Communicating to ECU problem

hello every one
i have ECU model : siemens continental SIM2K-34VR
and i want to communicate to it by can protocol i have sent this pid request :
txHeader.DLC = 3;
txHeader.IDE = CAN_ID_STD;
txHeader.StdId = 0x7DF;

TxMessage.data[0] = 0x02;
TxMessage.data[1] = 0x01;
TxMessage.data[2] = 0x00;
TxMessage.data[3] = 0x00;
TxMessage.data[4] = 0x00;
TxMessage.data[5] = 0x00;
TxMessage.data[6] = 0x00;
TxMessage.data[7] = 0x00;

but the received can message is this :
ID: 0x1C3
Rx: 0x00 0x00 0x0D 0x08 0x00 0x00 0x00 0x00

i haven’t connect anything else to ECU just +12V and GND and SWITCH power
is it because of this ?or sth else?

how can i found the standard iso of my ECU i search all around the internet but didn’t get anything usefull

appreciate your help.