Does anyone know how to read the error codes on an EEC-IV computer

I understand there is some way to get the error codes to display on the dash?

 

Not that I know of, the dash thing is only on a Chrysler as far as I know. I used to work at the factory that made the EEC modules and I believe the only way to read the codes is to buy a code reader.

 

You can retrieve self test and stored codes using the Malfunction Indicator Lamp (MIL) - aka Check Engine Light.

Connect a jumper wire between the Self Test Input (STI) connector and Pin 2 of the Diagnostic Test connector under the hood. Codes are transmitted by place value with a pause between digits. A longer pause divides separate codes. You can run both a Quick Test (KOEO) and Engine Running (KOER/ER)

The Chilton's manual describes the procedure; and Haynes also has a picture and diagram.

I understand that AutoZone and other parts stores will read the codes free of charge.