I built a harness for tuning on the bench. It has the Red and Blue PCM connectors, DLC connector, On-Off switch and battery clips. The wiring is as follows. DTC connector: pin 2= Data, pin 4 &5= GND, pin 16 =+12V.....The PCM is 12200411, 2003 5.3. PCM wiring is pin 58 =data , grounds and constant and run/start power. This setup DID NOT work with my non HP Tuner scanner that IS OBD II compatibke. I have not yet received my HP Tuner Suite so the VAT is not masked.
I'm sure one of you has solved this problem, if I have one?
I built this to get a head start as the motor is a transplant for my '55 Chevy. HELP ??