360 Wheel speed sensor, which one? | FerrariChat
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360 Wheel speed sensor, which one?

Discussion in '360/430' started by yelcab, Apr 28, 2025 at 4:39 PM.

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  1. yelcab

    yelcab F1 World Champ
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    Mitchell Le
    #1 yelcab, Apr 28, 2025 at 4:39 PM
    I am looking for the culprit that causes the Speedo on a 360 to go to zero and ASR on. I am unsure which of the four wheels is being used for speed calculation. Fright, Fleft, Rright or Rleft. And looking at the parts diagram, it looks like the ABS wheel speed sensor is integrated into the wheel bearing, which makes the $100 part into a $1100 part.

    So which one is it?

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  2. Qavion

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    #2 Qavion, Apr 28, 2025 at 5:10 PM
    Last edited: Apr 28, 2025 at 5:20 PM
    We have lots of conflicting information on this. The WSM says the RH rear (WSM section C4-03), but in another section, it says vehicle speed is derived from a diagonal pair. To add further confusion, someone on the forum said his LH rear caused an ABS and speedo issue.

    I suppose it's possible that the diagonal pair is only used in the brake ECU to compute ABS operation, but speedo uses only one sensor.

    What do you mean by "ASR on"? Speedo and ASR only?

    Just about every ECU on the car uses vehicle speed (including the Roof ECU on the Spider). To confuse the issue further, I recall that 360Trev said that all wheel speeds are transmitted on the CAN Bus.
     
  3. Qavion

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    #3 Qavion, Apr 28, 2025 at 5:27 PM
  4. yelcab

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    #4 yelcab, Apr 28, 2025 at 5:29 PM
    And that is why I asked. Which module is calculating the vehicle speed? Which wheel sensor data is being used in the calculation? Since it's $1,100 each, one just cannot change all four sensors?

    Vote 1: Right Rear sensor
    Vote 2: Diagonal pair (assuming RRear sensor and FLeft sensor)
    Vote 3: ?
     
  5. Qavion

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    #5 Qavion, Apr 28, 2025 at 5:49 PM
    But if you have anecdotal evidence conflicting with an often wrong WSM... who really knows.

    If Chapter C4.o3 is wrong, a diagonal pair could be Front Right/ Left Rear.

    Could you clarify which computers are reporting the issue? What lights do you have on?

    Maybe Rod at FAI knows? They fix the instrument panels.
     
  6. Qavion

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    #6 Qavion, Apr 28, 2025 at 5:51 PM
  7. flash32

    flash32 F1 Veteran

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    #7 flash32, Apr 28, 2025 at 8:03 PM
    Just connect the scanner to it and see which one is wrong when you're driving
     
  8. yelcab

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    #8 yelcab, Apr 28, 2025 at 8:07 PM
    Easy to say, because it is intermittent ...
     
  9. flash32

    flash32 F1 Veteran

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    #9 flash32, Apr 28, 2025 at 8:19 PM
    Ok .. maybe take a ride and graph all abs data and see if it pops
     
  10. Qavion

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    #10 Qavion, Apr 28, 2025 at 10:48 PM
    The ECU is supposed to log individual wheel speed sensor faults. Is an SD2 tool required to read these particular faults?
     

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