basically, it would be on the serial end, i.e. tie the orange and yellow wires together, or since you have a 6 pin connector just stick a paperclip in the pin openings. in mptune under setup/com port there is a VERY simple program that tests the ftdi cable can communicate on the tx/rx lines. if that works then obviously the connector to/from the ecu isn't working.
the log file should look like this basically when it works.
mpscan ver - 2.0.3.0 (8/13/2015 08:49:04 AM)
Microsoft Windows 7 Professional - Win32NT
trying to open port COM1 - ctlrecord_click
got a good port back - ctlrecord_click
try to open port COM1 -initport
COM1 is a legit port -initport
usb is available on COM1 -initport
usb ftdi serial number 12WQC1T3 is available - initport
setting port baud rate to 976
ftdi open successful on COM1 -usbportinit
using protocol LM:0
attempt to change ecu baud rate to 7812
Sending byte 18
Received 1 byte(s): 255
Sending byte 18
Received 1 byte(s): 255
Changing mpscan baud rate to 7812
Sending byte 18
Received 1 byte(s): 123
Sending byte 18
Received 1 byte(s): 18
Byte 18 was sent 2 times to make the change.
usb ftdi
Successfully opened port - ctlrecord_click