![]() ![]() The ABS pump operation is part of the self-test.Ģ. Regarding ABS pump operation we have 3 scenariosġ. There is a very interesting line in Possible Causes “Modifications/Retrofits”Ĭould we confirm wheel and tyre are the specified diameter, tyre configuration/circumference are the same and check for any recent wheel bearing replacementsĪll the above assumes “Implausible Signal” refers to wheel speed. Using Speed Sensor current would be ideal rather than voltage but of course this requires 4 clamps (or 1 clamp and 4 road tests) We could then plot the frequencies of these signals as they should be perfectly matched when driving in a straight line. We need to capture the operation/ output of all sensors from 0 km/h up to and just after the generation of the fault code (approx. If so, I would use 4 x Scope channels to capture 4 x wheel speed signals over a slow time frame as in the Case Study link above. I assume from the description “ABS Operation: Implausible Signal” this is referring to Speed Signals? The inrush current into the ABS pump will most certainly (momentarily) pull down on the sensor supply voltage and result in some volt drop on the earth return (seen on channel C)įrom what I can see, at this stage I would focus on the description of Fault Code 01130 along with the detection condition 15 km/h and this fits with the above self-test mentioned above. You mentioned in your post that this effect can be seen in all four sensors at approx. ![]() I have seen this event numerous times when measuring ABS sensor voltage and here is one such example If you measure the ABS sensor current flow instead of the voltage, the signal is near immune to the operation of the ABS systemĪt 15 km/h ( approx.) the ABS system is carrying out a pump/actuation test which maybe felt or heard by the customer if the road surface is smooth & the cabin is quiet Looking at your capture, this would appear to be interruption of the ABS speed signal when measured using voltage. ![]()
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