Some users reported that they had problems connecting Dodge/Jeep JTEC ECUs with Godiag GT100 obd2 breakout box.
Here are the tips to use the godiag with these JTEC ECUs.
You will have issues on these with Jtec, Jtec+, and Sbec computers.
The solution is a good 12VDC 5A power supply and the crossover.
When trying to bench program a JTEC with GODIAG, you need to move the SCI signal on 6 to 12.
The reason it is needed is because OBD2 Pin 6 is CAN and the GODIAG tool attempts to condition the line voltage. During programming the voltage goes to 19VDC much like the Ford FEPS. Moving the connection to OBD2 Pin 12 makes it work.
Require an OBD2 Pin 6 to OBD2 Pin 12 crossover when using GODIAG on JTEC (Dodge/Jeep) Controllers.
Bench Force is now making the cables. or search “OBD-II Pin 6 & 12 Swap Harness” on google. It takes $65 or so.
Once you put it inline before the GODIAG GT100, Connect Pin 12 to the PCM instead of 6. 6 is designated for the CAN line and the electronics don’t like the 19V programming signal. Also make sure you have a better power supply than the GODIAG comes with.
The FLEX Power Supply is a good one. Chrysler of that age does not like 14VDC so maybe get one that runs closer to 12VDC.
The Jtec’s apply 20 volts and Sbec’s 13 volts on receive line for 10 seconds to put ecu into bootloader mode. Also, after each data block is transmitted to the ECU, programming voltage is applied during the reception of that data transfer.
We will report this issue to Godiag team. They will develop a better alternative solution/crossover.