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For fault type 6 where the ABS system sporadically fails and stops functioning during braking and remains lit until the ignition is switched off, the problem areas are listed as:
a) Intermittent sensor related fault
-fault in wiring between control unit and sensor: open circuit, short circuit (weak signal) in sensor wiring
-faulty sensor
b) Intermittent pump related fault
-faulty pump motor relay
-fault in wiring between control unit and hydraulic pump
c) Intermittent valve related fault
-fault in wiring between control unit, valves and valve relay
-faulty valve relay
-faulty valve coil
I would concentrate on a sensor related fault, specifically damaged sensor wiring or a damaged sensor, especially for the front sensors as they are the most exposed. In my recollection that is by far the most common problem area reported here with ABS systems. Refer to my earlier notes for likely fault areas related to sensors and wiring. Although the other problem areas are certainly possible, I don't recall ever seeing those reported here on the brickboard. If you haven't already done so then do some heavy duty searching of the brickboard for all articles related to common ABS faults.
--
Dave -own 940's, prev 740/240/140/120's & quasi-expert only on a good day
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