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Dan
Dan, Technician
Category: Ford
Satisfied Customers: 24408
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have 2003 Ford F350 7.3 Code P1271 Runs good I replaced

Customer Question

Hi good morning
I have 2003 Ford F350 7.3
Code P1271 Runs good
I replaced Injector, valve cover gasket, Idm Still Check engine light is on Any idea?
Submitted: 2 years ago.
Category: Ford
Expert:  Dan replied 2 years ago.

Hello, my name is***** code sets when PCM detected an open condition on the High to Low side of the Injector 1 control circuit. So this pretty much means injector, wiring, or PCM.
Next step is checking resistance of injector circuit between injector and injection control module, if good replace PCM. If low run new wire and clean/repair connectors. Here is information from manual on how to test with diagrams. Let me know if you have more questions. Thanks.
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https://www.dropbox.com/s/5lek2juuru2n5rj/fj2.pdf?dl=0
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https://www.dropbox.com/s/udhgb7tncy23t3x/p1271a.pdf?dl=0
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https://www.dropbox.com/s/twlc2am07vmopi6/1271.PNG?dl=0
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