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DTC P0601 / P0602: Internal Control Module Memory Check Sum Error / Control Module Programming Error
System Description
Internal control module is installed in ECM.
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
DTC P0601:
Data write error or check sum error
(1 driving cycle detection logic)
DTC P0602:
Data programming error
(1 driving cycle detection logic) 		ECM
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it at idle if possible.
4) Check DTC and pending DTC by using scan tool.
DTC Troubleshooting
Step Action YES NO
1
DTC recheck
1) Clear DTC referring to DTC Clearance:M13A with VVT .
2) Turn OFF ignition switch.
3) Turn ON ignition switch and check DTC.
Is DTC P0601 or P0602 still indicated?
Go to Step 2.
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
2
ECM power and ground circuit check
1) Check that ECM power supply circuit and ECM ground circuit are in good condition referring to MIL Does Not Light with Ignition Switch ON and Engine Does Not Start Though It Is Cranked Up:M13A with VVT .
Are checking results OK?
Substitute a known-good ECM and recheck.
Repair ECM power or ground circuit.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.