I'm wondering if anyone has a write up / pin out for building an OBD II LT1 Bench Flash tool? I'm curious because the OBD II schematics (attached below) shows two Serial Data pins (C4) Blue 7 and (C4) Blue 30. I've noticed (C4) Blue 20 is an Output / Field Service Enable is connected to the ALDL Connector. I'm not sure if (C4) Blue 20 is needed for bench flashing an OBD II LT1 PCM? I'm not sure if (C4) Blue 20 and (C4) Blue 30 are needed for bench flashing an OBD II LT1 PCM?
If the OBD II schematics (attached below) are correct, then Bench Flashing the LT1 OBD II PCM needs the following pins connected to the PCM?
(C2) Black Pin 15 Battery
(C2) Black Pin 30 Switched Ignition
(C2) Black Pin 31 Battery
(C4) Blue Pin 01 Ground
(C4) Blue Pin 03 Switched Ignition
(C4) Blue Pin 07 Serial Data
The links below are to the bench flashing tool offered by EFI Connections:
http://www.eficonnection.com/eficonn...spx?ItemId=716
http://www.eficonnection.com/eficonn..._extension.jpg
I'd like to build my own, and save a few $$!
dave w
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