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90 300se Cel
Hi,
My check engine light has come on for about 6 months, but there was no code from the push button/LED on the firewall. I held down the button for few sec and the LED lit, but no flash after the button was released. I know the LED worked before (a few year back)... it flashed 16 for EGR, which was then fixed. I could reset the CEL by unhooking the battery, and it would come back in a few days. The car seems running fine. It is now time to take the car to smog check, and I try not to have to take the chance of having the light come on during the test. I went through the related pages in Alldatadiy, but I could not tell if there was another place to hook up a pulse monitor. I appreciate any help or suggestions. Thanks Kachun
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Kachun 1990 300SE 2003 E320 |
#2
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90 300se
about the only thing that the cel was for back in 90 was to warn of problem with o2 sensor.if the ecu did not see a changing voltage over a period of 10secs it would bring on the light.this could be one of 4 things.[1] system has vacuum leak and so very low voltage[2]system is running too rich[.900 volts][3]o2 sensor disconnected.[4] o2 sensor defective.hope this helps.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
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Thanks for the info. I take that you meant the O2 sensor was the one event that you thought could light up the CEL without throwing a code.
I did checked the 02 sensor with a scope on the X11 connector. The on/off ratio was in range at both idle and high RPMs, so the chance was high with intermit cable/connectors. I will recheck all the connections. Well, it is way passed 60K miles with my current O2 sensor, maybe, I go ahead and replace it. Thanks again
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Kachun 1990 300SE 2003 E320 |
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