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Old 02-13-2005, 11:01 AM
Duke2.6 Duke2.6 is offline
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Join Date: Mar 2003
Location: Southern California
Posts: 2,276
Quote:
Originally Posted by A264172
did 3 tests
1) at X11 (ignition on engine off)
pin 3 red banana to V/F/C/Ώ/mA/uA
pin 2 black banana to COM
Dial set to % duty
reading 30.1

2) at X11 (engine running)
pin 3 red banana to V/F/C/Ώ/mA/uA
pin 2 black banana to COM
Dial set to % duty
reading 50.6

3) in passenger footwell
black wire lead from OČ Sensor to red banana to V/F/C/Ώ/mA/uA
aligator clip to front right fender inside engine compartment to black banana to COM
Dial set to % duty
reading 0-0.0016

Am I doing this wrong?
Connect the VOM to the O2 sensor output - pull the connector apart just enough to get the probe in without disconnecting O2 sensor from the circuit. A VOM should measure about 450 mV. If you can test the O2 sensor with a scope, it will show the wave form and the output should jump back and forth between about about 0.2 and 0.8 volts a couple of times per second. This is the best test for O2 sensor health. Also test the O2 sensor heater, which is the two wire connector. Check for system voltage on the harness end, and continuity on the 02 sensor pigtail.

Your high CO readings indicate a rich mixture, so the Lamda system is probabably not functioning properly. A common culprit is a faulty O2 sensor. The Lamda engine temperature sensor could also be fauly - sending a false low temperature signal, so the system always thinks the engine is cold, or it could be the EHA or control unit problems.

Duke
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