Remove this part in the code and retry
Quote:
// ask protocol
elm_command(str, PSTR("ATDPN\r"));
// str[0] should be 'A' for automatic
// set header to talk directly to ECU#1
if(str[1]=='1') // PWM
elm_command(str, PSTR("ATSHE410F1\r"));
else if(str[1]=='2') // VPW
elm_command(str, PSTR("ATSHA810F1\r"));
else if(str[1]=='3') // ISO 9141
elm_command(str, PSTR("ATSH6810F1\r"));
else if(str[1]=='6') // CAN 11 bits
elm_command(str, PSTR("ATSH7E0\r"));
else if(str[1]=='7') // CAN 29 bits
elm_command(str, PSTR("ATSHDA10F1\r"));
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