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Old 08-25-2003, 12:11 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Disconnect the O2 sensor. The duty cycle should read 50%. Key on, engine off, should give 70%.

Use those figures to calibrate your test technique. if you don't get those numbers you are either testing wrong or you have electronic control problems.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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