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Old 07-13-2017, 05:13 PM   #1
Yober
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Join Date: Mar 2006
Location: BC Canada
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My Ride: 2000 BMW 323i, 2000
DSC mulfunction

I have 2000 BMW 323i and recently I have replaced the inner/outer tie rods.
After the replacement I took the car to the mechanic shop for the wheel alignment.
20 minutes after I drove away from the mechanic shop, all of the sadden 3 indicator lights came on my dashboard: 1) DSC; 2) ABS; 3) Brake.
I phoned back to the mechanic and explained the situation. I asked him if this is something related to the wheel alignment activity. He responded that unlikely but invited me back to check the next day.
The next day the indicator lights disappeared. Then a day after they came back On, but this time just DSC and ABS.
I drove to mechanic shop, he looked if there are any sensors that could of gotten damaged. It seems that all 4 ABS wheel sensors were intact. He suggested leaving the car for a day with him, so he would connect his tester and drive around to see what is happening (I havenít done that yet, canít find a time when I donít need a car for a day).
As soon as drove away the lights disappeared.
Then a day after all 3 indicator lights came back On.
I ran my own Autel MaxiDiag Elite MD802 tester and found the following fault code:
31 ; DSC: Wheel-speed sensor, rear left
I deleted the code in order to see if this might be a glitch, but a day later all 3 lights again came back.
I ran another test and this time I found 2 fault codes:
A8 ; DSC: Voltage supply, sensor
31 ; DSC: Wheel-speed sensor, rear left
Since then all 3 indicator lights were spontaneously coming On and Off.
On top of this there are instances when just the DSC indicator comes On for few seconds and at that moments the radio turns Off. As soon as DSC indicator disappears the radio turns back On.
Has anyone here experienced the same situation? What can be done?
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Old 07-14-2017, 12:46 AM   #2
armenh7
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How's your battery? What's the voltage? A bad battery can cause many issues.
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Old 07-14-2017, 12:55 PM   #3
Yober
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Quote:
Originally Posted by armenh7 View Post
How's your battery? What's the voltage? A bad battery can cause many issues.
Armen jan
Did not have any issues with the battery, replaced it last December (although it is refurbished kind).
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Old 07-14-2017, 02:20 PM   #4
Silverdogz
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Your wheel speed sensors are bad, have them cleaned or replaced.
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Old 07-14-2017, 02:33 PM   #5
armenh7
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Quote:
Originally Posted by Yober View Post
Armen jan
Did not have any issues with the battery, replaced it last December (although it is refurbished kind).
One of the errors were with voltage, that's why I asked.
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Old 07-14-2017, 02:33 PM   #6
jfoj
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The ONLY cleaning a wheel speed sensor might need is to blow off any metal filings that are stuck to the sensor from metal on metal brake pad contact or other metal filings.

If you have a Prosumer/Professional level scan tool that can read ABS codes, it should be able to also read and display Live/Realtime data. You should be able to drive around and watch the wheel speed sensor activity and speed readout. Keep in mind unless you are driving DEAD straight and this is even hard to do, the wheel speed sensors will all vary slightly while turning or not driving in a DEAD straight line.

Usually a bad wheel speed sensor will register 0 MPH then jump up to speed around 5-10 MPH while the good sensors will count from the moment the car moves.

The other possible problem is the sensor will STOP reading or increments at a specific speed. For example it may stop at 24 MPH or start to read low when a specific speed is reached while the working sensors count and display properly.'

With 4 wheel speed sensors, it is easy to spot 1 or 2 bad sensors if you can view Live/Realtime wheel speed data.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 07-14-2017, 05:15 PM   #7
Silverdogz
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Live Data is a good idea, I show how to set up INPA here and it should talk to your MK60 just fine.

http://forum.e46fanatics.com/showthread.php?t=1135129
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Old 07-14-2017, 05:52 PM   #8
jfoj
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The OP has an Autel MaxiDiag Elite MD802 which is a stand alone OBDII scan tool that also has support for ABS and Airbag/SRS. So it "should" be able to read and display the Wheel Speed sensors as well as graph them.

No need for anything more a this point if his tool can monitor the Wheel Speed sensors.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 07-17-2017, 10:53 AM   #9
jdstrickland
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Check the brake fluid. It is the low-order item that feeds the ABS and DSC lights. If the brake fluid is low, then the ABS will be affected. If the ABS is affected, then the DSC is also affected.

ABS looks for one or more tires to lock (skid) and the brake pressure is removed from those corners of the car. If the fluid is low then the ABS can be unreliable and the light comes on.

DSC is looking for the rear tires to be spinning faster than the front tires, if this happens then throttle is reduced and brake pressure can be applied. If the brake fluid is low then DSC can become unreliable, so the light comes on.

Low Brake fluid causes the BRAKE light to be on, and this can feed into the unreliability of the ABS and DSC, making those systems turn their lights on as well.
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