pretty easy to check your fluke for reference- test a couple of batteries...time to check the smoke detectors anyway...check your fob battery etc.
I've never had one fail...only the display connections

now my 5.01 measurement yesterday was at your direction...I didn;t take the time to follow the wiring diagram.

but 5 VDC is standard control voltage on efi systems

mike

 

Like Mike, I just checked as well and have 5.0 +/- .1 using my Fluke 179 RMS and just for grins, I used my old analog. After I squinted at the needle, I see 5 VDC. Both meters have been calibrated in the previous 12 months.

This is a strange problem. I would think the ECM would step down the voltage using one resistor and if it failed, you'd have 0 VDC, not half of the reference.

A question... Have you tried powering everything off, hooking up the meter and then power everything on? Do you initially get 5 VDC? I think your DMM has a high hold so you can capture the peak?!?

Yep, use a AA and a 9 volt and check your meter to see what it says.

 

Dudes...

Want to thank you all for suggesting it might be my Fluke. It was...

The thing would read 12Volts all day but anything under that was suspect.
I took the think apart and replaced the 9Volt battery in the little puppy and suddenly I read 4.99 volts on the control lines...
Also picked up a Walmart priced meter for reference and it read 4.97. Far from 2.9 Volts.

So yeah, I'm telling on myself. Stinking meter had me all worried. I probably need to get the thing calibrated now but at least I know my ECM is fine.

Appreciate the help guys.

lp

 

Glad it worked out... a 9V battery is certainly cheaper than a new ECM..

 

from time to time, I use a multi-meter in my business. I have found that even when it's working correctly, it will send me the wrong direction more times than not. I have found that going by the seat of my pants works much better. Not so sure that this helps you, but I would not depend on a multi-meter much at all.