Look at the following video demonstrating how to use ECUHELP KT200 to write Mercedes CRD3PLUS.A0 on without any issues.

Alright, what about the wiring diagram?
Firstly, how to connect CRD3PLUS.A0 ECU on Bench with KT200?

Kit to use:
– Multifunction cable
– Bench Box v.2

To read and write use the following driver:
→ BENCH MODE
→ MERCEDES BENZ
→ TC1797 – MERCEDES
and choose:
→ CRD3.1x
→ CRD3.2x
→ CRD3.3x
→ CRD3.4x
→ CRD3.5x
→ CRD3.6x
→ CRD3.7x
→ CRD3PLUS.A0

Then, how to connect CRD3PLUS.A0 ECU in Boot mode with KT200?
Kit to use: Multifunction cable & 3 resistore 1000 Ω

Read and write ecu CRD3PLUS.A0 with KT200:
Connect with the multifunction cable the following
pinout and the boot are shown below.
Use the driver:
→ TOOLS BOOT MODE
→ INFINEON TRICORE Boot
→ SAK TC1797

That’s all, thanks.

This is the two optional methods of reading/writing ECU CRD3Plus.A0 Mercedes using ECUHELP KT200.