No computer codes

I have a '93 Crown Victoria. The PCM is not giving out any computer codes.

Unless the check eninge light is on, there may not be any codes to "give out".

the engine light does not have to be on to get computer codes. probly why u dont get any codes is because if u have a bad sensor and it is sending a high or low signal to the PCM that number might be in a certain range that the PCM is with at the factory and runs the car perfectly with, and if it does not go higher or lower than that range the PCM will not set a code.