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Thread: Neurotic EAS

  1. #11
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    247
    @Saulman the abs sensor have no influence on the vehicle suspension afaik. Perhaps at most road speed is measured from the abs sensors but that should not cause anything to happen like this. Sensors that are not seated properly or too much dirt in the reluctor ring (mixed with braking dust that contains metal particles) can cause these errors. Also reluctor rings can break but that is not likely. Not sure as to why it would only happen on full lock though. Try reseating the sensors and checking for dirt on the reluctor rings. Be carefull with using a pressure cleaner in that area because you can actually blow dirt into the seals and that's an entire new headache when that happens

    Keithy is of course 100% correct: grounding is detected when the sensors go past the max target value. This can happen with faulty sensors but is less common. Whilst driving the car could rise into extended mode but only when the speed is below 50kph.

    private is also right in that there is a number of value's that need to be satisfied for the eas to move, either up or down. so again, a car that raises when parked is quite impossible because the engine speed input should be 0. afaik this is usually measured in pulses so a faulty contact should not be able to "fool" the eas that the engine is running so I tend to think that the problem should exist elsewhere.

    -P

  2. #12
    Join Date
    Dec 2017
    Location
    Mornington Vic
    Posts
    69
    Hight sensor must be the villain. Rosie did the raising thing 3 times in a 15min drive last weekend but not at all when locked in hwy mode. Must be a worn area on a height sensor giving random numbers.
    At 350k its probably prudent to change all four.
    Sighs heavily......
    Mjs

  3. #13
    Join Date
    Jun 2018
    Location
    NZ
    Posts
    11
    I think they're just relatively standard carbon-based potentiometers so it's unsurprising that one (or more) have worn in that time.

    If you wanted you should be able to identify which one is faulty even with a normal multimeter; there are four analog inputs from the sensors to the EAS ECU located under the passengers seat, I believe these are pins 2,3 (left rear, left front), and 22 and 23 (right rear, right front). These points should show a voltage between ~1v - <5v and they should all be approximately the same. If one is substantially different, or if the course of a short drive (or even just moving the car up and down while stationary) you get an intermittent or erroneous reading it's likely that's the faulty unit. If perchance you had a 'scope this would be much superior to a meter, but it's not essential IMV.

    Also, FWIW, if you can identify the faulty sensor I believe you may be able to swap the units around in order to get them to use a different part of the carbon track and therefore get a new lease of life, but I've not tried this.

    Personally I would change the sensor type completely, but that's another story!

    All of this from first principles, others with specific experience may be able to give a more accurate view...
    Last edited by private; 18th July 2018 at 07:46 AM. Reason: slight spelling clarification

  4. #14
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    247
    You can swap them over and it will work, but usually the problem returns quite soon.

    Measuring the potmeters is best done by disconnecting them from the car and place an analogue meter on the leads, this way any change will be visible right away. Digital units are often to slow for this purpose.

    I replaced mine with a new set from spain, reasonably priced and the job is quite easy. Just make sure you do not damage the rubber on the suspension itself. No matter if you break the sensor or bend an arm, they are provided in the new set

    Cheers!

    -P

  5. #15
    Join Date
    Dec 2017
    Location
    Mornington Vic
    Posts
    69
    Quote Originally Posted by prelude View Post
    You can swap them over and it will work, but usually the problem returns quite soon.

    Measuring the potmeters is best done by disconnecting them from the car and place an analogue meter on the leads, this way any change will be visible right away. Digital units are often to slow for this purpose.

    I replaced mine with a new set from spain, reasonably priced and the job is quite easy. Just make sure you do not damage the rubber on the suspension itself. No matter if you break the sensor or bend an arm, they are provided in the new set

    Cheers!

    -P
    Rosie doesn't behave as much in hwy mode. Must have a bad spot on a sensor.
    Meh. Makes my life interesting.....until I try to get under the garage rollerdoor in extended mode....nearly got me the other day. Haha.

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