Results 1 to 5 of 5

Thread: Lt1 94 bench wiring

  1. #1
    Carb and Points!
    Join Date
    Mar 2017
    Age
    33
    Posts
    7

    Lt1 94 bench wiring

    Is there a way to bench flash the lt1 94 ecu just wiring the aldl cable to ecu pins? What ecu pins need to be used? Anyone can help me? I want to try flash my ecu but the aldl port don't have connection

  2. #2
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    yep it's fairly easy, i had an ecm hooked up on the bench when i wrote eehack

    you just supply power and ground to a bunch o stuff. use a good clean power supply (i used an old PC power supply) or a well charged car battery.

    on the RED connector, A2 and A18 need to be grounded
    on the BLACK connector, B15, B30, and B31 need to be +12v
    on the GREY connector, C32 needs to be grounded
    on the BLUE connector, D1 needs to be grounded, D3 needs to be +12v

    it sounds like a lot, but it's just 4 grounds and 4 power.

    then for your ALDL data link, you connect RX and TX to D30 on the blue connector, and ground to that bundle o' grounds above.

  3. #3
    Carb and Points!
    Join Date
    Mar 2017
    Age
    33
    Posts
    7
    Quote Originally Posted by steveo View Post
    yep it's fairly easy, i had an ecm hooked up on the bench when i wrote eehack

    you just supply power and ground to a bunch o stuff. use a good clean power supply (i used an old PC power supply) or a well charged car battery.

    on the RED connector, A2 and A18 need to be grounded
    on the BLACK connector, B15, B30, and B31 need to be +12v
    on the GREY connector, C32 needs to be grounded
    on the BLUE connector, D1 needs to be grounded, D3 needs to be +12v

    it sounds like a lot, but it's just 4 grounds and 4 power.

    then for your ALDL data link, you connect RX and TX to D30 on the blue connector, and ground to that bundle o' grounds above.
    Thank you very much for your answer, my only doubt is regarding the connections that you mention rx and tx, I want to connect it to the obd1 terminal of 12pin of my cable without altering it, I understand that the only 4 pins that are used in the lt1 94 are pin A what is earth, pin B which is to diagnose, pin G which is to test the fuel pump and pin

    M which is for serial data, correct me if I am wrong please, but I need to put pin A to ground and pin M to pinD30 of the blue connector?

  4. #4
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    M which is for serial data, correct me if I am wrong please, but I need to put pin A to ground and pin M to pinD30 of the blue connector?
    you got it

  5. #5
    Carb and Points!
    Join Date
    Mar 2017
    Age
    33
    Posts
    7
    Quote Originally Posted by steveo View Post
    you got it
    Ok friend, thanks you so much

Similar Threads

  1. GM SPS Bench Flashing
    By MYLTWON in forum OBDII Tuning
    Replies: 13
    Last Post: 07-28-2019, 06:11 AM
  2. Wiring Schematic for bench harness LT1
    By EDZIP in forum GM EFI Systems
    Replies: 16
    Last Post: 05-26-2016, 08:20 PM
  3. ECM Test Bench
    By Six_Shooter in forum Other EFI systems and related topics
    Replies: 54
    Last Post: 04-15-2016, 06:34 AM
  4. test bench
    By ericjon262 in forum OBDII Tuning
    Replies: 16
    Last Post: 02-02-2014, 04:06 AM
  5. LC-1 on the bench
    By EagleMark in forum Other EFI systems and related topics
    Replies: 7
    Last Post: 08-09-2011, 09:17 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •