Cadillac Repair: 1993 cadillac deville, cadillac deville, pcm 5

Question
Is there a code reader for a 1993 Cadillac Deville?  How do you read the codes?

Answer
1. Turn the ignition switch to the ON position. Do NOT start the engine.

2. LOcated on the climate control panel you will see an OFF and a WARMER (fan up) button. Simultaneously pusha nd hold these said buttons for 3 seconds and release them.

3. Look at your fuel data display and you will see LETTERS & NUMBERS appaering along with either the word HISTORY or CURRENT.

4. The display will stop at PCM?

5. Turn ignition OFF.

Tell me what LETTERS & NUMBERS appaer with either the word HISTORY or CURRENT.