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How To Guide:

Source: LAUNCH TECH CO LTD

LAUNCH Volkswagen Audi MQB Engine Replacement Guide

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Operation instruction of ECU replacement function


Function introduction:

MQB engine ECU replacement, advantages:

  1. Replacement can be done even if the original engine is completely damaged and without reading from original engine ECU;

  2. X431G3 can also operate the replacement for vehicles that are unable to perform the function of online replacement via special test since the data is modified by devices of the third party.


Condition requirements：

Equipment requirements:

  • PRO and other Android devices of X431 products,

  • X431G3 Immobilizer programmer;

Software requirements:

  • Audi V28.70 and above.


Description of replacement conditions

  1. Anti-theft data of external engine ECU;

  2. The instrument Anti-theft data of target vehicle, with a key which can start the vehicle in hand.


Steps：

  1. First determine the type of engine that needs to be replaced, which can be determined by the label on engine ECU;

  2. Read the anti-theft data of external engine ECU through BENCH mode;

  3. Determine the instrument type. If it is JCIMQB, you need to enter the online anti-theft to read instrument data, while NEC35XX MQB instrument directly enters the replacement to obtain original anti-theft data and read it;

  4. Enter【MQB Instrument】-》【Replacement Of Parts】, load or enter relevant Anti-theft data, and execute the replacement process;

  5. Clear DTCs to start engine.

Detailed steps：

1. The location of the engine ECU of this vehicle is shown in Figure 1 (no need to

read original engine ECU, it is directly connected to the external engine ECU to read

operations);

2. Enter Audi software，

【Local Diagnose】-》【Special Function】-》【Anti-Theft Function】-》【Engine】-》【BENCH Mode】, and the menu is shown below

3. Select 【MED17.5.25 TC1782】 according to the type displayed on the label of external engine, and enter the function as shown below;

4. Click the 【Wire Connection Diagram】 menu to display the connection diagram of this engine, as shown in the image below.

Connect the Anti-theft programmer to external engine ECU according to the wiring diagram, as shown below;

5. Click【Read Chip ID】to check if the wiring diagram is correct, and then perform 【Backup EEPROM Data 】 and 【Backup FLASH Data 】 respectively. The process of reading FLASH data is shown below. Note: You need to wait for 3 to 4 minutes to complete reading since the FLASH data of engine is large, please be patient;

6. After the EERPOM and FLASH data of engine and ECU are all read, use the

【FLASH&Eeprom Data Decryption】function to decrypt the Anti-theft data of

engine ECU, and respectively load the FLASH data and EEPROM data that are read

just now, as shown below, and then click the Decode button;

7. The data decrypted by engine ECU is saved as the replacement data. In this step, no need to manually input engine relevant Anti-theft data when replacing, as shown below

8. The external engine ECU Anti-theft data is shown below, which can be saved

by screenshot;

9. Exit engine function and enter 【MQB Instrument】-》【Replacement Of Parts】-》【Engine】, as shown below;

10. After entering the function, click【Edit1】to directly load the Anti-theft data parsed by previous BENCH mode, as shown below.

11. Click【Edit2】to obtain the key from original vehicle, as shown below, insert the key into vehicle and illuminate the instrument;

12. After reading the instrument data, you need to place the key into the Immobilizer

Programmer, as shown in below;

13. At this time, both of external engine ECU data and original vehicle data are successfully read, as shown below

Click【Start Replacement】, the process is successfully performed, and the external engine has synchronized with the original vehicle anti-theft data, as shown below

14. The programming function is needed if the external engine ECU software part number is different from the one of original engine ECU, and the software part

number can be modified by manual programming.


15. Finally, you can start the engine by encoding and clearing DTCs.


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