CG100X Repair Audi Rear Tailgate Module D70F3373

How to read and write to repair Audi rear tailgate module using CG100X.

 

Symptoms: electric rear tailgate malfunction

Common Models: Audi A6 C7, A8 D4, A7

 

Common causes:

Most likely, the fault is in an electronic ( computerized ) module that controls these motors and associated sensors. Audi rear tailgate issues are often caused by water damage to the module, faulty latch sensors, or damaged wiring harness.

 

Repair: repair the tailgate module processor MCU (Renesas D70F3373)

 

Device used: CG100X programmer

Instruction:

Remove and disassemble the Audi rear tailgate module.

This is the processor MCU: D70F3373.

Follow this pinout/wiring diagram to connect module with CG100X programmer via MCU cable.

NOTE: One section needs to be cut off, and after the repair is done, it needs to be welded back in place.

In CG100X software, go to Programmer function. Search D70F3373
Read and save original Pflash and Dflash data.

Modified the Pflash and Dflash data manually.

Then write the modified Dflash and Pflash back to the tailgate module.

Then install the tailgate module back to vehicle.

Tips to Read Hyundai MEDG17.9.8 with CG FC200

We have received feedback from customers reporting that the ECU becomes “bricked” when attempting to read from or write to a Hyundai/Kia MEDG17.9.8 unit using the CG FC200 ecu programmer.

When using the FC200 device on this Hyundai ECU model MEG17.9.8, the bricking issue is actually caused by interference from the transmission (TCU) chip.

 

The CPU architecture features shared ECU + TCU communication. When reading the engine, it is susceptible to interference from the transmission TCU chip, causing password data to conflict and sending the ECU into a pseudo-dead (bricked) state.

There are two solutions:

Option 1: Solder a 1000-ohm resistor at a specific location to eliminate the interference (check images below).

Option 2: Open the ECU shell to avoid the interference.

The most reliable method is to open the cover and remove the crystal oscillator next to the TCU chip to prevent interference. This will create a single channel and prevent the transmission from interfering with the CPU.

Then start read and write this ECU with FC200 on bench mode.