Cadillac Repair: Trouble Codes, twilight sentinel, cadillac seville

Question
My 1986 Cadillac Seville 4.1 has been a problem to me. I have been replacing control modules,dist.cap,coil,spark plugs and plug wires,and rotor and still having problems.I need to know what these codes mean,EO31,EO53,B120,B121,B122,B448,ECM?

Answer
E031   Shorted MAP sensor.

E053   distributor signal interrupt.

B120   Twilight Sentinel delay pot circuit problem.

B121   Twilight sentinel enable circuit problem.

B122   Panel Lamp dimming pot circuit problem.

B448   Very low A/c pressure condition.


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