At 07:34 AM 3/4/2002, WVVW wrote: >1)leave the O2 sensor connected and take the reading from the O2 lead to >ground? This will show you whether the ECU is running in closed-loop mode or not. Steady reading ~ half a volt indicates not sensor not hot enough to work yet; random-looking readings above and below half a volt indicate proper closed-loop operation. An oscilloscope would show a sort of crappy square wave as the ECU drives the mix back and forth across the stoichiometric point.
>2) Disconnect the O2 sensor and take the readings from the disconnected leads? This will put the ECU in open-loop mode and show you whether the mix is rich or lean under the given conditions. Voltage near 1 volt is rich; near 0 is lean. It's extremely sensitive though, can't tell how rich or how lean beyond a uselessly tiny range. The ECU in closed-loop doesn't even try; it just hunts back and forth across the line. You have to use a meter with at least 10 megohms input impedance to keep from loading down the line and getting false-low readings. >3) When doing the CO2 adjustment, should the idle stabilizer be connected >or bypassed? CO? I'm too lazy to look it up in Bentley, but bypassed is probably specified and is certainly OK. david -- David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation" |
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