1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Ask the Toyota mechanic!

Discussion in 'General Tundra Discussion' started by T-Rex266, Aug 15, 2015.

  1. Nov 21, 2020 at 6:54 PM
    #1861
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,560
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Complicated question... so, I have a 93 1uz sc400 found a good 95 1uz sc400 ecu... difference in the ECU is the 95 has heated oxygen sensors 93 does not.. my question is.. could I strip the wiring out of the donor car and repin it into the newer ECU and my car with the new sensors?? So I don't have a permanent CEL.. it's a straight swap with my car, but that's the only hang up.. unless I could figure out the heater pin and jump it or ground it to evade the CEL.. but my harness does not have that wire...

    I will have my ECU rebuilt, but I'm still short for now..
    Thanks in advance...
     
  2. Nov 21, 2020 at 7:55 PM
    #1862
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    Does the 95 ecu have the same terminal connectors? Will it plug into the 93 harness? If it does and you know what terminals on the 95 ecu are for the heated O2 you may be able to fool the ecu if you know the resistance of the heater in the O2 sensor.
     
  3. Nov 21, 2020 at 8:19 PM
    #1863
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,560
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Yes, it's a straight swap... that's what I was thinking in clipping the harness end with the oxygen sensors harness intact so I could just remove the pins from that harness and add them to mine by either repin it or like you said fool the ECU via a resistor
     
  4. Nov 21, 2020 at 8:36 PM
    #1864
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR

    Repining the 93 harness would work. How many O2 sensors does the 95 use? Any chance you could get the O2 sensors out of the 95 then swap them into the 93? You could just run wiring down to the O2s from the repined connector. If you could get it working no need to have the 93 ECU repaired.

    Are you absolutely sure are the terminal pins on the 93 and 95 are configured exactly the same except for the O2 heaters? Could be a costly mistake if they aren't.
     
    blackdemon_tt[QUOTED] likes this.
  5. Nov 21, 2020 at 8:42 PM
    #1865
    Tundracontent

    Tundracontent New Member

    Joined:
    Oct 22, 2020
    Member:
    #53957
    Messages:
    9
    Gender:
    Male
    You are so right. I have a 2020 TRD sport CM with no modification. I am averaging 17 mpg in the city with every recommendations you have listed.
     
  6. Nov 21, 2020 at 8:52 PM
    #1866
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    That very good for city driving. I always measure my mpg on the highway. I don't even look at the mpg with city driving. There are just too many variables. I usually see 21mpg on the flat and if I keep my speed at 65mph. A friend of my has a 2018 Platinum 4X4 CM and he sees the same mph. Mines a 2020 SX 4X4 DC.
     
    NewImprovedRon likes this.
  7. Nov 21, 2020 at 10:04 PM
    #1867
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,560
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Right now I'm about 90% sure they're the same for the exception of the heated oxygen sensor. I will continue to research thoroughly before I swap them.. did find a PCM pin readout that is for 92-95 since they're OBD1, but will go down pin for pin to verify... it has 2 oxygen and 3 post cat oxygen sensors
     
    Ruggybuggy[QUOTED] likes this.
  8. Nov 22, 2020 at 2:55 AM
    #1868
    Bradleybb

    Bradleybb New Member

    Joined:
    Jul 19, 2020
    Member:
    #49548
    Messages:
    170
    Gender:
    Male
    Georgia
    Vehicle:
    2021 CM TRD OR
    Transmission cooler TRD REAR SWAY RCI front skid
    Thank you
    Will get pictures of it and post to thread
     
    Ruggybuggy[QUOTED] likes this.
  9. Nov 25, 2020 at 6:55 PM
    #1869
    the ER kid

    the ER kid New Member

    Joined:
    Oct 7, 2020
    Member:
    #53246
    Messages:
    93
    Vehicle:
    2020 Platinum Crewmax
    A1A2D45A-5D48-4235-9709-FADCD4FCE797.jpg F6B45B82-1D93-446E-AC75-D1F9335286B7.jpg

    I started a thread with this question figured I would also ask here. I have a 2020 Tundra Plat 2WD. While installing the TRD skid plate I had to remove this piece. Is that correct?
     
  10. Nov 25, 2020 at 7:03 PM
    #1870
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    I've never installed the TRD plate on a 2wd but on the 4WD nothing is removed. Where did you remove that from?
     
    NewImprovedRon likes this.
  11. Nov 25, 2020 at 7:05 PM
    #1871
    Vizsla

    Vizsla ☠️☠️☠️

    Joined:
    Jul 14, 2016
    Member:
    #3867
    Messages:
    2,574
    Yes.
     
  12. Nov 25, 2020 at 7:09 PM
    #1872
    the ER kid

    the ER kid New Member

    Joined:
    Oct 7, 2020
    Member:
    #53246
    Messages:
    93
    Vehicle:
    2020 Platinum Crewmax
    Lower portion of bumper attaches and has two bolts between the tow hooks
     
  13. Nov 25, 2020 at 7:10 PM
    #1873
    the ER kid

    the ER kid New Member

    Joined:
    Oct 7, 2020
    Member:
    #53246
    Messages:
    93
    Vehicle:
    2020 Platinum Crewmax
    Thank You. Just wanted to make sure.
     
  14. Nov 25, 2020 at 7:12 PM
    #1874
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    Looks like you got your answer. Where I live no one has a 2wd Tundra and the dealer has never sold one off the lot.
     
    Last edited: Nov 25, 2020
    NewImprovedRon likes this.
  15. Nov 25, 2020 at 7:13 PM
    #1875
    the ER kid

    the ER kid New Member

    Joined:
    Oct 7, 2020
    Member:
    #53246
    Messages:
    93
    Vehicle:
    2020 Platinum Crewmax
    Wow. That’s surprising. Would you expect anything less from Florida? Haha

    Thanks for y’all’s help
     
    Ruggybuggy[QUOTED] likes this.
  16. Nov 26, 2020 at 7:17 AM
    #1876
    Eaganite

    Eaganite New Member

    Joined:
    Apr 5, 2020
    Member:
    #44669
    Messages:
    393
    Gender:
    Male
    First Name:
    Gary
    Eagan, Minnesota
    Vehicle:
    2020 Limited TRD
    I just discovered @Ruggybuggy is doing the "ask-the-toyota-mechanic" thread. Have read many of your responses on various threads, and am glad to find this one. Thanks for sharing your time and knowledge with the forum members, a great benefit for all. Glad to read your recovering from the surgeries!

    Best,
    Gary
     
  17. Nov 26, 2020 at 7:43 AM
    #1877
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    Thank you very much for the kind words and happy Thanksgiving to you and your family.
    Stay safe.
     
  18. Dec 3, 2020 at 7:15 AM
    #1878
    Green Thunder

    Green Thunder Smooth in the Cruise

    Joined:
    Oct 22, 2019
    Member:
    #37701
    Messages:
    7,161
    Washington
    Vehicle:
    2020 Burnt Green TRD Pro
    Food crumbs and dog fur
    @Ruggybuggy - So the forum has a "general consensus" that doing a transmission flush on higher mileage trucks (say over 100,000) is a bad idea. Can you shed some light on this? Is it true or internet folklore? Some seem to suggest it's a bad idea if the fluid has never been changed vs. mileage based.
     
  19. Dec 3, 2020 at 9:00 AM
    #1879
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    It all depends on what type of flushing machine is used. The theory is that crude that has acumulated in the transmission can be dislodged and find it's way into places that it shouldn't be causing issues. Many transmissions flush machines use their own pump to exchange the fluid and in rare cases it can cause an issue. The flush machine that uses the transmissions pump to exchange the fluid won't cause an issue. Basically the outlet line to the cooler goes to the flush machine. As fluid enter the machine it enters a cylinder that has a sealed diaphram that moves and pushes new atf fluid out of the machine back to the transmission. This type of flush machine will not harm the transmission but finding a shop that has one can be tough.
    So making a long story short, dump and fill is your best bet.
     
  20. Dec 3, 2020 at 9:18 AM
    #1880
    Green Thunder

    Green Thunder Smooth in the Cruise

    Joined:
    Oct 22, 2019
    Member:
    #37701
    Messages:
    7,161
    Washington
    Vehicle:
    2020 Burnt Green TRD Pro
    Food crumbs and dog fur
    Fascinating, thanks for the info. So I assume if you're getting your tranny flushed on a semi-regular basis there's nothing to worry about as each one should help keep the crude from getting bad?
     
  21. Dec 3, 2020 at 10:09 AM
    #1881
    Bprose

    Bprose Old member

    Joined:
    Jan 15, 2017
    Member:
    #5955
    Messages:
    1,311
    Gender:
    Male
    VA
    Vehicle:
    17 Tundra CM TRD

    I bought an old 95 4Runner w 200k miles on it. Did a machine flush and trans slipped a bunch. Did 2 drain and fills w filter and it was fine after that. My buddy who is a mechanic told me don’t do machine flush anymore and so far so good. Only drawback with the tundra is no trans dipstick, so be easy way to fill or check fluid level.
     
    Green Thunder[QUOTED] likes this.
  22. Dec 3, 2020 at 11:01 AM
    #1882
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    I would still be leery of any flush machine that has it's own pump to exchange the fluid. The chances are low that something would happen but transmissions are expensive.
     
  23. Dec 6, 2020 at 11:03 AM
    #1883
    13tundradude

    13tundradude New Member

    Joined:
    Jul 9, 2020
    Member:
    #49051
    Messages:
    52
    Gender:
    Male
    LOS ANGELES
    Vehicle:
    2012 TUNDRA
    2013 4.6 ENGINE AND TRANS. COUPLED WITH A 5.7 REAR END LSD
    Good morning, I have swapped out the 5.7 engine transmission from a 2013 for a 4.6 engine and transmission. The truck starts via starter but wont run due to the ews which we think runs thru the trans, to the ews system.

    Could this be the issue? Is it possible to flash the ECU or TCU? Is it another problem?

    all contacts are grounded and connected.
     
  24. Dec 6, 2020 at 11:49 AM
    #1884
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    It's not something that's done at the dealership level so I'll very little experience with this. There are no software changes that I know of that would change the fuel mapping and transmission software. The ECU and TCM are one module. If the pin outputs on the harness and ECU are the same between the 4.6 and 5.7 it might be easier to use the 4.6 ECU but you will have to visit the dealer to have the VIN written to the new 4.6 ECU. Do you have a way to read codes?
    I'm not sure what you mean by ews?
     
  25. Dec 6, 2020 at 1:18 PM
    #1885
    13tundradude

    13tundradude New Member

    Joined:
    Jul 9, 2020
    Member:
    #49051
    Messages:
    52
    Gender:
    Male
    LOS ANGELES
    Vehicle:
    2012 TUNDRA
    2013 4.6 ENGINE AND TRANS. COUPLED WITH A 5.7 REAR END LSD

    ECM is the same, firing order the same on 5.7, & 4.6.

    I apologize for the confusion, ESW is a BMW term for the immobilizer.

    My main concern is the immobilizer, mapped out the immobilizer from what I can see runs from the ignition switch to the immobilizer relay then to the transmission, fuel system, and ignition coils.

    Am I looking at the immobilizer mapping correctly?
     
  26. Dec 6, 2020 at 2:25 PM
    #1886
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    The imobizer shouldn't come into play if all the modules are the same. A transmission and engine swap shouldn't effect the immobilizer. If you can scan and see what codes are present that would help diag what is going on.

    You can't assume the ecu is the same because the firing order is the same. The software in the ecu would be different because the fuel mapping would be different.
     
    Last edited: Dec 6, 2020
    13tundradude[QUOTED] likes this.
  27. Dec 6, 2020 at 11:39 PM
    #1887
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,560
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Lol, continuing the PCM questions.. got my hands on 2 different pinouts for my ECUs.. 93 sc400 vs 95 sc400. It is about 90% compatible... the connector was renamed, similar pinouts and connectors, but I've noticed 3 systems appear to have been removed or added, 1 was moved sorta or swapped... 1 added trans O/D clutch, 1 removed cold injection start, 1 moved trans speed sensor. Now the EGR appears with resistance that is slightly different, mine is 10 to 30 while 95 is 19.0 to 23.3 I could say it should work over as it sits within the range... 4 added pins for heated O2 sensors.. the O/D clutch can be attached to a resistor as to prevent it from flashing constantly.. although most issues have been alleviated for now.....
     
  28. Dec 7, 2020 at 6:19 AM
    #1888
    Ruggybuggy

    Ruggybuggy Seasoned Veteran

    Joined:
    Sep 23, 2019
    Member:
    #36508
    Messages:
    3,142
    Gender:
    Male
    First Name:
    Dave
    NW ON, CANADA
    Vehicle:
    2016 Tundra OR
    I'm not trying to be a smart ass but your going to be very lucky if you can get it to work without it throwing codes and a CEL coming on. I take it that you have installed it and the car runs? You need a way to read trouble codes. Address the codes that come up as they appear. I wish you luck.
     
  29. Dec 7, 2020 at 9:50 AM
    #1889
    blackdemon_tt

    blackdemon_tt Battery Slayer

    Joined:
    Feb 27, 2020
    Member:
    #43241
    Messages:
    2,560
    Gender:
    Male
    Vehicle:
    2007 5.7l Tundra DC SR5 long bed 2wd
    TRD Sway Bar, Roll covers USA bed cover
    Yes, lol.. everything appears to work appropriately I am waiting on codes as I'm still running parking spot checks.. not braving a trial and error run too far away from the edge of the pool just yet.
    Thank you for your help
     
    Ruggybuggy likes this.
  30. Dec 7, 2020 at 12:17 PM
    #1890
    Green Thunder

    Green Thunder Smooth in the Cruise

    Joined:
    Oct 22, 2019
    Member:
    #37701
    Messages:
    7,161
    Washington
    Vehicle:
    2020 Burnt Green TRD Pro
    Food crumbs and dog fur
    Next question around internet rumors/knowledge. The fuel pump...

    Much wailing and gnashing of teeth around Toyota's poor Distance to Empty vs. the amount of fuel left in the tank. Most feel (and this is true on all the forums I've been on) a few gallons are needed to help cool the fuel pump. But a few folks have suggested the cooling is not from being surrounded by fuel, but rather from fuel traveling through the pump. This all plays into the "if you run it dry, the pump might overheat" idea.

    So what are your thoughts @Ruggybuggy?
     
To Top