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check engine-2-1-2 OBD code 200 1990

posted by  jdl on  Mon Oct 11 11:37 CST 2004
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last visit: Mon Feb 6 11:55 CST 2012
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Thank you everyone for the tips. I just did the voltage check at the o2 sensor and got rapid movement between 2.5 and 6.5 volts. Then I followed the test proceedure suggested by Bruce Young. I got slow movement between .5 and .6 volts closed loop. Then I unplugged the ecu wire and and did a full rich test. the o2 signal was a steady 1.1 and I applied the 1.5v battery to the green ecu wire and absolutly nothing happened. I then did the full lean test, grounding the green wire and again absolutly nothing happened and the o2 volts remained at 1.1 I put everything back together and tested the voltage again at the o2 sensor and got a fluctuating reading of .5 to .6volts.

I'm confused about getting what seemed like normal readings at first and than not being able to duplicate those readings. Any suggestions?





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New check engine-2-1-2 OBD code [200][1990]
posted by  jdl  on Sat Oct 9 09:48 CST 2004 >


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