune in the event i go E85. I want the ability to switch back & forth should i NOT be able to locate E85 if i'm traveling. Figure i'd keep it in an antistatic bag in a case in the trunk just in case.
Should i match the Hardware number, the Service number, or both? I looked up my VIN on GM's TIS site and i get this:
Part # ------- Cal ID #
9367184 -- 9367177
9369464 -- 9369396 -- New calibration changes PRNDL time constant delay from 3.0 seconds to .75 seconds
So it would appear that the Service Number indicates a Combination of the hardware present PLUS the actual calibration present on said hardware. However the donor PCM will be getting flashed anyways with my VIN and tune. Would it even really matter if the Service number didn't match so long as the Hardware Number did?
