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Having an intermittent issue where my 2002 f350 will turn…

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Having an intermittent issue...

Having an intermittent issue where my 2002 f350 will turn over but wont start. Had to buy a refurbished PCM. Old one died. The only code is P0603 for low KAM voltage. Batteries are new. When I replaced the PCM it worked fine for 6 starts then nothing. Waited until the next day and tried it again and it started. Did fine for another 19 starts then a no go. Tried starting it about 6 times and then it fired again. 2 more starts, then nothing again. I believe it has something to do with the wiring harness power pins that feed the PCM. ICP sensor is new, cam position sensor is new.

Mechanic's Assistant: Lots of things can cause problems with the battery. The Ford Mechanic will know what to do. Are you hoping to fix this yourself?

As I said, the batteries are new and if I can fix it myself I will. I just want a reliable truck. If I need to take it somewhere I will....assuming it will start one more time.

Mechanic's Assistant: Is there anything else important you think the Ford Mechanic should know about your Ford?

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Submitted: 2 years ago.Category: Ford
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Answered in 5 minutes by:
2/17/2016
Ford Mechanic: Ron, ASE Certified Technician replied 2 years ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 38,839
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Verified

Hello and thank you for your question,

The fault code P0603 is in most cases cause by a failing PCM providing you have power and ground to it. I have enclosed the steps to check this in the link below. Copy and paste the link to your browser to open and view it. If your power and grounds check okay then the new PCM is very likely defective.

https://dl.dropboxusercontent.com/u/104923897/P0603%20Feb%2017.pdf

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Customer reply replied 2 years ago
link did not work
Ford Mechanic: Ron, ASE Certified Technician replied 2 years ago

In order to open and view it you need to copy and paste it into your browser. Try it again. Looks okay from this end.

https://dl.dropboxusercontent.com/u/104923897/P0603%20Feb%2017.pdf

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