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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 12-06-2012, 07:16 AM
xfidel xfidel is offline
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Location: France
 
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Mein Auto: 330d
ABS sensor pinouts

Hi,

Could anyone kindly give me the pinout numbers for the four ABS speed sensors on a 2008 year 330D (E91) together with the appropriate diode voltage readings?

Thanks.
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Old 12-06-2012, 10:54 AM
DSXMachina's Avatar
DSXMachina DSXMachina is offline
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Mein Auto: 335i E92 TiAg 6MT ED
Quote:
Originally Posted by xfidel View Post
Hi,

Could anyone kindly give me the pinout numbers for the four ABS speed sensors on a 2008 year 330D (E91) together with the appropriate diode voltage readings?

Thanks.
Best practice is to tap into the ABS sensors thru the ABS sub-menu on the ALDL connector using a scanner. Drive the car and you can see exactly what the waveform looks like which the ABS computer is getting.
Short of that, disconnect the sensor at the wheel where each sensor harness joins the main harness. Plot the graph while spinning the wheel. You will see either no signal, a broken signal, or a degraded signal. All no good.

Unsure what "diode voltage readings" means. I will add this though, voltage alone will tell you nothing at worst, and is inconclusive at best. Most bad sensors meet the voltage spec but crap out in signal duration or presence. How will you detect bad teeth by measuring voltage? That only works if you can parade the waveform and spot a voltage drop in a series of waves.
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Old 12-06-2012, 12:20 PM
xfidel xfidel is offline
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Many thanks DSXMachina but I'm not equipped to look at the ABS outputs with my scanner/software.

I was following advice given in an earlier thread (http://www.bimmerfest.com/forums/sho...1&postcount=48), which pertains to the E39 but my pin numbers aren't the same. In that thread, BlueBee says that one can determine if a speed sensor is bad by reading across each sensor with a digital multimeter in diode mode, which should return a voltage of 1.7-1.8 in one direction and open circuit in the other if the sensor is good.
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