I'm no expert but got into this when I was trying to control an ECC IV for testing transmission pressure conrtrol valves.
In general, a checksum is simply a computed value to which another computed value is compared to assure data integrity. For example, a unit of data is to be transmitted across some communications medium, a piece of wire, for example. Prior to sending the data unit, the sending device applies the data to some algorithm (formula) and appends the result of the computation to the data unit as a "checksum". The receiving device will perform the same computation on the data unit and compare it to the checksum that was appended to the data unit prior to transmission. If the checksums are equal, it is assumed that the receiver received the correct data.
So My first guess would be that you have and old battery and that the system voltage drops when the engine speed diminishes causing a sag in system voltage. My next guess would be a bad powertrain control module or ECU.
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