DTC P1608: Powertrain Control Module (Pcm) Malfunction Or DTC P1609: Powertrain Control Module (Pcm) Knock Circuit Malfunction: Condition

DTCs are set when Powertrain Control Module (PCM) does not read DTCs from output devices. Cause is malfunctioning PCM. Replace PCM and erase any DTCs present. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - MIATA & MILLENIA article. Retest vehicle.