DTC P0601: Pcm Memory Error DTC P0603: Keep Alive Memory Error
WARNING: This page is about a different car, the 1999 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Clear DTC(s). Start engine and let idle for one minute. If DTC(s) reset, replace PCM and retest system. If DTC(s) do not reset, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article.