OBD I Location?

[Espritman]

Lots of excellent suggestions for resolving my previous 'Engine Miss' problem on our '94 5sp. The first step in nearly all of them was to use the OBD port in order to diagnose through returned codes. If I could only find the OBD I port.

I have the 'Service Manual 1993' but have been unable to locate the section telling me where it is. I've searched around the passenger footwell, the driver footwell, around and under the glovebox, etc. with no success. Where the heck is it?

 

[A.S. Motorsport]

White 2p connector top right corner of the of the passenger footwell underneath the carpeting or under the glovebox corner

 

[Larry Bastanza]

White 2p connector top right corner of the of the passenger footwell underneath the carpeting or under the glovebox corner

In US models the connector is Blue.

 

[JD Cross]

Look on page 11-18 of your shop manual for a pic of the connection and 11-20 for a list of error codes

 

[asylum]

https://www.nsxprime.com/wiki/Trouble_Codes

 

[nsxspdfreak]

The first time I had to find the connector I had to pull the knee bolsters since the connector somehow managed to get up behind it. I now have the OBD1 connector permanently connected (via a matching connector) to a micro toggle switch located in the glove box. This way I never have to play around locating the connector and jumpering the leads. Just throw the switch and read the codes.

 

[Old Guy]

Perhaps part of the confusion is that I believe the pre OBD II NSXs (I don't have one so I can't be 100% sure) do not have a communication port. The pre OBD II cars have a 2 pin service check connector which you short out and then look at the blinking check engine light and (try) count the long and short dashes to determine the error code. OBD II is a standard, part of which included a communication port with a standard communications protocol to 'talk' to a reader with a minimum standard set of error codes. Various manufactures added in extended special codes to deal with special stuff on their cars; but, they still supported the basic codes and communication protocol.

People talk about OBD I. Some people think that OBD I implies a standard that preceded OBD II. The only thing OBD I means is all the stuff that preceded OBDII; but, is not OBD II. It would probably be more accurate to label it ' the OBD thingy that is not OBD II'. As a result you will find some pre OBD II systems that do have communication ports that will talk to a vendor specific code reader. Others will be more rudimentary (like Honda) and require that you watch a flashing light and be able to count up to at least 9. At least the Honda system had the advantage that it did not require some expensive factory code reader.