55 A/D Error
The PCM receives analog voltage signals from various sensors and converts them to digital square waves. If there is a problem with the conversion process, Code 55 will set.
- Code 55 will set if:
- The analog to digital conversion takes too long.
- The low voltage of a square wave is greater than 0.1 volt.
- The high voltage of a square wave is less than 4.88 volts.
- Code 55 indicates an internal PCM malfunction. The PCM should be replaced.