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2019 tundra bunch of errors, ? Can bus

Discussion in '2nd Gen Tundras (2007-2013)' started by sarcomere, Sep 14, 2023.

  1. Jul 9, 2024 at 3:08 PM
    #31
    sarcomere

    sarcomere [OP] New Member

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    @Jeff_5_7 canh and canl are both fixed at 4.156V and only fluctuate .003V. No continuity with ground on either line.
     
  2. Jul 9, 2024 at 4:30 PM
    #32
    Jeff_5_7

    Jeff_5_7 New Member

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    Houston Tx Area
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    2007 RCSB 2014+ TRD Pro Conversion 5.7 4x4
    Full 2014+ Conversion Regular Cab Short Bed 4X4 2019 TRD Pro Grill, 2014+ Front End Swap 2014+ Interior/Dash Swap with TRD Pro Leather Seats, 2014+ Bed Swap with TRD Pro Stamping SOS 2/4 Drop Kit
    Interesting, I was expecting 2.5V on each line. My bench setup is 2.5v and drops down to 2.3v when a messages comes. This is from a 2020 ecu network.

    I feel like the 4.156v is high.

    Are you still also not getting communication from the ABS ecu? You said no speedometer operation
     
  3. Jul 9, 2024 at 5:56 PM
    #33
    sarcomere

    sarcomere [OP] New Member

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    @Jeff_5_7 I’ll have to look into the higher voltage. ABS did not give an error in the can bus check on techstream, but I didn’t check it any other way. I do not have speedometer, but I previously did before I started messing with things trying to figure out the problem. Not sure why it stopped working, but I think it happened after I unplugged the gateway trying to figure out the problem. I tried a loaner gateway to see if that would work, but had the same issues.

    Do you think it still might be a sensor short? Do most of the engine sensors get to the ecm on the d74 connector. If I remove that and keep A24 connected to see if I can communicate with the ecm through techstream?

    I tried removing fuel ecu connectors near the back of the truck but it didn’t change, with the car still able to run fine, I can’t imaging it being a critical sensor.

    also, could the parasitic draw from alt-s and the elevated can bus voltage be related? I still have the alt-s fuse removed which stopped the draw yet the battery seems to charge fine.
     
  4. Jul 10, 2024 at 1:57 PM
    #34
    Jeff_5_7

    Jeff_5_7 New Member

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    Full 2014+ Conversion Regular Cab Short Bed 4X4 2019 TRD Pro Grill, 2014+ Front End Swap 2014+ Interior/Dash Swap with TRD Pro Leather Seats, 2014+ Bed Swap with TRD Pro Stamping SOS 2/4 Drop Kit
    Are you sure it is the AltS fuse then?
     
  5. Jul 10, 2024 at 7:06 PM
    #35
    sarcomere

    sarcomere [OP] New Member

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    @Jeff_5_7 I pulled fuses until the draw went away and alt-s worked. It use to drain my battery in a few days, with the fuse out I no longer have the battery drain, but it still seems to charge fine. Voltage is one thing that works on the gage cluster and it sits right in the middle with the truck running.

    Should I maybe plug it back in and try other fuses?

    Thanks!!
     

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