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Code 221, 231, 121 200 1993

posted by  Steve on  Thu Jan 17 14:30 CST 2002
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last visit: Fri Oct 24 07:16 CST 2014
[RELATED]

121 is a bad AMM signal, the others are fuel trim (mixture) related. Tough to say, but start with the basics:
-make sure the AMM and other engine connectors are clean and deoxidized and protected with dielectric grease
-clean the throttle body and make sure plugs, etc. are OK
-check the fuel pressure regulator: it may be bad
-clear the codes and try again, pulling the codes once more so you don't have multiple codes for multiple problems

If the above are OK, then your problem is probably with the AMM or the idle control solenoid.
BTW, did someone pull the AMM connector while the ignition was on? This will fry the AMM.






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