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Thread: ABS Troubleshooting

  1. #11
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    In reply to jcassity

    Sounds like you are off to a good start. I recall a guy on NATO mantioning he had 'all' the Ford tools. I wonder if that included the ABS breakout box. If you could borrow one for a while you might get a little more insight.

    Nice work!

  2. #12
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    ok
    putting this dog to rest although the original poster may be long gone which is unfortunate.

    I completely understand the ABS system at this time.
    Now to link in some documentation.

    To follow up on a couple open items.

    -The break out box transitions a 50 pin connector to an ABS adapter gender changer to 36 pins.
    --the shop manual refers to pin numbers that exceed 36 when troubleshooting and i concluded that within the gender changer some pins are bonded together or not required. Not a logical move in my opinion as referring to a "pin40" on the break out box has no association to the evtm or the shop manual illustration of the ABS module connector. It is however logical as there are only 36 pins on the ABS connector.

    -There are only 25 used conductors at the ABS module but the number sequence follows the correct count as to which position on the connector the wire occupies.

    -**** in my EVTM link below, Page 122 on the RH Rear brake sensor, Ford forgot to label the PK/BK conductor to which pin it goes to. The pin number is ABS module pin #6.

    -It appears that if one were to follow the shop manual without using a breakout box, he/she could simply follow all instructions as though there were a break out box, just as i had suspected. This is only true about 95% of the time for reasons that are too in depth for now, but the good news is that most all troubleshooting steps are easy to follow.

    -Pin 40 or pin 9 are referred to in the manual but at this time i only feel comfortable in saying the referred pin40 is either chassis or internal reference ground. I am not sure what they are doing in a couple steps calling out pin 9 and bonding it to pin 40. perhaps to manually activate the main power relay?, not sure cause it looks like thats an instantanious blown fuse situation.


    so...lets troubleshoot!

  3. #13
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    Ok,
    Another 3 hours and i have updated the physical EVTM drawings with useful information to be used while troubleshooting.
    Please note that the comment on the wheel sensor voltage ***IS*** in AC volts for a reason and is not a typo.

    Just update your records with page 122,123, and 124 as the only changes.

    To the original poster-
    Having your rear wheel lock up makes no sense even using the shop manual.
    The rear ABS (both wheels) are on common Inlet and Outlet hyd solenoids. The fluid path is a single line up until it branches off to each right and left rear wheel.

    I would conclude that there is probably two faults...
    - your rear right wheel sensor is either too close or too far away or simply not installed correctly and the rear left caliper is in a bind.
    you should be experiencing both rear wheels locking up but you are not. I suspect the equipment you installed is done incorrectly or out of wack somehow.

    There are no symptoms in the shop manual that bring in a diagnostic step to cure only one rear wheel locking up. I would say to check and see if the other rear wheel caliper actually works and if not, bleed the line for it must have air.

    like i said, they both should be doing the same thing and if thats the case, a normal probable fault would point to the Inlet rear and outlet rear solenoids.

  4. #14
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    Update again, over some coffee since i slept in.

    I should have started my research using the "1987 Shop Manual Supplement" which basically answers all my previous questions.

    -Pin 40 as refered to in the shop manual is considered as Pin1 chassis ground.
    -Pin 11 as refered to in the shop manual is considered as Ref gnd to the valve body ground.
    -Pin 11 as refered to in the EVTM appears to be bonded to the wrong location on the valve body.
    -All valve body solenoids termination points at ABS controller conflict the EVTM and Shop Manual., however the cirucit ID does match. One could conclude that locating the correct ref gnd will allow a better starting point.

  5. #15
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    Update again,
    please replace your current page 124 of the evtm with the latest revision.

    Revision includes steps to actuate valve body solenoids to determine thier operation is good.

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