Need help - what did I do?
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Senior User
Joined: Aug 2005
Posts: 117
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From: Klamath Falls, Orygun
Need help - what did I do?
OK 'hope I didn't mess up's the parent's car. '01 Expedition actually, 5.4 Ltd 2WD. Dad has alzheimer's, shouldn't be driving but gives Mom the dickens about it when I'm not around. In order to disable the vehicle I unplugged three units on the driver's side firewall, large many wired plugs going to what I believe to be the computer. Plugged back in immediatley to test, started up fine. Three weeks later, I plug them back in, no start. Battery is about 12.6V. Key in 'on' position reveals airbag light. Alarm light on dash flashes. Everything else is dead. I do hope I didn't fry the computer somehow ... did this in a hurry while dad was asleep so he didn't pitch a fit.
Help please ...
Help please ...
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
I can't tell what you have but don't unplug the computer or any other parts.
Likely a plug is not seated or the Theft system has locked out.
All you need to do is look in the owner manual for the fuse that powers the fuel injectors and coils and remove it to stop the vehicle from running.
This fuse is in the engine bay right near the driver side fender.
.
I'm sorry to hear about you dad.
If he is driving, that presents a danger to anyone riding in the vehicle and others on the roadway.
An accident with a known medical condition can get very messy legally and with the insurance company.
Proper way is to have his doctor file for revoking his driver's license then it's off you and mom's shoulders if he at least knows his doctor did the action.
It's legal for a doctor to do this because of professional medical judgment.
It's better to take him where he thinks he wants to go than the risk of his driving.
Very best to you and everyone in your family and good you came to ask.
Likely a plug is not seated or the Theft system has locked out.
All you need to do is look in the owner manual for the fuse that powers the fuel injectors and coils and remove it to stop the vehicle from running.
This fuse is in the engine bay right near the driver side fender.
.
I'm sorry to hear about you dad.
If he is driving, that presents a danger to anyone riding in the vehicle and others on the roadway.
An accident with a known medical condition can get very messy legally and with the insurance company.
Proper way is to have his doctor file for revoking his driver's license then it's off you and mom's shoulders if he at least knows his doctor did the action.
It's legal for a doctor to do this because of professional medical judgment.
It's better to take him where he thinks he wants to go than the risk of his driving.
Very best to you and everyone in your family and good you came to ask.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
You might try removing the battery cable, disconnect the pcm connectors again and look at them with a light for possible bent pins and give them a quick spray with CRC's QD Electrical spray. Try to keep the spray away from the weather-pac seal so they don't swell and dry the connectors with air before reinstalling them. Then reinstall connectors and reconnect battery cable. As stated above pcm connectors shouldn't be removed constantly as the pins are now open to moisture corrosion from the environment.
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