At this point, it looks this DIYer might need to make a trip to the shop. The MAP sensor read 28.1 inHg, which I think is in proper range. MAF is .296 lb/min (don't know if that's ok or not). The rest of the scanner readings are Greek to me. Since I don't know of any reference available to explain what they mean, and what's a red flag, I'm pretty much flying blind. That's why you guys get the big bucks. I'll review your posts and make sure I do the best I can to follow your instructions. As for the monitors, since I don't see any mention of those in the scanner menu, I'm going to guess they're only available on the higher priced scanners. The AD310 does live data monitoring, but I don't think that's what you're referring to. Thanks again for your help and patience!

 

Auh now there is something.... info we should have gotten earlier. The AD310 look at the I/M Readines (other name is the MONITORS)
Let me know what you find.

 

I had mentioned early on about the AD310 being the scanner I was using, but you're probably extremely busy, so I can see how you might have missed that.

Well, I just tried to get the I/M info. I was able to get it with the engine off, but when I cranked it up, it went through a series of "Waiting for vehicle to respond" messages, cycling through protocols, with a progress bar, and took about 20 seconds to finish. (That didn't happen with this morning's test) The screen I was left with didn't allow me to see any individual data. When I clicked Enter on a line item, I got a message to turn off the engine, and when I did that, it told me to turn the engine back on. I was never able to read the individual items, and wound up with a Failed to Connect, Link Error message.
Here's what it showed with engine off:
Oxygen Sens Mon: INC
Oxygen Sens Htr: OK
EGR System: INC
Evap System Mon: INC
Sec Air System: N/A
A/C Refrig Mon: N/A
Comp. Component: OK
Catalyst Mon: INC
Htd Catalyst: N/A
MIL Status: ON
Misfire Monitor: OK
Fuel System Mon: OK

 

No I missed what you were using, 9 vehicle forums a day and try to help only a few members on each. LOL
Interesting..... generally the basic I/M Readiness is done with the key set to on but not start engine just like you would for DTCs? Your AD310 is a quality scanner! The run on test is generally the best way to test real world operation of the emission monitors

That test result if accurate(?) is showing you have issues unresolved?
OK means system good to go
INC Incomplete means look for issues
N/A not applicable to your vehicle

 

Bear with me on this one: I ran a re-test of the voltage on the MAP sensor today, and the result was the same. Here's the part that confuses me: When I test the Signal wire with key on, I get the appropriate 5 volt reading (from the terminal AND a back probe. When I plug the sensor back in and test the voltage on the back probe, it drops to 2.66 volts. A vacuum test on the MAP air port does reduce the voltage. So, should I be seeing the voltage drop to 2.66 on the back probe when I connect the sensor, or is that a red flag?

 

Ok so you need to start engine and test the voltage . There are better ways while in the vehicle, but it so much to try to type lol. Maybe a good NONE DIY HOW-TO test a MAP tester? Do not use DIY armature based videos. Most are way inaccurate if not incorrect.

While it is out you should clean it with sensor safe spray cleaner and let it completely dry before installing it back into the system.
Do not use anything else except sensor safe cleaner!!!!