I have 30% reading on my '89 560SEL. I know its regarding the coolant temp sensor or wiring. I have replaced sensor, and the resistance values both come to the EZL and ECU, meaning the wiring is ok. But the code still remains.

How do I clear the 30% reading? I have disconnected the ECU, Battery, OVP relay but the I still have the code.

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Regards

Mino Erhan Dallas, TX
'97 SL500 40th A.E.
'97 S320
'01 ML320
'85 Peugeot 505 SW
'07 BMW R1200RT
'74 Suzuki GT750

Unfortunately sometimes there is nothing wron with the system, but the ECU continues to generate codes. I went through this about a year ago with a 90 300SEL. I kept getting several codes. I checked the system thorougly and had to replace the ECU to get rid of some of the codes. I then had to replace the MAS unit to clear the rest of the codes. I'm at home now so I don't have my books. I'll look your system up later today.

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Auto Zentral Ltd.

Thanks for the reply. I guess I should have been more specific with the code.
It is actually a ON/OFF frequency reading, shown as a percentage of duty cycle, typical of K-Jets.
According to the book, this can be done with the tester, but I dont have one.

__________________
Regards

Mino Erhan Dallas, TX
'97 SL500 40th A.E.
'97 S320
'01 ML320
'85 Peugeot 505 SW
'07 BMW R1200RT
'74 Suzuki GT750

Well, this is an OLD question, but...

You cannot "clear" the duty cycle codes. They are not stored because they are a Real Time measurement.

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2012 E350
2006 Callaway SC560

http://pages.prodigy.net/jforgione/MB_Lmbda.html

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe