Volvo RWD 200 Forum

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Code 221 and 231 200

posted by  r53hill on  Wed Feb 13 10:13 CST 2002
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Resetting the adaptive trim part was where I stumbled.
After replacing the ECT in my 1991 240 Wagon I received code 221 and 231 with a very rough and surging idle. My oxygen sensor did not pass the voltage test so I replaced it. The poor idle continued. I searched high and low for a vacumm leak and found a crack in the air intake hose. After replacing the hose the poor idle continued. I cleaned and greased the AMM connection and the poor idle continued. My next move was to replace the fuel injector seals and then I thought about what you had said, "you'll need to reset the adaptive trim". I disconnected the battery and now the old 240 is idling like the old Singer Sewing Machine.

I figured I had just missed those instructions in the Haynes manual but a look there and the FAQ produced no instructions for resetting the adaptive trim. Am I the only one that missed this trick??

Ron Hill
1991, 240DL Wagon
Macon, GA






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New Code 221 and 231 [200]
posted by  r53hill  on Wed Jan 30 12:40 CST 2002 >


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