Page 1 of 1
Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 10:37 am
by Bootlegger137
I am having issues with my Port engine on my 396. The engine (once started) runs rough at idle, oscillating between 700 and 1000 (Approx) RPMs, Sometimes it will level out for a bit, only to start oscillating again. Once on the water, the engine will not reach 3000; which means my SLOW circuit is activated. I decided to buy diagnostic software from Diacom, along with a few nifty plugs to plug into the EEC to read the codes.
The only problem is, I can't seem to find where this diagnostic port is on my Volvo Penta 8.1 Gi Engine. Does anyone happen to know where it is?
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 11:44 am
by bud37
Is the rinda/diacom adaptor round , how many pins ? Usually/may be close to the ecu, it may be tie wrapped away/hidden if it has never been used.
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 12:04 pm
by Bootlegger137
The plugs are both rectangular IAW the specs from the Diacom website. I have been looking all over the engine-attempting to trace the wires coming out of the EEC to a downstream location. I am not sure why this should be so hard.
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 12:05 pm
by Bootlegger137
And the EEC:
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 12:16 pm
by bud37
Yup those look like what I had.....different engine but there was a dead ended plug with a cap to keep it clean.......took me a while to find as they were pushed down under the harness........just get a bright light and go slow you will find the data port......sorry I don't know the exact location for that engine.
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 12:49 pm
by Bootlegger137
I found it. It was located under the fuse box; after removing a cover, there it was.
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 16th, 2021, 11:11 pm
by buster53
A couple of issues come to mind that could cause your problems, all fuel related.
Bad gas, water and/or trash in the tank, fuel filter(s) clogging up (each engine may have 2) anti-siphon valve needs replacing, fuel injectors getting clogged with trash.
Re: Diagnostic Port Location(?)-2003 Carver 396
Posted: October 17th, 2021, 9:53 am
by Viper
Not necessarily. Usually if that's the case, there will be an engine alarm going off at a regular interval to indicate that. Are you getting a regular beep?