Results 1 to 10 of 10

Thread: Gm ls2 hot rod crate motor and harness with there ecu question about checksums

  1. #1
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default Gm ls2 hot rod crate motor and harness with there ecu question about checksums

    I pulled the file out of this car (68 camaro with gm crate ls2) and it had a bunch of checksums out of range and prompted me saying it cant be reflashed in this condition.Has anyone seen this?whats the way around it.Thanks

  2. #2
    EFILive Reseller ringram's Avatar
    Join Date
    Oct 2005
    Posts
    1,411

    Default

    Yeah just press the button to fix the checksums, it will be fine, you can then save and flash away. Ive done it a few times.
    Get EFILive in europe (http://www.efilive.eu).
    2007 Escalade ESV L92 6.2L VVT.
    2014 VF SV LS3 Maloo.

  3. #3
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default

    Thought so just making sure awesome man thanks for help

  4. #4
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    13,148

    Default

    I am not sure why they disabled the checksums in those ECM's, we have also seen it on some production cars too, must have been a finalised calibration on a Friday afternoon.
    Now there is a difference between 'Checksum Error' and 'Checksum Disabled'.
    If the Checksum is disabled then you are pretty safe to correct them and flash the file in. If the checksums are actually wrong then don't correct them and flash it in, chances are there was something wrong with the read.
    I no longer monitor the forum, please either post your question or create a support ticket.

  5. #5
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default

    They were disabled turned on flashed and all good.another Wierd thing is you can't change the fan settings.Owell tune came out nice picked up 50whp over the stock file that was in it.

  6. #6
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default

    Ok question.The gm harness has no ac ref,so when the ac gets turned on it doesnt bump the idle speed up.Looks to use a e67 computer 2006 ctsv computer layout,any idea if i can pin into the ecu connector to signal the ecu the ac is on to bump idle speed?and what pin would i use?

  7. #7
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default

    would it be pin17 on c3?tq requested?

  8. #8
    Senior Member
    Join Date
    Dec 2008
    Posts
    162

    Default

    or pin 57 on c3 ac pressure signal

  9. #9
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    My understanding is the ECM uses the AC Pressure Signal, it checks that the pressure rises above some threshold value.

  10. #10
    Lifetime Member
    Join Date
    Dec 2007
    Posts
    1,143

    Default

    Quote Originally Posted by AllOutPerformance View Post
    Ok question.The gm harness has no ac ref,so when the ac gets turned on it doesnt bump the idle speed up.Looks to use a e67 computer 2006 ctsv computer layout,any idea if i can pin into the ecu connector to signal the ecu the ac is on to bump idle speed?and what pin would i use?
    The AC is controlled via a signal on the CAN. The ECM gets this signal, turns on the AC and and then adjusts the engine torque and speed in line with AC load and cycling.

Similar Threads

  1. GMPP E67 LS2 Crate checksum issues
    By trudynosports in forum E37, E38 & E67 PFI ECM's
    Replies: 3
    Last Post: May 2nd, 2011, 12:33 PM
  2. Hot Rod Magazine...
    By joecar in forum Lounge
    Replies: 6
    Last Post: June 21st, 2010, 03:00 PM
  3. LS2 472bhp out of the crate (engine dyno)
    By Gelf VXR in forum Gen IV V8 Specific
    Replies: 1
    Last Post: June 3rd, 2008, 01:22 PM
  4. bench harness for ls2 and e38
    By minytrker in forum General (Petrol, Gas, Ethanol)
    Replies: 5
    Last Post: March 29th, 2007, 12:39 PM

Posting Permissions

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