Help with dead ecu’s after tune - issue located

Discussion in '4Runners' started by NorthPark, Aug 4, 2023.

  1. Jan 11, 2024 at 5:15 AM
    #21
    Gfunk4399

    Gfunk4399 Member

    Joined:
    Jan 10, 2024
    Member:
    #441370
    Messages:
    13
    Gender:
    Male
    Vehicle:
    2017 Tacoma TRD off road and 2013 4runner
    None yet
    You might have a bad pin in the plug. Have you tested pins where they plug into ECU? Did you use correct year ECU for your model and options? I know ECUs in my older ones would not interchange year to year. Just throwing stuff on the wall from past experience. Toyota changed eletronics every year. Just a thought of a past problem I had.
     
  2. Jan 13, 2024 at 7:53 AM
    #22
    NorthPark

    NorthPark [OP] Well-Known Member

    Joined:
    Aug 24, 2020
    Member:
    #338695
    Messages:
    62
    Vehicle:
    Procharged 4r

    I figured it out after tracing the entire ECU circuit, 2 bench top programmers and a few ECM's. Needless to say, reach out to me if anyone thinks they have a 1gr-fe ECM failure as I think I have a pretty good understanding of the 4runner harness now. Keep in mind there were -no- trouble codes, there was zero response from the ECM.

    The problem was actually with the 5v circuit bank 1. The Procharger intercooler plumbing has no brackets and is not secure, so under certain conditions it would shift and crush the VVT sensor on top of the valve cover, shorting out the ECM and making it appear as if it failed.

    This would happen during initial test drive after flashing it via hp tuners and the Procharger tune. It would run fine for a while idling and putting around verifying the fuel/spark/etc, then at some point the 4r would just go into total failure mode.

    I figured it out after fully understanding the ECM pins (power and can pins). I found that I had a good CAN signal at the ECM header and the ECM's were reachable on my desktop programmer. Then started off with only the necessary plugs in the 4r, plugging in the rest one at a time until it failed.

    If I ever get the Procharger running correctly, I'm going to weld brackets onto fuel pump clamps and then use those to secure the intercooler plumbing for off-road.
     
    Last edited: Jan 13, 2024
    Too Stroked likes this.
  3. Apr 13, 2024 at 10:32 AM
    #23
    TacoElmo

    TacoElmo New Member

    Joined:
    Apr 13, 2024
    Member:
    #447835
    Messages:
    1
    Vehicle:
    97 Tacoma 2.4L
    What was the issue in the end causing all those ECU’s to get fried?

     
  4. Apr 13, 2024 at 12:17 PM
    #24
    NorthPark

    NorthPark [OP] Well-Known Member

    Joined:
    Aug 24, 2020
    Member:
    #338695
    Messages:
    62
    Vehicle:
    Procharged 4r
    a section of the intercooler tubing was shifting and shorting the vvti sensor that sits on top of the valve cover passenger side towards the front.

    I figured out which pins powered/grounded the ecu and had CAN communication. Unplugged all other harnesses from the ecu and then it was just process of elimination. The harness which shorted the ecu, once I reconnected it, had 2-3 sensors in its circuit.
     
    Last edited: Apr 14, 2024

Products Discussed in

To Top