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ABS and anti-skid ecu problem

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by ilya980, Feb 6, 2022.

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  1. ilya980

    ilya980 Junior Member

    Joined:
    Nov 3, 2020
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    Location:
    Massachusetts, USA
    Vehicle:
    2013 Prius c
    Model:
    One
    I opened the sensor. Here are the photos. The sensor cover (rectangular piece inside) looks good, but I noticed a streak of rust going down from the sensor. On the opposite side there is a small dent. I think it is designed by the manufacturer based on photos I found online.

    The bearing looks questionable to me. First, the white grease is chunky and has orange stuff mixed in. Some of it got stuck behind the magnetic wheel, as you see on the photo. I am not sure how easy it should spin, but it does not spin really easy. It would be great if I had a new part or at least a video someone spinning it.

    Yes, it still could be ECU or intermittent wiring problem, but it looks unlikely.

    Does this bearing look bad? It has no free play, but chunky grease and mixed black stuff is a concern.

    How do I check the sensor? Is there a resistance spec for it?

    The options are 1) clean and re-grease the bearing; 2) replace the sensor and 1); and replace the assembly.

    Thanks.
     

    Attached Files:

    #21 ilya980, Mar 6, 2022
  2. ChapmanF

    ChapmanF Senior Member

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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    My choice would be replace the assembly, and be done with it.

    The issue being reported by the ECU probably had less to do with the resistance of the sensor coil, and more to do with the chunks of metal riding around on the magnet.
     
    #22 ChapmanF, Mar 6, 2022
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    My suggestion would be to replace the assembly, and the connector "pigtail" for it. I have seen erratic sensor codes on similar age Toyotas that was caused by slight corrosion of the connector terminals.

    These are "magneto resistive" sensors. The sensor itself is a bit of electronics that reads the weak magnetic material (the brown rubber stuff- aka the tone ring) that's on the bearing. As the bearing turns, the sensor sends a digital signal to the ecu. (The sensor changes the amount of current it uses). It's sort of like a Hall effect sensor- if it had a little cousin.

    Short form is that directly testing the sensor or the tone ring requires some specialized gear. Replacing parts is a reasonable diagnostic path for this type of fault.

    Posted via the PriusChat mobile app.
     
    #23 mr_guy_mann, Mar 12, 2022
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