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2011 f350, 6.2 liter. Doesn't crank, gauge cluster doesn't

Customer Question
respond other than back lighting...
2011 f350, 6.2 liter. Doesn't crank, gauge cluster doesn't respond other than back lighting, ids can't communicate with pcm, radio and ac functions, jump start was attempted with a defective battery. Was towed in for a no start and put in my hands. No fuses were blown.
JA: Do all the fuses have the correct amperage for the circuits they're in?
Customer: Yes
JA: Are you fixing your F350 yourself? What have you tried so far?
Customer: Yes I am, checked for power and ground at the pcm, bcm, ignition switch, checked for resistance between bcm and ignition switch
JA: Anything else you want the mechanic to know before I connect you?
Customer: Number 31 5 amp fuse at bcm has no power.
Submitted: 1 year ago.Category: Ford
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Answered in 14 minutes by:
9/2/2016
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago
AMEDEE
AMEDEE, FORD TECHNICIAN
Category: Ford
Satisfied Customers: 27,110
Experience: ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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Hello and welcome! My name isCustomerand I would like to assist you with your question. Do all of the sensors that get a V ref with the key on have a FULL 5 volts going to them?

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Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

This would include the Yellow wire running from pin 9 of the C1381e PCM connector to the Throttle Position sensor, the Yellow/Green wire running from pin 52 of the PCM C1381b connector to the Air Conditioning Pressure sensor, and the Brown/Blue wire running from pin 66 of the PCM C1381b connector to the Fuel Tank Pressure sensor.

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Customer reply replied 1 year ago
No they dont
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

Check fuses 75, 76, and 78 in the engine compartment fuse box, and verify both sides of all three fuses show full battery voltage with the ignition on. How much voltage do these fuses have on them with ignition on?

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Customer reply replied 1 year ago
75 and 76 have relays for trailer stop lamps and back up lamps, 78 isn't used. Still have 11.9V
Customer reply replied 1 year ago
Headlights won't turn off so battery keeps getting drained.
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

Thank you for that information. I would check to be sure none of those V ref sensors are not shorted out as this can cause this problem. Start unplugging them one at a time and see if the 5 volts comes back. If not, then we need to go directly to the PCM and check the powers and grounds going into it with the key in the ON or RUN position.

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Customer reply replied 1 year ago
I have power and ground at all 3 pcm connectors.
Ford Mechanic: AMEDEE, FORD TECHNICIAN replied 1 year ago

Ok, then the PCM should be sending out the 5 volt reference with the key on. Which pins did you check for power and ground?

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AMEDEE
AMEDEE
AMEDEE, FORD TECHNICIAN
Category: Ford
Satisfied Customers: 27,110
27,110 Satisfied Customers
Experience: ASE CERTIFIED TECHNICIAN ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector

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