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Thread: Hmmm ABS

  1. #1
    Join Date
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    Hmmm ABS

    The ABS system has been a issue for awhile. The ABS light at first took a while to go out. Now it stays on. I have done a bit of Googling which indicated that the wheel sensors may be the culprit and may need re setting. So I removed each of them, cleaned and refitted them. Reset or cleared the system by a method found on a site. Disconnect the earth then turn the head lights on. This removes all power. First test drive the light went of as it should then cam back on again and stays on. I also on the odd occasion get a hard pedal when braking. This I gather is the ABS working way to early. Braking is still good. The hard pedal will be issue though. What would be next to look at ?
    Cheers Hall

  2. #2
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    Disclaimer: Brakes/hard pedal etc are above my pay grade, but I can share an ABS light experience.

    There is a procedure where you bridge a couple of the pins on the diagnostics plug under the steering wheel and then the light will blink a pattern that tells you the specific fault code. If there is a sensor fault it can even tell you which one it is.
    A search for 'discovery 1 abs blink codes' should find you the instructions.

    For me it turned out to be a faulty sensor, sometimes the wire breaks internally just where it enters the sensor. Got a new one from Roverlord and all good.

    Cheers,
    Andy

  3. #3
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    By no means an expert on ABS and the codes, but did download some instructions a while ago, method as said, uses a paperclip and either reading or removing the fault codes,

    I would advise searching your self as I did not get around to trying this out, the engine blew before I got to it.
    This was taken from another land rover forum.

    As copied;

    I cannot take credit for the blink procedure, it was in a pdf on here .

    Troubleshooting Why Your ABS Light is On - Range Rover Classic and Discovery 1
    If your ABS Light is illuminated and you are not near a dealer or other diagnostic equipment, you
    can use the blink method to determine what is causing the fault. First locate and remove the ABS
    Warning Light Relay from the group of relays underneath the seat (consult owner's guide for
    specific vehicle location, if needed). Then, find the blue 4 pin connector under the front of the
    driver's seat on the RR (or under the black, cardboard lower dash drivers side on the Disco-1) and jumper the
    black to black/pink wire with the key on – a paperclip will work.
    ATTN: Only pre OBDII Disco's had the blue 4-pin connector. The base is blue and I am pretty sure it is X104 in Rave.

    All OBDII Disco I's you have to jump terminals 5 and 15 on the data link connector. The data link connector is where you would plug in
    your scanner to read engine codes. You do not have to pull the relay.

    OBD2 pin out:
    \ 1. 2. . 3. 4 . 5. 6. . 7 . 8. /
    . \9 10 11 12 13 14 15 16 /

    Remember that 16 is +12V at all times. Be careful that you only stick it in 5 and 15!!

    (forget all of the periods, just trying to space it out)


    Jumper together terminals 5 and 15 with a paper clip and with the ignition in the on position II,
    read the blink codes.
    If you remove the paper clip while reading the code, it will erase that code. So that's what I did,
    read and erase each code, one at a time. Took for a test drive, light went out, all is well. The light will stay on until you drive it.


    The ABS light will first flash a long then short blink to indicate the system is in diagnostic mode.
    Then you will start to get a flash sequence. Don’t panic cause the code will repeat. There will be a
    set of flashes then a pause then another set of flashes then a long pause then it will repeat that
    code 2 more times. You are counting two sets of flashes (i.e. blink, blink, pause, blink, blink, blink,
    blink, blink, blink would be code 2-6 or “Stop Light Switch Fault…see codes below.)

    To clear the code…you need to remove the jumper during the flash sequence.
    Note: You may have more than one code to clear so don’t panic if you clear the code and another
    sequence begins. It will continue to flash the code(s) until it has been displayed then the ABS
    light will stay on. Turn the key off then back on & reinsert the jumper to go to the next code. If you
    are not sure of a code just leave the jumper in & cycle the key on & off to restart the sequence.
    Write down each code as you go & erase each one by pulling the jumper during the blink
    sequence to erase that code. When you pull the jumper, allow the sequence to finish. The ABS
    light will stay on after the code has finished blinking. Let me know if you need any more help or if
    you need to know what the codes mean.

    The ABS code series always starts with the following sequence of 1 long, 1 short, pause 1 long,
    and 1 short. It then goes into displaying the codes. Every code starts with 2 pulses on (2.5s each)
    and then a series of pulses which are the rest of the code.
    Codes:
    2-12 Front Right
    2-13 Rear Left
    2-14 Front left
    2-15 Rear Right
    Reason: Too large an air gap, or sensor has been forced out by exciter ring – try tapping sensor
    back into place.
    5-12 front right
    5-13 rear left
    5-14 front left
    5-15 Rear Right
    Reason: Sensor wire has an intermittent fault – check connection(s).
    6-12 front right
    6-13 rear left
    6-14 front left
    6-15 rear right
    Reason: no output from sensor. Sensor may have too large an air gap. Try tapping in sensor(s),
    check connections.
    4-12 Front right
    4- 13 rear left
    4- 14 front left
    4- 15 rear right
    Reason: Wiring to sensor is broken or sensor resistance is too high. Inspect wiring at sensors.
    2-6 Stop light switch
    Reason: Faulty switch or wiring. Replace brake light switch.
    Code 2-7: Continous supply to the ECU with the ignition off. Faulty valve relay or wiring.
    Code 2-8: No voltage to ABS Solenoid valves. Faulty valve relay or wiring.
    Codes 3-0 to 3-9: Open circuit or connection from ECU to solenoid valve in booster, or in ECU.
    Codes 4-0 to 4-9: Short circuit to earth from ECU to solenoid valve in booster.
    Codes 5-0 to 5-9: Short circuit to 12 volts in connection from ECU to solenoid
    valve in booster. Possible earth fault.
    Codes 6-0 to 6-9: Short circuit between two connections from ECU to solenoid valve in booster.

    hope this helps.

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