ficm logic voltage at 3 volts! - TheDieselGarage.com
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post #1 of 4 (permalink) Old 02-14-2011, 11:10 PM Thread Starter
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ficm logic voltage at 3 volts!

I had a truck coming into the shop today running! but running rough. I checked the basics, and ficm main power about 12.5 volts and logic was at 3.25 volts. I couldnt believe it starts and runs. Its getting a ficm tomorrow.
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post #2 of 4 (permalink) Old 02-15-2011, 12:35 AM
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Was it a 7 post or a 4post?

03 Excursion, Banks turbo back, K&N intake, 285/70R17 on Eagle alloys, purchased June '10
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post #3 of 4 (permalink) Old 02-15-2011, 09:50 PM Thread Starter
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not sure what you mean on the # of posts, but this reading was a mistake with an otc genisys. The trucks date and vin were 07, but the motor emissions sticker was for 06. When the truck was entered as an 06, the readings were more normal for poor running, high 30s-low 40s volts. Oh well.
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post #4 of 4 (permalink) Old 02-15-2011, 11:43 PM
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sounds to me the ficm still needs to be replaced. I thought it had to be rock solid at 48 volts.

I was talking about the number of screws on the ficm board. The screws is were most of us here test the ficm voltage.

03 Excursion, Banks turbo back, K&N intake, 285/70R17 on Eagle alloys, purchased June '10
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