Can someone explain the full calculation and control parameters of CHECKSUM? Does the ECM or TCM perform the test? Is same VIN and/or model year OS essential between ECM/TCM? Thanks
Can someone explain the full calculation and control parameters of CHECKSUM? Does the ECM or TCM perform the test? Is same VIN and/or model year OS essential between ECM/TCM? Thanks
Trailblazer "RS" 5.3L 6L80 4x4 & '07 TBSS LS2 6L90 AWD