OBD and OBD2, what fuse or fuses power the ports?

Hi,

Pics 1 and 2 below are of the computer data lines. Pin 16 on the DLC is what should have power at all times. If it doesn't, check the fuse 5 on the ETACS ECU behind the rear of the junction box (left side of the dash).

I attached the wiring schematic so that you have a reference.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below. Note: Pic 4 is just to show the location of the ETACS.

Replaced fuse 13 inside box. Voltage on pin 16 of DLC returned. Barrowed a small scan tool, not sure about what I got from it. Code was V0100. Said lost com with EEM/PCA A and also said ISO/SAE reversed. Maybe you can get something out of it or lead me the correct way.
Thanks,
GaryN77

Hi Gary, could it be a U0100? There are no V codes. Also, I need to know which circuit was giving you trouble. A U0100 can be related to a few different areas. See pic below.

Let me know.

Take care,

Joe

See pic below.

The code was U0100 as you thought. I got a new scanner yesterday and played with it for a while but the only thing I saw was the U0100 code and it showed "ECM lost comm with PCA A". Also said ISO & SAE reversed. I'm going to have to put some time with the scanner to be comfortable with it, It is a Zurich Model ZR13S OBD@ reader. They weather here in PA is going to be bad so I'll. Have time to learn The car is outside and will not turn over now. I will keep in touch.
Thanks,
GaryN77

On an automotive scan tool or diagnostic equipment, "ISO" and "SAE" reversed typically refer to the two primary communication protocols used in modern vehicles for onboard diagnostics and data exchange between the vehicle's electronic control modules and the diagnostic tool. These protocols are known as ISO 15765-4 and SAE J1979.

When you see "ISO & SAE reversed" on a car scan tool or diagnostic device, it likely means that the tool has the ability to switch between these two communication protocols, allowing it to work with a broader range of vehicles from different regions and manufacturers.

The U0100 trouble code indicates a communication problem between your vehicle's Engine Control Module (ECM) and the Powertrain Control Module A (PCA A). This code is typically associated with a network communication issue within the vehicle's onboard diagnostic system. If possible, let me know what system is causing issues so I can go into the diagnostics.

BTW, welcome to PA. I'm near Pittsburgh. LOL

Joe