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Ask Ray M. Your Own Question
Ray M.
Ray M., Ford Master Tech
Category: Ford
Satisfied Customers: 3019
Experience:  30+ years in trade, Ford Master Tech, Journeyman Automotive Tech
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Will my f350 crank if the pcm power diode is bad, it is a

Customer Question

will my f350 crank if the pcm power diode is bad
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: it is a auto dually
JA: What is the model/year of your Ford?
Customer: 1996
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: checked all fuses and changed relays... we wanna know if the power diode will cause truck not to crank
JA: Anything else you think the mechanic should know?
Customer: thats all want crank
Submitted: 4 months ago.
Category: Ford
Expert:  Ray M. replied 4 months ago.

Yes it will still crank it just wont fire and run.

Customer: replied 4 months ago.
Any way to use a jumper wire in place if the pcm power diode
Expert:  Ray M. replied 4 months ago.

I would not recommend it, as sensitive circuits in the PCM could be damaged.

Customer: replied 4 months ago.
Ok the wait to crank light comes on and goes off when time check engine light is not on getting fuel in fuel filter but still want crank. What could it be
Expert:  Ray M. replied 4 months ago.

It could be a number of things, but experience tells me it is most likely either the bad Pcm diode or it could be a faulty camshaft sensor or as simple as a bad glowplug relay. Is there any smoke from the exhaust when you are cranking it over?

Expert:  Ray M. replied 4 months ago.

I will be away for the rest of the day, but will be back online around 7:00 pm.