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Testing wheel speed sensor...how to ?

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Old 08-30-2009, 11:58 AM
mikren mikren is offline
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Testing wheel speed sensor...how to ?

I have a digital volt meter which also reads ohms but I have no idea how to test the speed sensor. How to, where to connect and stuff. I need some guidance on this one. 99 F150 4x4 Thanks.
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Old 08-30-2009, 02:31 PM
mikren mikren is offline
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Ok, I figured out how to test them.

The 2 front sensors are giving me 400 ohms each and it goes up a little as I spin the wheel.

The rear sensor reads about 1800 ohms and also goes up when I spin the wheel.

Is that about right ? Does this mean the sensors are good ?
99 F150
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Old 08-30-2009, 05:04 PM
mikren mikren is offline
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ok, now I'm a little confused.... Is the sensor that is mounted on the hub assembly the abs sensor or the speed sensor ? or is it both ?
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Old 08-30-2009, 07:10 PM
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the pickup in the hub is the ABS. Some call it a "speed" because it measures the revolutions and compares to the other front wheel, and rear axle to compare and see if one is locking up, or slipping.
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Old 08-30-2009, 07:18 PM
mikren mikren is offline
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ah, thanks for clearing that up .what about those readings I got from them....is that about right and does that mean they're fuctioning properly ?
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Old 08-30-2009, 10:23 PM
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i dont really know the resistance. wonder why the back one reads 4 x as much? could be bad, or maybe becasue the gear is 4 x larger? is this why you took it apart?
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Old 08-31-2009, 01:09 PM
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You may need to use your low AC scale because they are magnetic field change sensing and produce a voltage output the module uses when the wheel is rotating.
Resistance is for general static measure to check for shorts and opens in the sensor and it's connecting cable.
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