1227747

www.diy-efi.org/gmecm/ecm_info/1227747/

General info

• • Programming 101 (focuses on GM 1227747 ECM)

  • Tuning tips for the tables in the '747 ECM

Projects

• • Jason Weir has a page on putting a '747 into non-GM vehicles.

  • 1227747 used for spark only, on a carbed engine

  • Closed loop fueling strategy used by the '747

.ecu files

.ecu files describe the layout of tables and data items in a PROM image. There are several image editing programs that use .ecu files in conjunction with .bin files to allow you to edit the tables in a prom image in real world units rather than hex. Promedit and Winbin are two examples. Here are several 1227747 compatible .ecu files:

• • 1227747.ecu

  • 7747_001.ecu

  • 7747_002.ecu

  • 7747ecu.ecu the most complete version?

  • Spk747_3.ecu 1227747 used in a timing only configuration (carb for fuel).

PROM images

Prom images are listed by broadcast code, which uniquely identifies the application of the Prom (Engine, transmission, rear end, ECM, ec.)

• • ABUL 1987 Astro with the 4.3 Z TBI,1227747

  • ACSU0024 1987 V 1500 (Suburban) 5.7L, 700R4, 4x4, 3.73 axle ratio, and AC.

  • ACSW 87 C1500 pickup, 5.7L TBI w/T700R4,1227747

  • AFDY6022 5.0 automatic

  • AJUK 88 C1500 pickup, 5.0L, Auto, 1227747

  • AKAJ1147 1987 K 1500 5.7L, 700R4, 4x4, 3.73 axle ratio, leaded compatible (no closed loop) and AC.

  • AKAL 87 5.7L automatic

  • AKAR1180 5.7L manual leaded fuel option (no closed loop)

  • AKDX2088 4.3L automatic

  • AKSN 88 4.3L 5spd

  • AMUR 88 C/K pickup, TBI EFI system, 1227747

  • ANLW5469 89 5.7L automatic

  • ANLZ5483 5.7L automatic

  • ANTZ 89 7.4L manual

  • APAB 4.3L manual 3.42 rear end ratio

  • ARHT7465 5.7L manual

  • ARPC7509 5.0L manual

  • ASDU 1991 Chevy C-1500 5.7L V8 Auto

  • ASDW9544 5.7L manual

  • ASDZ9578 5.7L automatic

  • AZFT9503 7.4L automatic (THM400)

Schematics/service info

• • 1227747 ECM Pinouts: Page 1, Page 2, Page 3, Page 4, Page 5, Page 6, Page 7