SCT tuner wont power on!

[Jbauer]

Hey guys check this out.
I have a tune installed on my car... so i go and try and take the tune off yesterday..i plug the SCT tuner in.. it wont turn on... the odometer reads - - - - -..like it should, but the tuner itself wont turn on or make that noise it should make when powering on.

So i try it on 3 other cars...this frikin thing turns on and works just fine on all there cars..but when i plug it into mine..it wont work!!!

so i figure my OBD port is the issue...so i check all my fuses..all are fine. So i go to autozone to see if there scan will power on with my OBD port...it DOES! ...emissions test... plugs in and powers on the emissions testing computer just fine... go plug in SCT tuner.. EPIC FAIL!

WTF!! The good ole' boys at SCT are stumped, and so am I. what on earth!
Can anyone offer me any help!?!

Thanks

 

[mustang51js]

check to see if anything is wrong with the port in your car, dirt,stuff like that,or try and move it side to side, maybe the port in your car is expanded where its not making a connection

 

[Jbauer]

trying that, still no go.

again, the port works with all other devices except the SCT tuner. its like my Tuners holding a grudge

 

[wmburns]

Assuming that the car is a 1999-2004.

Confirm fuse F2.31(10a) in the CJB is good.

Confirm 12 volts in DLC pin #16. The wires are LG/RD. Pin #16 should be on the upper left of the connector (narrow side up).

Confirm good ground in DLC pin #4 (BK) and pin #5 (BK/YE). Ohm it out with a known good ground or better yet, back to battery neg.

 

[Jbauer]

yes it is a 99-04
i have also had a sub/amp/radio recently installed to the mach 460 if that matters

how do i 'ohm' check pins 4 and 5? i dont have a meter, should i go out and buy one?

i am getting power to pin 16.

 

[wmburns]

Suspect that the radio installer removed/damaged ground G204 located center console very near the radio.

Ohm means to take a resistance measurement. A volt-ohm-meter (VOM) will measure the resistance to the flow of electricity. Suspect that you will find an excessively high reading indicating the ground is not good.

If you have a volt meter, most also come with an Ohm meter. Or at the very least a go/no go tester.

Optionally, measure the voltage between pin #16 and the grounds on the DLC connector. If the ground is weak, the voltage may be less than battery. The down side of this method is that it does not load circuit. A weak ground my work at very low currents but have excessive voltage drop at higher levels. This is why it is better to measure straight resistance.

Of course if the ground is missing out right, the voltage measurement will be zero thus confirming the diagnosis.

 

[Jbauer]

copy that, i will be searching location of G204 tomorrow and report back, thank you!