RS232 Cable Instructions


Solder the white 4 pin header into spots 1-4 on your ECU in the spot labeled CN2.  The cable is already pinned correctly but here is the pinout.
 
This is how you connect the cable to your ECU.  It is pinned correctly as is.
 
Serial Adapter
        ECU SIDE
RS232 -->TTL
        CN2 plug
 
  
          Brown = Ground
 GND
       PIN 1 (GND)
          Yellow = Receive
 RX
       PIN 2 (TX)
          Red = +5 volts
 +5V
       PIN 3 (+5v)
          Orange = Transmit
 TX
       PIN 4 (RX)
                |  
       PIN 5 NOT USED
 
Nick of ECUControl has a good write-up as well. Please refer to it if you need further assistance.
 
http://ecucontrol.com/how_to_mod_my_ecu.htm