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ZKE trouble code 80 and 81, Bad servomotor? ZKE trouble code 80 and 81, Bad servomotor?
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Old 22nd August 2012, 04:46   #1
68FB
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ZKE trouble code 80 and 81, Bad servomotor?
I have the two trouble codes 80 and 81 in the ZKE module shown below. They come back immediately after clearing. Anyone any idea what this servomotor is? I tested all the ZKE/GM3-controlled motors listed in the attached PDF and they all work, except I couldn't test the servotronic valve on the p/s box. I replaced that a year or two ago because of a 74 code, but it could have gone bad again because the steering has been feeling a bit heavy lately. Any ideas?

ZKE trouble code 80 and 81, Bad servomotor?-scan-tool-dtc-capture1.jpg

M5 ZKE III Module Manual.pdf
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Old 22nd August 2012, 15:02   #2
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Servo -valve sorry no idea. If it makes you feel better I have some body codes too that I cant figure out. One is my sunroof switch it works well and appears fine but I get a code for it. There are one or two more that I have and tried to figure out but nothing appears wrong. I will check if it is those codes.
I believe servotronics is the door locks?????
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Old 22nd August 2012, 15:10   #3
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This might be useful:

Hard/heavy steering - possibly GM? - Bimmerforums - The Ultimate BMW Forum
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Old 22nd August 2012, 23:48   #4
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Excellent thread, rao. Thanks. It confirms 81 is for the servotronic solenoid valve on the p/s box. I'll check the wiring first then replace it (again). It does make the car much more pleasant to drive.

I wondered why I was getting a solid code for a short circuit AND a solid code for an open circuit, but I see from WDS it gets two 12V supplies. I guess one is shorted and one is open which makes me think the problem is internal to the valve

Name: Servotronic valve - WDS.JPG Views: 167 Size: 34.9 KB
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Old 23rd August 2012, 00:07   #5
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Glad it helped
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Old 23rd August 2012, 00:40   #6
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I think I see what is going on with your aux fan. I see a 1E auc sensor. Not sure exactly what that puppy does but it certainly is sampling air coming out of the shroud.
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Old 23rd August 2012, 04:45   #7
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That AUC sensor is an obscure one that somehow senses pollution coming into the cabin and puts the HVAC into closed loop, if you have the option. It doesn't look like it has anything to do with the aux fan.

what is the AUC sensor?
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Old 23rd August 2012, 05:46   #8
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Carbon Monoxide sensor who would have figured? Now that I know what it does I will use it.
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AUC sensor location
Purpose of the Sensor F. Auc - Bimmerfest - BMW Forums
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