P38A Front Wheel ABS Speed sensors

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tomcat59alan said:
Kept man then? Don't know where the time has gone,just watched the news and it was a year since they brought the evacuees from China to the local hospital for isolation. :eek:
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I know al I sold my tyre buisness & was working as road crew for all the well known celebrity artists that obviously all went wrong in March last year now I’m a Vehicle technician/Dvsa mot tester strange world
 
Grrrrrr said:
I cannot remember. I seem to have trouble remembering the simplest things these days. @Henry_b probably knows.
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Anything from 0.5 to 2000Kohms others go higher which is what my cheapo meter reads ;)

Easiest test OP can do is to measure the resistance of the sensors. The faulty one is the one that reads differently to the others and will probably be open circuit. They are only a coil so a break means they don't work. ;)
 
Hi,I’ll do that. need to ease the old lady through her MOT so doing the front brakes.
Have ordered a couple of new bushes and will check the fuses and relay.


Are the connectors from the sensors easy to locate on the underside or in engine bay ?

thanks again !

Bob
 
awkwardbob said:
Hi,I’ll do that. need to ease the old lady through her MOT so doing the front brakes.
Have ordered a couple of new bushes and will check the fuses and relay.


Are the connectors from the sensors easy to locate on the underside or in engine bay ?

thanks again !

Bob
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Just follow the wires back,from memory the plugs are in the engine bay ,inner wing.
 
DanClarke said:
I too was told to look for 5V supply to the sensors but the Voltage on both front ABS Sensors on my 2000MY 4.6 is 3.3V (Wabco-D System) and it is working fine.
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Nominal voltage to sensors is five volts. Main things to check are supple voltage presence, resisted continuity through sensor, and sensor to reluctor ring gapping. If feed voltage is present, there is a resistence circuit through sensor and sensor is gapped correctly a signal should be sent to ECU when wheel rotates.
 
wammers said:
Nominal voltage to sensors is five volts. Main things to check are supple voltage presence, resisted continuity through sensor, and sensor to reluctor ring gapping. If feed voltage is present, there is a resistence circuit through sensor and sensor is gapped correctly a signal should be sent to ECU when wheel rotates.
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Completely agree Tony, I was expecting 5V (a common "logic systems Voltage"), so I was surprised to see this commonality of exactly 3.3V at each sensor connector and I wondered if the 3.3V came with the Wabco-D ECU, and the earlier Wabco system had been 5V. I am not disputing things at all. I trust you are well? :)
 
DanClarke said:
Completely agree Tony, I was expecting 5V (a common "logic systems Voltage"), so I was surprised to see this commonality of exactly 3.3V at each sensor connector and I wondered if the 3.3V came with the Wabco-D ECU, and the earlier Wabco system had been 5V. I am not disputing things at all. I trust you are well? :)
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Not good but not dead yet. Never delt with D so if that's what is fair enough. As far as I recall from memory resistance through sensor is around 9 ohms. Pretty simple thing to diagnose.
 
wammers said:
Not good but not dead yet. Never delt with D so if that's what is fair enough. As far as I recall from memory resistance through sensor is around 9 ohms. Pretty simple thing to diagnose.
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I had suspected you were still in the land of the living (because of the continued assistance offered to others) ;)
Sorry to hear that you are "not good", I hope things improve soonest!
 
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