Rick's Free Auto Repair Advice

Test an ABS sensor

If the ABS light is on and you suspect a bad sensor, here’s how you test an ABS sensor

ABS sensors are divided into two categories: active and passive. Passive sensors generate an AC voltage that you can test with a digital multimeter. An active sensor produces a digital square wave and you can only test those with a scope. This article describes how to test an ABS sensor of the passive type.

Disconnect the sensor at the wheel and use a digital multimeter to check the resistance of the sensor. ABS sensorCheck the manufacturer’s specs to see the acceptable range. If you do not have access to that data, then check another wheel sensor and compare the readings. They should be close to one another. Then, change your meter to read AC volts. Spin the wheel and you should see approximately 1 volt. Do the same at another wheel to compare the readings. Before you condemn the sensor, check the reluctor ring for missing or cracked teeth (also known as the tone ring). Also, check the sensor and remove any metal filings, dirt, or grease that may have accumulated on the sensor surface.

For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

You need a professional shop manual to work on a late model vehicle. And you need access to the latest technical service bulletins so you don’t waste time and money replacing parts that may misbehave due to a manufacturer’s software glitch. Forget about those cheap manuals you find at the auto parts store. They will just lead you astray. Here are the two best online shop manuals around.

Eautorepair.net is really Mitchell On Demand with a consumer style interface.
Get a 1-Month subscription (31 Days) for $16.99, 1-Year (Best Value!) for $25.99, or a    4-Year (Best Value!) for $39.99. I like the wiring diagrams in Eautorepair.net better than the hard-to-read factory diagrams on Alldatadiy. However, Eautorepair.net doesn’t show how to remove trim or door panels. Alldata does.

You need a professional shop manual to work on a late model vehicle. And you need access to the latest technical service bulletins so you don’t waste time and money replacing parts that may misbehave due to a manufacturer’s software glitch. Forget about those cheap manuals you find at the auto parts store. They will just lead you astray. Here are the two best online shop manuals around.

Eautorepair.net is really Mitchell On Demand with a consumer style interface.
Get a 1-Month subscription (31 Days) for $16.99, 1-Year (Best Value!) for $25.99, or a    4-Year (Best Value!) for $39.99. I like the wiring diagrams in Eautorepair.net better than the hard-to-read factory diagrams on Alldatadiy. However, Eautorepair.net doesn’t show how to remove trim or door panels. Alldata does.

AlldataDIY.com is simply Alldata with a consumer style interface. They have a different pricing model. But a 1-year subscription for $26.95. Add additional vehicles for $16.95 for a year. Or, buy their 5-year subscription for $44.95. Add additional vehicles for $29.95 for five years.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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