Need an EFI tech!

[ripperdog]

tmoss,

You are 100% correct. My mistake...I've been away from this stuff for almost 4 years. The MAP/BP sensor's digital output is converted to analog by the computer and can only be read as frequency with an oscilloscope or a specialized MAP/BP tester. I have access to neither at the moment so I'll just have to wait untill I can borrow a "known good" sensor.

The thing that struck me as most odd was that, according to the KOEO codes, a combination of 7 sensors, switches and actuators are reading faulty or out of range. I can see the possibility of a couple being bad but what are the odds of 7 going bad at once? Can one bad sensors cause all the rest of them to fail? Or should I be looking for a common thread such as a faulty SIG RTN wire?

I was hoping to find someone more experianced at dealing with these kind of problems to get me pointed in the right direction. I'd rather fix it in the car than have to rip-out the whole system and disect it on the garage floor.

Thanks for the help...keep the ideas coming!

[tmoss]

Some newer multimeters have a frequency function and very high input impedance, so the frequency can be read with them too. Yes, I would look at the sig rtn wire or the regulated 5v vref that they use. I use an older Fluke 8060A for that function. I have some nice color diagrams you could use at:

www.veryuseful.com/mustang/tech/engine