Cadillac Repair: error codes, cadillac eldorado, error codes

Question
my 88 Cadillac eldorado is giving me the error codes
E020 current
E030 current
E052 history
B411 current
B552 history

Answer
E020 = OPEN circuit in the fuel pump system.

E030 = IDLE SPEED CONTROL (ISC) motor circuit problem.

E052 = Battery has been disconnected.

B411 = Problem in the cooling fan circuit.

B552 = Battery has been disconnected.


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