How to test wheel sensors? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 10-07-2017, 09:52 AM Thread Starter
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How to test wheel sensors?

I have a 2007 JK throwing a U1417 code - implausible left wheel distance signal received. I checked the left rear wheel seed sensor with a multimeter and it showed no resistance, so I replaced it. Still shows the code. I checked the left front sensor - showed no resistance and showed no AC volts when I spin the wheel. I replaced that sensor. I noticed that the new sensor had no resistance and also shows no VAC when spinning the tire by hand. HOW do you test these things??

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Tom
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post #2 of 4 Old 10-07-2017, 07:12 PM
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When you say they show no resistance, do you mean your meter reads all zeros? Or does it show infinite resistance, ("OL")?

The new ones on my bench show infinite resistance due to the nature of the circuit inside the sensor tip.

Expecting to see an AC voltage when you spin the wheel is not valid, from what I make of the circuit. There is nothing in the sensor that would generate an AC voltage.

The ABS module sends 12 volts to the sensor. As the teeth on the tone wheel pass the sensor tip, the 12 volts and the amperage are changed. This changed signal is sent back to the ABS module.

It's likely one of your sensors is not getting the 12 volts the ABS module is sending to it.

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post #3 of 4 Old 10-08-2017, 04:47 PM Thread Starter
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Thanks for the reply.
Yes, my meter shows infinite resistance on the new sensors.
I saw a YouTube video showing that if you spin the wheel, the permanent magnets in the wheel are passed near the sensor coil, generating an AC current. I realize not all cars are the same though.

So if I turn on the ignition, I should read 12V coming from the ABS module to the sensor?
Is there anything else to check? I still have ABS lights on, and I can lock up the wheels and skid.

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Tom
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post #4 of 4 Old 10-08-2017, 05:41 PM
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Quote:
Originally Posted by gatorkiter View Post
So if I turn on the ignition, I should read 12V coming from the ABS module to the sensor?
I would think so, but I don't know if 12 volts will always be present with the ignition on, or if only under certain circumstances.

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