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P38A Front Wheel ABS Speed sensors

Discussion in 'Range Rover' started by awkwardbob, Jan 29, 2021.

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  1. wil2813

    wil2813 Well-Known Member

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    Hi al
     
  2. tomcat59alan

    tomcat59alan Well-Known Member

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    Hi mate,where have you been hiding? Self isolation doesn't include the forum.;):D
     
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  3. wil2813

    wil2813 Well-Known Member

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    Lol can’t believe it’s been that long from last post but a message popped up from here so I’m back.serious career changes in recent years but fire away if anyone needs help hope everyone here is good & healthy
     
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  4. tomcat59alan

    tomcat59alan Well-Known Member

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    Retired, lottery win??;)
     
  5. wil2813

    wil2813 Well-Known Member

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    I wish
     
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  6. tomcat59alan

    tomcat59alan Well-Known Member

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    Kept man then? Don't know where the time has gone,just watched the news and it was a year since they brought the evacuees from China to the local hospital for isolation. :eek:
     
  7. wil2813

    wil2813 Well-Known Member

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    I know al I sold my tyre buisness & was working as road crew for all the well known celebrity artists that obviously all went wrong in March last year now I’m a Vehicle technician/Dvsa mot tester strange world
     
  8. tomcat59alan

    tomcat59alan Well-Known Member

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    Hopefully we'll get back to something resembling normality soon,stay safe.
     
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  9. kds

    kds Well-Known Member

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    16 volts at the battery measured with a meter is still a bit high.
     
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  10. Grrrrrr

    Grrrrrr Technician, Bodgit & Scarper Ltd Full Member

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    I cannot remember. I seem to have trouble remembering the simplest things these days. @Henry_b probably knows.
     
  11. Henry_b

    Henry_b O Shizzle Gzngahr

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    Anything from 0.5 to 2000Kohms others go higher which is what my cheapo meter reads ;)

    Easiest test OP can do is to measure the resistance of the sensors. The faulty one is the one that reads differently to the others and will probably be open circuit. They are only a coil so a break means they don't work. ;)
     
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  12. awkwardbob

    awkwardbob Well-Known Member

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    Hi,I’ll do that. need to ease the old lady through her MOT so doing the front brakes.
    Have ordered a couple of new bushes and will check the fuses and relay.


    Are the connectors from the sensors easy to locate on the underside or in engine bay ?

    thanks again !

    Bob
     
  13. tomcat59alan

    tomcat59alan Well-Known Member

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    Just follow the wires back,from memory the plugs are in the engine bay ,inner wing.
     
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  14. Karlos the jackal

    Karlos the jackal Well-Known Member

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    I'm sure mine tested that not so long ago but like you my poor little brain isn't like it use to be
     
  15. DanClarke

    DanClarke Well-Known Member Full Member

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    I too was told to look for 5V supply to the sensors but the Voltage on both front ABS Sensors on my 2000MY 4.6 is 3.3V (Wabco-D System) and it is working fine.
     
  16. wammers

    wammers No longer with us, RIP Donater

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    Nominal voltage to sensors is five volts. Main things to check are supple voltage presence, resisted continuity through sensor, and sensor to reluctor ring gapping. If feed voltage is present, there is a resistence circuit through sensor and sensor is gapped correctly a signal should be sent to ECU when wheel rotates.
     
  17. DanClarke

    DanClarke Well-Known Member Full Member

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    Completely agree Tony, I was expecting 5V (a common "logic systems Voltage"), so I was surprised to see this commonality of exactly 3.3V at each sensor connector and I wondered if the 3.3V came with the Wabco-D ECU, and the earlier Wabco system had been 5V. I am not disputing things at all. I trust you are well? :)
     
  18. wammers

    wammers No longer with us, RIP Donater

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    Not good but not dead yet. Never delt with D so if that's what is fair enough. As far as I recall from memory resistance through sensor is around 9 ohms. Pretty simple thing to diagnose.
     
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  19. DanClarke

    DanClarke Well-Known Member Full Member

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    I had suspected you were still in the land of the living (because of the continued assistance offered to others) ;)
    Sorry to hear that you are "not good", I hope things improve soonest!
     
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  20. Rubberknees

    Rubberknees Well-Known Member Full Member

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    keep going wammers we will always need you
     
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