no signal to fuel injectors from pcm, replaced pcm and coils. - Ford Truck Enthusiasts Forums



1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

no signal to fuel injectors from pcm, replaced pcm and coils.

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Old 01-30-2010, 10:59 PM
976dave 976dave is offline
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no signal to fuel injectors from pcm, replaced pcm and coils.

1997 Ford Expedition, PCM was replaced, along with both coils. I inject fuel manually an it runs but I dont have any signal from PCM, Red leg to injectors is hot.
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Old 01-31-2010, 10:10 AM
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you need to check your pcm grounds to fire the injector the pcm gounds the circuit
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Old 01-31-2010, 11:38 AM
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What is your THEFT light doing at key-on?

Early PATS systems worked by disabling the injectors....
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Old 02-01-2010, 11:43 AM
976dave 976dave is offline
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I checked the PCM grounds and have no signal. The theft light continues to flash for an extended amount of time, longer than it used to, Do you think that it could be the key?
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Old 02-01-2010, 11:44 AM
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Gotta love Ron White!
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Old 02-01-2010, 11:47 AM
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that could definetly be the case
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Old 02-01-2010, 12:16 PM
976dave 976dave is offline
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Thank you for the quick response. Do I have to take the vehicle to the dealer or can I just take the key and reg?
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Old 02-01-2010, 01:37 PM
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you have to have the truck at the dealership, where are you at?
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Old 02-01-2010, 02:28 PM
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san jose ca. thanks for the good advise
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Old 02-01-2010, 02:37 PM
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oh little far for me to stop by with my computer
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Old 02-01-2010, 04:35 PM
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"You can't fix stupid!" ?????
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Old 02-01-2010, 06:14 PM
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"You can't fix stupid!" ?????
Hey, I'm cynical from having to work with people with more cents than sense (but not by much). It's not directed at anyone specific here (usually, although I might make exceptions).


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The theft light continues to flash for an extended amount of time
There's your problem. PATS is not proving out and the PCM thinks the truck is being stolen. Consequently, the PCM disables the engine.

Since you say you replaced the PCM, it's probably safe to say you did not follow the correct procedure in the workshop manual. Either reinstall the original PCM (if it is not defective) or tow it to a dealer for proper programming.
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