General info


.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.

PROM images

Prom images are listed by broadcast code, which uniquely identifies the application of the Prom (Engine, transmission, rear end, ECM, ec.) Mask ID 32 means 86-88 calibration with cold start injector, Mask ID 6e is an '89 calibration without the cold start injector.

Broadcast Code (BCC) Mask ID Application
86 TPI ???
87 Z28 305 TPI auto ???
88 Corvette 0x6e
86-88 FBA 350 0x32
89 Corvette 0x6e
8 cyl ???
ABTM 0x32
ABTP 0x32
ABTR 0x32
ABTZ 0x32
ABWT 0x32
ACSV 0x6e
AMJ 0x32
APYN3496 0x6e
APYP 0x6e
ARAP 0x6e
BUA1728 0x32
AUXH 0x94 4 cyl TBI S-10

Schematics/service info

'86-'88 5.0 V8 LB9 5.0 PFI "F" F body schematics: Page 1, Page 2, Page 3, Page 4, Page 5, Page 6
'89 Firebird: Page 1
'88 (?) Corvette: Page 1, Page 2, Page 3, Page 4, Page 5