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P38A P1592 rough road signal implausible

Discussion in 'Range Rover' started by kermit_rr, May 10, 2021.

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  1. pwood999

    pwood999 Well-Known Member Full Member

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    Given the price, it might be worth an email to Wabco ?

    Also open it up & look for bad joints or water ingress, after all it is located below the heater inlet air vents that are known leak points.
     
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  2. kermit_rr

    kermit_rr Green Member Full Member

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    Already opened it up it looks like new :/
    No harm in emailing i guess!!
     
  3. Grrrrrr

    Grrrrrr Technician, Bodgit & Scarper Ltd Full Member

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    I doubt there's anyone left who understands it but you can try.

    I wish @martyuk was around. He's found various faults with the WABCO ECUs over the years but also with what the Nanocom reports on it.
     
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  4. kermit_rr

    kermit_rr Green Member Full Member

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    Digging through the docs again, the rough road volts is supposed to be continually changing under normal operation, so that's ruled out as a problem!!
     
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  5. kermit_rr

    kermit_rr Green Member Full Member

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    I'm starting to think there is no problem as such.
    I think I have a bad sensor/connection, given the wheel bearings appear to be OK
    I think the fact nanocom reports 'rough road status' as active, is untrue/programmatic mistake
     
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  6. tomcat59alan

    tomcat59alan Well-Known Member

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    Have you asked BBS?there may be something on the forum.
     
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  7. kermit_rr

    kermit_rr Green Member Full Member

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    something to note...
    Good plan, I've not!!
     
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  8. tomcat59alan

    tomcat59alan Well-Known Member

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    I guess you realized I meant the BBS forum.;):D:D
     
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  9. pwood999

    pwood999 Well-Known Member Full Member

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  10. kermit_rr

    kermit_rr Green Member Full Member

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    ordered a used wabco D, alleged tested working OK no faults
    not receiving signal from one of the wheels and as a result giving the 'short to another sensor' error
    FFS didn't need this argument
     
  11. 300bhp/ton

    300bhp/ton Well-Known Member

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    Did you get any further with this?
     
  12. 300bhp/ton

    300bhp/ton Well-Known Member

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    Hi, which ball joints are you referring too? And how would they impact the sensors?

    Also, how can you check/gap the sensors? Thanks.
     
  13. kermit_rr

    kermit_rr Green Member Full Member

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    Not really, not doing anything now until i get this replacement modulator fitted.
    I've got a new sensor to put in the hub, but I'm not convinced that will resolve the problem, though i suppose it could simply be dirty, as it only produces an error <1mph with foot on the brake
     
  14. kermit_rr

    kermit_rr Green Member Full Member

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    I'm guessing the front hub ball joint.
     
  15. tomcat59alan

    tomcat59alan Well-Known Member

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    What's the condition of the reluctor ring like? The X type had a problem due to to the ring being so rusty and closing the gaps between the teeth.;)
     
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  16. kermit_rr

    kermit_rr Green Member Full Member

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    No clue how you get to see it :eek: without taking the sensor out, which i can't do without destroying it, which i don't want to do
     
  17. tomcat59alan

    tomcat59alan Well-Known Member

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    Don't think you can mate.:( it has a cover over it. That's why I cut the cover to allow the sensor to stay in place when removing the swivel housing.
     
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  18. kermit_rr

    kermit_rr Green Member Full Member

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    wheres the cover? something i can do 'on vehicle'?
     
  19. Datatek

    Datatek Well-Known Member

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    the ABS sensors are NOT Hall Effect, they are a simple wire coil wound round a soft iron core, I can post a photo if you want evidence.
     
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  20. kermit_rr

    kermit_rr Green Member Full Member

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    What's the correct way to test/read output with a dvm?
     
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