Chris, thanks for the heads up. Is that one line on the throttle body sufficiently large enough to cause such a problem? I wouldn't have guessed that.
John, I realized I forgot to say where it was. Usually the connectors are in a cover that is mounted to the driver side firewall or just hanging loose. There's the big black one (foreground) and a little gray one (background). Both should be in the cover or close by to each other. The yellow jumper goes from the black connector to the gray one.
Yes, you count the flashes. Codes will be transmitted twice. If you have a pre-91 EEC-IV it will have two digit codes. 91 and later has 3 digit codes. The first set of codes will be the results of your self test. Then there will be a long pause followed by a beep followed by a long pause. The next codes will be continuous codes. These are the ones that occurred while actually driving.
If you start the car, you can also do the Key On Engine Running test. This will test stuff like the IAB. For more information, read the article on Corral.Net in their technical section.
Just as and FYI for anyone interested, the terminal on the right most side of the picture on the black test connector is the fuel pump test lead. You can use a jumper from there to ground to run the fuel pump while the ignition key is in the on position. This is the way you should set your fuel pressure with an adjustable fuel pressure regulator.
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351W 89 Mustang GT Convertible
[This message has been edited by jimberg (edited 08-19-2001).]