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  1. ABS Sensor: ABSolute pain! 
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    Hi,

    1) Scenario

    Car was left parked up/undriven (during several days of very wet weather), and after driving it I noticed that the ABS and ASR (traction control) lights were lit on the dashboard. This didn't seem to affect normal driving and braking, but I did take note and drove cautiously nonetheless.

    Managed to scan for fault codes later on, and from the ABS Controller (Address 03) retreived;
    00283 - Front Left ABS Wheel Speed Sensor (G47)
    012 - Electrical Fault in Circuit

    This suggested a fault with either the wiring/connections to the Front Left ABS Sensor, or to the Sensor itself. I ordered a replacement Front Left sensor [1J0.927.803].

    2) Attempted Fix

    Today, I optimistically tried to determine the fault. Haynes details the steps in Chapter 9.20. Below is my interpretation of this procedure

    1) Remove wheel nut covers
    2) Lightly loosen wheel bolts
    3) Jack up front left of car and also position on axle stand
    4) Chcck rear wheels
    5) Remove wheel bolts
    6) Remove wheel
    7) Try and remove connector to ABS Sensor
    8) Wow, isn't this sensible. The clip to remove the ABS sensor is obstructed by the shock absorber, so I can't easily remove the ABS connector.

    Perform (7 to 8) until you loose patience and pull the connector to the ABS sensor out violently

    9) Unscrew bolt that retains ABS sensor to hub (5mm hex head).

    10) Remove ABS Sensor from car
    11) Remove very tightly jammed/rusted ABS Sensor from car
    12) Loosen ABS Sensor with copious amounts of WD40
    13) Try and tap out or lever ABS Sensor

    Perform (11 to 13) until you realise this isn't going to happen
    The old ABS Sensor is corroded into place, and simply won't come out.

    At this point, I tried to ensure that the ABS Sensor really did need to be removed, and plugged in the replacement sensor, then scanned for fault codes.
    After clearing the pre-existing 00283.12 fault code, a rescan proved that the new ABS Sensor was actually working properly, and the old one did indeed need replacement.

    The old ABS Sensor, had what looked like iron fillings /rust attached to it's magnetic sensor head (would this cause ABS sensor failiure, and can this just be cleaned up ?)


    3) Questions and What Next ?

    a) What caused the ABS Sensor to fail ? Was it the rain ?
    b) What effect does the rust have on the ABS Sensor, would cleaning this up fix the sensor and how best to clean this ?

    c) In as much detail as possible please, how should the ABS Sensor be removed ?

    The ABS Sensor is like a corrupt politician: Once it's in for too long, it's a real b*****d to remove.
    • It's plastic so how much pulling,pushing or abuse will it take before breaking ?
    • I've tried pulling it that doesn't seem to work
    • It appears to be stuck in the front hub housing. Should it be pushed out from the front. (the disk brake would need to be removed, but the ABS rotor would still be in the way) ?


    d) How safe is the car to drive with a faulty ABS Sensor ? (I expect that neither ABS nor ASR traction control will work)

    e) Will the car fail its MOT with ABS not working ?

    Would really appreciate your experience in this, particularly regarding removing the old ABS Sensor.
    It seems easy enough, but because it's made of plastic, and covered by the disc and the ABS rotor it's much more difficult to remove that I would have imagined.

    Thanks,
    TR7
    Last edited by tornadored7; 20-03-2008 at 12:29 AM.
     
    2 0 0
     

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