PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED! - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 5 (permalink) Old 02-13-2019, 10:40 AM Thread Starter
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PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED!

Brand new batteries + Alternator and still have a voltage drop, termials are clean, if its boosted and connected it will stay running but when i take the cables off it has about 30 seconds before it shuts off..... plugged it in and these codes came up. any ideas? could it possibly be the PCM? if its not connected with booster cables it wont even crank it will just click... please help me haha
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post #2 of 5 (permalink) Old 02-13-2019, 01:21 PM
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Re: PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED!

hard to read, but the one that says "FICM Supply Voltage Circuit Low", that's the one i'd be researching. I'd start with reading the computer for the following PIDs:
FICM Sync (should be 1)
FICM logic voltage (should be like 12V)
and the FICM Main Power voltage (should be like 48V)

...If you could report back with those, might point one of us in the right direction.


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post #3 of 5 (permalink) Old 02-13-2019, 02:26 PM
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Re: PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED!

Did you check all the ground connections?

Could you have gotten a bad new battery? I have seen that happen.

Mark
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post #4 of 5 (permalink) Old 02-13-2019, 05:24 PM
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Re: PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED!

Quote:
Originally Posted by Canadianclassicjt View Post
could it possibly be the PCM? if its not connected with booster cables it wont even crank it will just click

Nope. Start by checking the voltage at the battery while cranking. The posts, not the terminals. If it's low, figure out why. Charging system problem, a drain or bad batteries.

If it's not low, check it at the battery terminals, if it's now low, fix the terminals. If not, follow the cable up with the meter and figure out where it's losing power.

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post #5 of 5 (permalink) Old 02-13-2019, 05:26 PM
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Re: PLEASE HELP!! 2003 6.0L f250 * VOLTAGE DROP * CODES ATTACHED!

Quote:
Originally Posted by bismic1 View Post
Did you check all the ground connections?.
Yeah, that too.

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