How to Perform Vehicle Identification Number (VIN) Writing

HOW TO PERFORM VEHICLE IDENTIFICATION NUMBER (VIN) WRITING
The Vehicle Identification Number (VIN) is stored in the ECM or the PCM by the vehicle manufacture. If the VIN to be stored in the ECM or the PCM is eliminated fraudulently, the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates and Diagnostic Trouble Code (DTC) No. P0630 (VIN malfunction) is shown. When the ECM or the PCM is replaced, and entry of the VIN necessary due to DTC No. P0630 (VIN malfunction). Enter the VIN in accordance with the procedure as follows:

Writing Procedure
Required Special Tool:
^ MB991958: Scan Tool (MUT-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: MUT-III USB Cable
^ MB991911: MUT-III Main Harness B

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the ON position.
3. Confirm DTC No. P0630 (EEPROM malfunction) is not shown.

NOTE: When DTC No. P0630 (EEPROM malfunction) is shown, the VIN cannot be stored even if entered. Therefore, the troubleshooting is performed when this DTC is shown.

4. Select Coding form the menu screen.
5. Select VIN writing form the menu screen.
6. Enter the VIN.
7. After entry of the VIN, turn the ignition switch to the LOCK (OFF) position. After ten seconds or more passed, turn to the ON position again.
8. Confirm DTC No. P0630 (VIN malfunction) is not shown.

NOTE: When DTC No. P0630 (VIN malfunction) is shown, enter the VIN again because that would be not appropriate.