1227747

• Programming 101 (focuses on GM 1227747 ECM)
• Tuning tips for the tables in the '747 ECM

• 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 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 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)

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