PRODUCTION SERVICE SERVICE PRODUCTION PRODUCTION BROADCAST CONTROLLER CALIBRATOR CALIBRATOR ECM CODE ECM PROM PROM CODE 1991 16139784 ASJT 1228706 16149595 9596ASJT 16139794 ASJU 1228706 16149663 9664ASJU 16138801 ASAW 1227748 16148890 8892ASAW 16138811 ASAX 1227748 16148895 8896ASAX 16138821 ASAY 1227748 16148899 8900ASAY 16138831 ASAZ 1227748 16148904 8905ASAZ 16139383 ASDD 1228707 16151372 1374ASDD 16139393 ASDF 1228707 16151377 1378A DF 16139403 ASDH 1228707 16151382 1384ASDH 16139413 ASDJ 1228707 16151387 1388ASDJ 16155613 AWJB 1228707 16156319 6320AWJB 16155623 AWJC 1228707 16156323 6324AWJC 16156804 AWSD 1228253 16156837 6838AWSD 16158311 AWWL 1227748 16158338 8339AWWL 16158381 AWXD 1227748 16158382 8393AWLD NOTE when replacimg the Production ECM Cmntroller with a Remanufactured ECM Control er it is important to transfer the Production Broadcast Code and Production ECM number to the Remanufactured ECM Controller Label Please do not record on ECM Cover This will enable positive identification of ECM Components throughout the service life of the vehicle B j 1991 GENERAL MOTORS SERVICE P RTs 0Pa RAT10Ns Bu cK 44N 2 91 3 51 3 999