Suzuki Baleno Manual page 1434

6-2-86 ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC)
DTC P0601 INTERNAL CONTROL MODULE MEMORY CHECK SUM ERROR
SYSTEM DESCRIPTION
Internal control module is installed in ECM.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION TROUBLE AREA
Data write error or check sum error ECM
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch, clear DTC using scan tool and then turn OFF ignition switch.
3) Start engine and run it at idle for 30 sec. or more if possible.
4) Check DTC and pending DTC.
TROUBLESHOOTING
Substitute a known-good ECM and recheck.