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Old 04-23-2003, 03:02 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Your reading should be obviuosly cyclical. If you are just wandering around in that area it isn't working. Did you get 70% key on engine off? Do you get 50% with O2 sensor disconnected , engine at idle? Does the duty cycle slowly go toward 0% if one puts the O2 sensor input to ground? Does the duty cycle go toward 100% if one grabs 12v with one hand and the O2 sensor input with the other?

Do this intergrater range test with O2 sensor disconnected and the battery through body and ground circuits hooked to the wire that goes to controller (not the sensor - hook where sensor hooked).
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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