Harvey Yancey

I attempted to get my car inspected today but the ODB-II machine at the inspection shop could not connect despite repeated tries. When I got home this afternoon I tried my portable OBD-II reader and it would not read either. I double checked against my wife's 993 Cab and it connected fine.

I searched Rennlist and did not get any definitive hits, however when I did a boarder search on the web I found that other people with this problem (non-Porsche btw) usually found that it was simply a fuse which makes sense.

With that I set about looking for the fuse that controls the OBD-II port ... with no success.

Does anyone know which fuse it is? Or if it's not a fuse what the fix is?

TIA

993inNC

Was the immobilizer on or off? Car needs to be able to be started for the computer to be read, with the ignition lights "on" but no motor running

Harvey Yancey

I've ran the diagnostic before so everything was the way it should be to be read correctly.

BTW - My immobilizer is disabled (Protomotive fix after the immobilizer puked a while back).

Harvey Yancey

Bump for the Monday morning crowd ...

Garth S

Check fuse #12 (15A): the OBD II port appears to be powered in conjunction with the (deleted) immobilizer, clock, and tack ....
A dead give away would be if the latter two are currently lame if not the case, perhaps inspect the wiring on the deleted immobilizer??

Harvey Yancey

The clock and the tach are fine but there was some creative wiring changes around the R61 Start Relay in the fuse box.

We had to remove this relay and bridge pins 30 and 87 so the start circuit was complete.

I will check #12 though.

jimq

There is one marked in the front fuse panel on my 964 but the car is at home so cant help you.

Harvey Yancey

thx ...