Vehicle Information

Tech Edge is developing diagnostic and tuning software for a range of General Motors (GM, including Holden) vehicle computers. We have collected some information that may be of interest. We show you how to build your own diagnostic tools.

• Our latest information is on building a DIY Oxygen sensor meter at low cost.

GM ALDL (Diagnostic) information

• 8192 baud ALDL information for GM vehicles including VR, VS, VT (Holden) Commodores using 16176424, 16183082 & 16206304/5 ECMs.
  
  
• 160 baud ALDL information for VN & VP Holden Commodore, JE Camira and LD Astra which uses the 1227808 GM P4 ECM.
  
  
• Description of DIACOM hardware and its schematic.

ECM (Vehicle Computer) Information

• The GM 1227808 ECM including the 1227165, 16183082, 16206305, etc. as used in the JE, LD, VN, VP, and some VR and VS models.

Links to others sharing GM ECM information

• The DIY-EFI and sibling GMECM websites. For hard core EFI DIYers only.
• Vim Fuego's Holden Commodore Memcals page. Holden chip archive.
• Ludis Langens' GM ECM Goodies page. GM ECMs revealed!
• GM electronics from Delphi Automotive a GM spin-off, originally called Delco.