P0605

DTC P0605 INTERNAL CONTROL MODULE READ ONLY MEMORY(ROM) ERROR

Component Location:

GENERAL DESCRIPTION
A malfunction is detected by using a checksum technique for verifying data. The digital data is composed of zeros and ones. A checksum is the total of all ones in a string of data. By comparing the checksum value with a stored value, a malfunction can be detected.

DTC DESCRIPTION
The ECM monitors RAM areas and communication connections between micro controller and output drivers and sets DTC P0605 if failure is detected.

DTC Detecting Condition:

MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.






5. Is parameter displayed "History(Not Present) fault"?
- History (Not Present) fault: DTC occurred but has been cleared.
- Present fault: DTC is occurring at present time.

YES: Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO: Go to next step as below.

BACK VOLTAGE INSPECTION
1. Ignition "OFF".
2. Disconnect ECM connector.
3. Turn ignition "ON" and measure voltage between terminal 7 of the ECM harness connector and chassis ground.

Specification : Remain stable at battery voltage






4. Are circuits remaining stable at battery voltage?

YES: Test with a new ECM and check for proper operation. If problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.

NO: If voltage fluctuates, check circuit Thoroughly for loose, bent or corroded terminals, Repair as necessary and go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.

1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?

YES: System performing to specification at this time. Clear the DTC.

NO: Go to the applicable troubleshooting procedure.