Your ELM327 works only with OBD-2 protocol
You need to buy ELM327 on a PIC chip
https://www.youtube.com/watch?v=TeeUCoppzJc

1. Yes, it's him.
2. It is possible, the main thing that the ECU responds.

CAN-Chip TJA1040
pin №6 and №7 remove the resistor

program:ELM327Chat_Android
https://yadi.sk/d/hgeBI7L23Y3mGf
Command:ATPPS

New ELM327 PIC18 + 4MHz + no R 120om
https://ru.aliexpress.com/item/OBDII-EL ... 0.0.hddDk2

PIC18F25K80 ???
https://youtu.be/vMaOS8ARpBI
Checking The ELM327 :
https://youtu.be/plz7zxEiSZA

At you the basic chip " STM32F032 - a drop" You need the main chip " PIC " ==================================== Problem: COMMAND: ATSP C The operation has timed out. 0 - Automatic 1 - SAE J1850 PWM (41.6 kbaud) 2 - SAE J1850 VPW (10.4 kbaud) 3 - ISO 9141-2 (5 baud init, 10.4 kbau...

ELM327 disassembly

https://youtu.be/vMaOS8ARpBI

Demand PIC

https://ru.aliexpress.com/item/2014-New ... 0.0.dAQAjz

Matchigo,
The PIC chip is a guaranteed success.
The STM8S207 chip is in doubt.