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653.78 ft/s2 - Implausible Wheel Acceleration Left Rear Wheel Circuit

Discussion in '2nd Gen Tundras (2007-2013)' started by OccamsRazor, May 20, 2023.

  1. May 20, 2023 at 11:22 AM
    #1
    OccamsRazor

    OccamsRazor [OP] New Member

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    Hello All,

    Working on a 2007 Tundra TRD 4x4. Initial complaint was that the following lights were lit up like a Christmas tree on the dash.

    VSC Off - Flashing
    Traction Control - Steady On
    4HI - Flashing
    4LO - Flashing
    ABS - Steady On

    Code reader indicated a bad left rear wheel sensor. Simple enough right? Ah... But no good deed can ever go unpunished. :facepalm:

    Replaced wheel sensor after a bit of artful drilling, (how does plastic RUST to a steel bearing housing! :mad:).
    IMG_20230506_142019.jpg

    Different Code now. Bad left rear wheel CIRCUIT...

    Consulted the Oracle. Back under the truck. Found this, (which is supposedly common?), up above the fuel tank.

    IMG_20230506_173743.jpg

    Spliced the wires and added a new waterproof connector to BOTH wires on the left hand rear sensor.

    Code Reader can now see and detect the sensor and Wheel Speed is indicating correctly BUT...

    Screenshot_2023-05-20-11-42-12-26_d445454384831f8cac9d9753f40be693.jpg
    Any ideas how to fix this? :monocle:

    The ABS/VSC/4WD is obviously freaking out because it thinks I am spinning a tire but...

    BTW The sensor I replaced is a $200 CarQuest Sensor from Advance Auto Parts. Not a cheap Chineseium sensor from Amazon... Definite difference between the 2.
     
  2. May 20, 2023 at 11:43 AM
    #2
    landphil

    landphil Fish are food, not friends!

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    Are you able to confirm that the new sensor is indeed correct for the left side? There is a difference between left and right, if you weren’t aware, as they are able to read the direction of rotation as well as speed.

    Also, is the new sensor “bolt flange” seated flat against the steel housing? Any rust build up holding the sensor out from fully seating can give a weak or incorrect signal, and it doesn’t take much sometimes.

    How far / fast have you driven since repairing the wiring?

    How does the RR speed / acceleration data compare to the RL?
     
  3. May 20, 2023 at 1:03 PM
    #3
    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    Lift the truck and check wheel bearings for excessive play/wear by hand. Worn bearings have bad effects on the sensors due to the tone ring to sensor distance variations that result from the worn bearings.
     
  4. May 20, 2023 at 1:05 PM
    #4
    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    BTW, please post what you find out for the next person to reference when they get into the same predicament.
     
  5. May 20, 2023 at 1:06 PM
    #5
    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    Welcome to the forum from OKC!
     
  6. May 20, 2023 at 2:51 PM
    #6
    OccamsRazor

    OccamsRazor [OP] New Member

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    The sensor is correct for the Left Side as the Right Side will not fit on the left. (the wire connector points in the wrong direction.)(Carquest Premium ABS Sensor ARC1128) (I also had a cheap Amazon special sensor that the owner purchased and it gives exactly the same readings.)

    The sensor is completely seated. I brushed the rust off with a brass brush and further scraped the surface with a gasket scraper to make sure the seating surface was flat, clean and pristine. The hole where the sensor fits is clean and dry. Removed the sensor to check and no evidence of rubbing or interference of any kind.

    There are no errors on the dash and no codes upon initial start. The error, (and Christmas lights), come back immediately upon reaching 30 mph, (as the Toyota Manual indicates they will as that is how fast you have to be moving for the ABS circuit to self-calibrate)

    If you key off and then key on again the Christmas Lights are off. The error, (and Christmas lights), come back immediately upon reaching 30 mph, (again... The speed the ABS freaks out at according to Toyota if it notices a discrepancy).

    I have driven more than 5 miles after the wire repair.

    >>How does the RR Speed / acceleration date compare?<<

    Left & Right Wheel Speed's are close to identical. 37.33 mph.

    Left Rear Wheel Acceleration = 653.8 ft/s2.
    Right Rear Wheel Acceleration = 14.44 ft/s2.

    Screenshot_2023-05-20-17-26-58-57_d445454384831f8cac9d9753f40be693.jpg
     
  7. May 20, 2023 at 2:53 PM
    #7
    OccamsRazor

    OccamsRazor [OP] New Member

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    Checked that initially. Wheel bearing makes no noise, has no play and no signs of discernible wear.
     
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  8. May 20, 2023 at 3:28 PM
    #8
    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    Have you checked all four?
     
  9. May 20, 2023 at 4:06 PM
    #9
    OccamsRazor

    OccamsRazor [OP] New Member

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    Yes. I just rechecked all four and no signs of noise or movement.
     
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  10. May 20, 2023 at 6:27 PM
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    landphil

    landphil Fish are food, not friends!

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    Hmm. Are you certain the wiring was reconnected to the same polarity as it originally was? These sensors are polarity sensitive. If you’re not sure, I’d attempt to swap it and give it a try.

    Do you know of any history of wheel bearing replacement?

    The tone wheel within the rear wheel bearing is magnetic, and any filings stuck to it can also wreak havoc on getting a clean signal from the sensor. I’ve never attempted this on a 2nd gen, but I wonder if you couldn’t pull the sensor, and clean the magnetic tone ring with a cotton swab while spinning the axle.
     
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  11. May 20, 2023 at 11:50 PM
    #11
    OccamsRazor

    OccamsRazor [OP] New Member

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    Will try the polarity swap in the morning.

    No idea on the bearing replacement.

    Will try an additional cleaning of the tone ring surface.
     
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  12. May 21, 2023 at 9:21 AM
    #12
    OccamsRazor

    OccamsRazor [OP] New Member

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    Welp... Polarity is not the issue. Swapped the wires and then it REALLY freaked out. Sensor not found. C1333 - Open Circuit In Left Rear Speed Sensor Circuit. Put the wires back to the original orientation and am now back to C0215 Rear Speed Sensor LH Circuit.

    On to cleaning...
     
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  13. May 21, 2023 at 11:20 AM
    #13
    OccamsRazor

    OccamsRazor [OP] New Member

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    Cleaned the ring... No change.

    Read on other Toyota forums that sometimes the connector gets corroded. Ohm'ed out the connector after cleaning it with DeOxit... No change.

    Replaced the harness from the sensor to the plug below the tank. (Thereby bypassing the sensor connector plug and all of the harness wiring completely). No change.

    Soo... It is looking like a bad wheel bearing/ABS ring. Which I do not have the equipment to replace...:eek:
     
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  14. May 21, 2023 at 11:31 AM
    #14
    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    Considering the age of your truck, if you have put over 80,000 or so on it yourself without bearings, then replacing them is simply a good thing all the way around. That said, I think you might have a bad abs module or similar. You might try to closely inspect and clean all the sensors and tone ring surfaces just to be sure before you start throwing money at it. I sure miss them old Ford's from the 70's without all the electronics and plastic crap!
     
  15. May 21, 2023 at 1:04 PM
    #15
    OccamsRazor

    OccamsRazor [OP] New Member

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    80,000?! o_O

    IMG_20230521_154037.jpg

    Thankfully this is not my truck. Thing looks nice on the outside but it rusty as heck underneath...

    As for cleaning the tone rings there is a special place in heck for the Toyota engineer that designed the ABS Tone Ring assembly of this truck with no way to access it or even see it!
     
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  16. May 21, 2023 at 2:00 PM
    #16
    TheBrit

    TheBrit Wrinkly member

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    I was under the impression that splicing wires that carry sensor 'readings' make the baby Jesus cry.
     
  17. May 21, 2023 at 3:13 PM
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    2mchfun

    2mchfun Yeah it'll pull it, just don't expect to stop!

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    As for the tone ring engineering, look no further than the starter location. :annoyed:
     
  18. May 22, 2023 at 7:41 PM
    #18
    OccamsRazor

    OccamsRazor [OP] New Member

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    Yes. Supposedly the resistance values can be a problem but in this case baby Jesus will have to wail as the wires that were damaged are at the connector on the main loom side. No way to replace them so a splice would have to do.

    Starter location. Transfer case actuator. ABS sensors. What else did Toyota design to torture those who dare to repair these vehicles?
     
  19. May 22, 2023 at 8:39 PM
    #19
    Jeff_5_7

    Jeff_5_7 New Member

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    What are the chances the faulty wiring damaged the abs ecu? Have you tried removing all power from the abs ecu to let it hard reset?

    Odd that speed works but acceleration is crazy. The pulses from the tone rings are reported to the abs ecu. It is what stores the codes, does the calculations ect.

    Worth a shot to unplug the Abs or remove the battery for a while and see if it resets.

    What is the actual code in the abs ecu? What scanner are you using to read it?
     
    Last edited: May 23, 2023
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  20. May 25, 2023 at 4:56 AM
    #20
    OccamsRazor

    OccamsRazor [OP] New Member

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    One of the other things wrong with this truck was a loose and corroded negative terminal. Replaced both terminals so the battery was disconnected and all modules reset. This was done after the above repairs soo...
     

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