I have pulled the fault codes and they are as follows.

Car: Ford, Mustang GT, 1989, 5.0 - Back to Fix-It - Ford Repair Manuals

Q.I have an 89 ford mustang gt with issues. I have pulled the fault codes and they are as follows.
15 51 22 53 54 67. These are the ON DEMAND codes, key on engine off.
The code reader says I have to fix these codes before moving on. Code 15 is a failure in the electronic control assembly. Does this mean my ECA is toast? Car was running great then things went down hill so i pulled the codes. How do I deal with the code 15, is it fixable. There is a lot more to this car but for now I just want to know how to procede.
The check engine light has never come on before and the computer is the stock EEC-IV OBD1 A9S.

I already checked/done: Pulled error codes in KOEO mode

Answer Code 15 is for Keep Alive Memory Test failure, usually it occurs after the battery or computer has been disconnected, because the continuous power to the EEC was interrupted. After clearing codes and retesting, this code should go away. If it does not, check for "hot at all times" power at pin 1 of the EEC connector, there should be 12v there key on or off. Check for good ground on pins 40 and 60. You can use a test light to verify good power and ground here, with the connector disconnected. A good terminal to pin fit is also essential for a good connection. It is possible that an internal computer fault could exist, first.. >> login for more

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I have pulled the fault codes and they are as follows.