Anyone willing to take a quick voltage check for me?

Mountainman · **Posted:** Tue Jul 14, 2020 3:33 pm

Anyone brave enough to measure V on pin 2 of the OBD port with the key in the on position, and then at an idle? With a healthy a no check engine lights (no hard faults) jeep.

If you are, make certain your meter is set to the 20volts DC range for both measurements. Please use one of the bolts on the door or under the dash as a ground so I have an apple to apples comparison.

*Caution! Only do this if you're confident that you know what I'm talking about. A resistance (unlikely) or current (very likely) measurement could fry one of the control modules!

Long story short, my PCI Bus is not talking...

casm · **Joined:** Sun Jan 29, 2006 5:05 pm **Posts:** 694

Just to make totally sure as to what you're looking for a measurement from:

By 'pin 2', you're referring to the one marked, "SAE J1850 BUS+" in the picture above, correct? Just double-checking since there's room here for frying things.

Mountainman · **Posted:** Tue Jul 14, 2020 4:35 pm

Yup, that's it. Thanks for posting the image!

casm · **Joined:** Sun Jan 29, 2006 5:05 pm **Posts:** 694

Mountainman wrote:

Yup, that's it. Thanks for posting the image!

OK, here's what I measured:

Key in 'run', engine off: 12.4VDC
Key in 'run', engine on: 14.4VDC

My ground point was the frontmost bolt for the driver's seat on the side next to the transmission tunnel. 811 ECU, no faults stored and no MIL illuminated.

Mountainman · **Posted:** Tue Jul 14, 2020 10:50 pm

casm wrote:

Mountainman wrote:

Yup, that's it. Thanks for posting the image!

OK, here's what I measured:

Key in 'run', engine off: 12.4VDC
Key in 'run', engine on: 14.4VDC

My ground point was the frontmost bolt for the driver's seat on the side next to the transmission tunnel. 811 ECU, no faults stored and no MIL illuminated.

Many thanks! I have about 1 volt in either state... I'm surprised my jeep runs!

Anyone willing to take a quick voltage check for me?

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