Results 1 to 7 of 7

Thread: DTC's & EEHACK

  1. #1
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    410

    DTC's & EEHACK

    I've frequently had odd DTC's appear/disappear in the past & generally turn off any I don't need.

    I've swapped PCM's recently and this one can run the fans at high speed, the previous only ran them at slow speed.

    Now I'm getting these dtc's obviously the fans are kicking in full, noisey & cooling the car.

    I've flashed with EEHack 4.7 & Kur4o's recent 4.92 and fans are coming on at 70C (car was still warm)

    I've been getting
    43d knock sensor which checks out OK with volt meter.
    LT4 filter swapped back in, still has fault.

    99 Tach output
    Both are switched off. NO DTC's show up in EEHack.

    I ran Gary Dougs Scan94-95 and that still shows the DTC 99 as active and won't clear.
    ------
    I dicked about with the tune zeroing the timer delay for fan tach output and got different DTC's... fan 1 dtc 77 & CCP/electrical fault (missed the no, EEHACK crashed)
    ---
    I don't suspect a mechanical or wiring issue as such.
    PCM Knock sensor voltages checked out OK.

    Alternator is 14.01
    Body terminals on inner wing 13.8
    PCM shows ecm input voltage as 13.1

    I'll reflash with an earlier tune that doesn't show the fault.

    I've also had 97 vss fault occasionally pop up.

    Any thoughts?

    TIA
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  2. #2
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114
    I've not gotten any DTC with kur4o eehack patch all has been good with multiple uploads so far.

  3. #3
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    410
    I've been reading up on the DTC's to see what's common about them

    DTC Codes
    43 Knock sensor Output D22 : PCM puts out 5V, sensor pulls it 2.5V DTC SET = >4.1V Open <0.78V sensor Grouned
    72 VSS Input A32 : ****** CHECK CALIBRATION ID

    97 VSS Output B 8 :DTC SET wrong voltage for 26seconds on CKT 817
    99 Tach Output A13 :DTC SET wrong voltage for 26seconds on CKT 121

    I've no common socket, 97 & 99 both mention wrong Voltage although this is the 2nd PCM that I've had codes on.

    DTC 72 VSS mentions to check Calibration ID

    *** CALIBRATION ID T-Side E-SideModule2
    Stock M6 Z28 = 16209461 16209314 16209313
    Burkhardt PCM (auto = 16209491 16209320 16209319

    If I change from a Manual PCM to an auto & reflash with the same .bin, that should be correct?


    TIA
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  4. #4
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    410

    Update: It seems to be the tune.

    OK guys,
    It does appear to be the tune that was out rather than any version of EEHack

    Reflashed the last tune with EEHack and both fans kicked on below 30C without any DTC's showing up.
    Reflashed with a much earlier one that didn't show any DTC's that i'd noted and that seemed to run OK.

    Compared & altered a few things, nothing of much note, However, I found

    167ba : Max RPM for 0 bpw must be same with 167b4
    167b4 : Max rpm for 0 bpw
    set slightly different
    Although these WERE NOT the same on the working .bin either

    So it looks like this is the MAX RPM I can wind this motor unles Kur4o can do his magic here.

    15d20 : Max RPM for spark adv calc can be set much higher.

    I'll give it a run when I get a mo.

    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  5. #5
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    410

    Update:

    Nope I have/had a wiring Issue.
    Knock sensor DTC 43D flashing on & off
    Knock counts clocking over & over.

    I've spent 2 days chasing this down.
    Removed the PCM & checked Voltages & Ohmage on everything, checked out fine.
    Replace PCM , EEHack count goes mental, Fans on FULL etc
    Removed & tested. OK
    Replaced goes mental.

    Ran fine with PCM hanging out.

    I removed the PCM over a dozen times today.
    Every time I replaced it the knock counts re appeared.

    I know there IS a problem in the Knock Sensor cable now, just need to replace it.

    Oh the joys.
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  6. #6
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    sounds odd, a DTC 43 shouldn't clear itself until next reset. in such a failure condition the ECM should pull (by default) 9 degrees of timing advance across the board and ignore any further knock counts. the code shouldn't flash on and off.

    if you suspect a fault why not just pull the whole harness and load test every wire back to the ECM while you flex it a bit. it'll only take a few hours including re&re of the harness. a paper clip is a perfectly good probe for the ECM pins. you might have a bad ground splice or something, but also if one wire is damaged it's possible there are others next door.

  7. #7
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    410
    Quote Originally Posted by steveo View Post
    sounds odd, a DTC 43 shouldn't clear itself until next reset. in such a failure condition the ECM should pull (by default) 9 degrees of timing advance across the board and ignore any further knock counts. the code shouldn't flash on and off.
    There is a timer at 2807 to clear error 43 set at 50.00 (presume seconds)
    Fault code would go off pretty much as soon as I pulled the PCM out the bracket.
    Of course as soon as I pulled it, the fault disappeared.
    Knock counts could ramp up about 1-2000 counts each second
    43 &/or 43D would flash up. Timing would pull ( 5 in my tune) then decay.
    then it'd all go away for minutes.

    When I connected to the PCM this morning the DTC's appeared before starting the car

    if you suspect a fault why not just pull the whole harness and load test every wire back to the ECM while you flex it a bit. it'll only take a few hours including re&re of the harness. a paper clip is a perfectly good probe for the ECM pins. you might have a bad ground splice or something, but also if one wire is damaged it's possible there are others next door.
    That's a job for next week :-)

    Big thanks Steveo for EEHack, I probably wouldn't have found it without.
    Big thanks also to Gary Doug as well for his Scan9495 software if he's around on here.

    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

Similar Threads

  1. Help with eehack
    By davi3078 in forum Gear Heads
    Replies: 6
    Last Post: 01-14-2024, 05:51 AM
  2. DTC's and Output assembly code
    By turbo_bu in forum GM EFI Systems
    Replies: 0
    Last Post: 04-17-2017, 04:12 PM
  3. EEhack
    By Stroked 388 in forum Introductions
    Replies: 37
    Last Post: 02-25-2017, 08:29 PM
  4. EEHack target afr
    By Terminal_Crazy in forum GM EFI Systems
    Replies: 4
    Last Post: 12-04-2016, 06:17 PM
  5. Replies: 1
    Last Post: 04-13-2013, 06:49 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
  •