BAM vs CMDT: When J1939 Transport Protocol Mismatches Masquerade as Calibration Faults
I want to walk you through a failure that cost us three days on a dyno cell in Toledo. The vehicle was a Tier 4 final off-highway machine—19-liter, inline-six, dual ECUs sharing a single CAN bus backbone. The symptom reported by the field service laptop was straightforward: “Calibration checksum invalid.” The ECU would reject the reflash halfway through block […]