Looking for Cadillac Error Codes

[Lloyd Ferguson]

A couple of weeks ago the "Check Engine" light in my father-in-law's 1990
Cadillac Fleetwood 4.5 litre has come on.  Accessing the error codes on its
built-in system displayed:

        E49     E98     EE      70

I cleared the codes and the light did not come on again for 2 weeks, this
time the codes are:

        E31     E34     E49     EE      E49     70

None of the books I can find explain what these codes mean (I guess the
Caddy is different from other GMs).

Can anyone translate these for me?

Lloyd Ferguson
ferguson at isb.ca