Pcm case ground

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Nov 24, 2015 | 02:05 PM

DocV8

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Pcm case ground

I have pcm case ground at 30,71 volt with car gauge pro ---
see my post with my big idm problem

please help

Nov 24, 2015 | 02:14 PM

jhl3

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From: Asheville-where weird is

Are you stating that you are seeing 30.71 VDC at ground on the PCM?

If yes, could you verify this with a standard volt/ohm meter?

Has anyone removed or changed the wiring on your batteries? If yes, make sure they are not in series and being charged.

Nov 24, 2015 | 02:24 PM

DocV8

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Quote:

Originally Posted by jhl3

Are you stating that you are seeing 30.71 VDC at ground on the PCM?

If so, could you verify this with a standard volt/ohm meter?

Has anyone removed or changed the wiring on your batteries? If so, make sure they are not in series and being charged.

On case there's 0 ohm to ground - my batteries are not in series - they are parallel --- my right side dies on the road

Nov 24, 2015 | 02:29 PM

jhl3

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From: Asheville-where weird is

Quote:

Originally Posted by DocV8

I have pcm case ground at 30,71 volt with car gauge pro ---
see my post with my big idm problem

please help

OK. Please explain the "30,71 volt" from above.

Quote:

Originally Posted by DocV8

On case there's 0 ohm to ground - my batteries are not in series - they are parallel --- my right side dies on the road

OK.

Are they being charged?

Nov 24, 2015 | 02:40 PM

DocV8

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Quote:

Originally Posted by jhl3

OK. Please explain the "30,71 volt" from above.

OK.

Are they being charged?

Yes both are full -----

Nov 24, 2015 | 02:42 PM

DocV8

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Quote:

Originally Posted by jhl3

OK. Please explain the "30,71 volt" from above.

OK.

Are they being charged?

I have seen the 30.71v in car gauge pro and don't understand why

Nov 24, 2015 | 02:48 PM

jhl3

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Joined: Sep 2014

Posts: 2,404

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From: Asheville-where weird is

Quote:

Originally Posted by DocV8

I have seen the 30.71v in car gauge pro and don't understand why

Maybe the car gauge pro is incorrect. Do you have a standard volt/ohm meter that you can use to verify the reading.

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Nov 24, 2015 | 08:27 PM

Pikachu

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From: Amarillo, TEXAS!

I'm pretty sure there's no PID for "PCM case ground." Just because it exists in Car Gauge Pro, doesn't mean it's relevant.

Nov 25, 2015 | 05:25 PM

#10

Zwalters

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Joined: Mar 2007

Posts: 491

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From: Kingsland, GA

Grounds generally should be 0 Ohm or way less that 1 ohm (I don't get worried on automotive grounds showing a 0.1 ohm resistance, most of the time you get resistance on ground checks, it's due to surface corrosion, clean and repeat). If you have 0 vdc from anything that should be grounded to ground is good, means there is no potential voltage between the two measurement points. It's like measuring on the same post on the battery, no voltage potential exists. Grounds should read 0 vdc when checked to other grounds unless they are isolated grounds or different circuits, I don't know of any of those type circuits in our trucks.