AGSC,

 This vehicle uses OBD I.   Under the hood, usually on the drivers side of 
the vehicle, there will be a black connector.  It looks sonmething like 
shown here.

      ____________
     /            \
   /    [ ] [1]    \
  | [ ] [2] [ ] [ ] |
   ------------------

 There will also be a single connector adjacent to the one above.  If you
 connect the single connector to pin #1 above, you will put the EEC-IV into
 diagnostic mode.

 Connect a volt meter (or a 12 volt test lamp) to pin #2 (negative terminal
 for the voltmeter).  Connect the positive terminal of the voltmeter to the
 battery plus.

 Now when you put the key in the iginition and turn it on, (don't
 start the engine) the lamp will come on (or the voltmeter will deflect
 positive)The lamp will then blink off for each count in the digit.
 For example, it comes on, goes off, comes on, goes off, comes on, goes 
off, comes on, and then pauses, this is three.  And so on for the remaining 
digits.  You then look up the corresponding code to find the area of 
difficulty. 

There are several places on the web to look these codes up.  If you can't 
find any place else, let me know and I'll look the up for you.

                                                Regards,

                                                  Jim   




> Slightly off the subject
> 
> Before ODB II ( about 1996 I guess ) there were proprietary
> diagnostic schemes.  Is there anyplace to find out information about
> these ?
> In particular, Ford Explorer 1991
> 
> Thanks
> 
> AGSC
> 
> 
> Augustus Gustavius Salvatore Calabrese 720.222.1309    AGSC
> www.omegadogs.com   Denver, CO      cell 303 908 7716
> If SPAM filters bounce mail, try
> ags.calabrese@hotmail.com
> 
> 
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