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  #1  
Old 11-04-2011, 01:27 AM
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Default ABS speed sensor resistance values?

I measured the abs speed sensors resistance values and they were all 5 ohms or so. All 4 of them are that way.

I was under the impression the resistance reading should be 2K ohms or so?
http://www.jagrepair.com/images/Auto...heet%20XK8.pdf

Does this mean that all 4 sensors are dead? Any thoughts or recommendations?
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Old 11-04-2011, 06:03 AM
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Originally Posted by JagYi View Post
I measured the abs speed sensors resistance values and they were all 5 ohms or so. All 4 of them are that way.

I was under the impression the resistance reading should be 2K ohms or so?
http://www.jagrepair.com/images/Auto...heet%20XK8.pdf

Does this mean that all 4 sensors are dead? Any thoughts or recommendations?
Seems pretty unlikely that all would fail in the same way. 2k ohms, or 1k ohms in later cars, would be expected.

Maybe double-check your measurement procedure. But if they really are all ~ 5 ohms then, yes, it appears they're all bad.
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Old 11-04-2011, 06:21 AM
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you should make sure you are measuring those things right. i think they are working ok
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Old 11-04-2011, 07:25 AM
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you should make sure you are measuring those things right. i think they are working ok
He's right...these tiny little parts are more expensive than they should be. Gaudin (one of our forum sponsors, with consistently good pricing) has them priced at $ 211 each. There are no moving parts to these things...very simple...it's hard to imagine a scenario where they would ALL go away on you.
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Old 11-04-2011, 07:52 AM
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Originally Posted by The Coupe View Post
He's right...these tiny little parts are more expensive than they should be. Gaudin (one of our forum sponsors, with consistently good pricing) has them priced at $ 211 each. There are no moving parts to these things...very simple...it's hard to imagine a scenario where they would ALL go away on you.
Ill bet that you can buy an half decent mechanical stylish watch in the usa for $211 so how can sombody charge the same for a bit of plastic with a few inches of copper wire...IT A RIP OFF
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Old 11-04-2011, 08:37 AM
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Ill bet that you can buy an half decent mechanical stylish watch in the usa for $211 so how can sombody charge the same for a bit of plastic with a few inches of copper wire...IT A RIP OFF
Still waaaay overpriced, but there is a device called a Hall effect sensor inside that bit of plastic.
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Old 11-04-2011, 11:26 AM
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you should make sure you are measuring those things right. i think they are working ok
I ended up taking one of the abs sensor out and measured the two pins right on the sensor. The result is about 4.7 ohms.

I measures the 3 metal strips at the bottom of the sensor.
end to end strip = 70ohms
end to middle strip = 40 ohms

oh well, seems like all dead sensors
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Old 11-04-2011, 02:39 PM
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Still waaaay overpriced, but there is a device called a Hall effect sensor inside that bit of plastic.
hall effect sensors cost pennys to make.the basics of the abs senors are very simple a rotating device ( cogged thingy thats what sam called it) rotating induces a small voltage in the winding in the tip of the abs sensor this is picked up by the hall effect device sent to the cars computer.i would think that they cost 10 max to make ITS A RIP OFF
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Old 11-04-2011, 02:50 PM
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hall effect sensors cost pennys to make.the basics of the abs senors are very simple a rotating device ( cogged thingy thats what sam called it) rotating induces a small voltage in the winding in the tip of the abs sensor this is picked up by the hall effect device sent to the cars computer.i would think that they cost 10 max to make ITS A RIP OFF
I am agreeing with you.
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  #10  
Old 11-04-2011, 09:33 PM
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Hmm, what am I doing wrong?

I measured my perfectly fine 2000 XJR's ABS module harness and got the same 5 ohms for resistance. Yes 5 ohms, NOT 5K ohms.

Pins 3,4
Pins 6,7
Pins 17,18
Pins 21,22

Right? Am I not measuring this correctly somehow?
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Old 11-04-2011, 10:49 PM
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Your meter could be off. Changed the battery lately? When I was troubleshooting a short in one of my sensor wires, mine were all reading 1.13K.
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Old 11-05-2011, 12:30 AM
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Quote:
Originally Posted by JagYi View Post
I measured the abs speed sensors resistance values and they were all 5 ohms or so. All 4 of them are that way.

I was under the impression the resistance reading should be 2K ohms or so?
http://www.jagrepair.com/images/Auto...heet%20XK8.pdf

Does this mean that all 4 sensors are dead? Any thoughts or recommendations?
It is implausible that you got 4 sensors dying at the same time.

So, check the way you are using your meter. Measure a few things with known resistances. If you have to, buy a 1k ohm resistor and measure that to confirm you are operating your meter correctly.

Then, clean out the connectors at the sensor using contact cleaner and let them dry.

Measure and look for 1040 to 1160 ohms directly across the two pins on the sensor with the harness disconnected according to JTIS.
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Old 11-05-2011, 12:30 AM
 
 
 
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1k, abs, bad, good, harness, jaguar, ohm, ohms, reading, resistance, sensor, sensors, speed, testing, xk8



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