Theft light flashing fast
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Freshman User
Joined: Oct 2009
Posts: 47
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Theft light flashing fast
I was stopped at a light and the truck shut off and wouldnt restart. i had to get it towed back to the house and i dont know what is wrong. i dont even hear the fuel pump turning on and my check engine and glowplugs lights wont go out. i just changed cps with no help. i tried plugging in my super chip tuner to read codes and it just said error!!!!!! HELP!!!!!
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Sounds like your EX thinks it's being stolen!
Use your other key to see if the theft system has just refused to recognize your currently-used transponder key, or if it's a general failure of the PATS, or even the entire Powertrain Control Module (PCM).
The Vehicle Security Module (VSM) has power coming in from a number of sources, so be sure to check fuse numbers 7, 17, 19, & 50. Also, check #34 and 44, as those power the anti-theft transciever module.
There are other things on those fuses, too, that may have gone defective to blow the fuse.
Take a look at the wiring diagrams here:
http://www.e-toolbox.com/ads/wiring/va152780.pdf
and here:
http://www.e-toolbox.com/ads/wiring/va152782.pdf
and here:
http://www.e-toolbox.com/ads/wiring/va152784.pdf
Pop
Use your other key to see if the theft system has just refused to recognize your currently-used transponder key, or if it's a general failure of the PATS, or even the entire Powertrain Control Module (PCM).
The Vehicle Security Module (VSM) has power coming in from a number of sources, so be sure to check fuse numbers 7, 17, 19, & 50. Also, check #34 and 44, as those power the anti-theft transciever module.
There are other things on those fuses, too, that may have gone defective to blow the fuse.
Take a look at the wiring diagrams here:
http://www.e-toolbox.com/ads/wiring/va152780.pdf
and here:
http://www.e-toolbox.com/ads/wiring/va152782.pdf
and here:
http://www.e-toolbox.com/ads/wiring/va152784.pdf
Pop
Gone Fishin for Mark
Joined: Nov 2004
Posts: 1,354
Likes: 2
From: West of Houston
Check, clean and charge the batteries. Even relatively low voltage will do screwy things to these systems.
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Postmaster
Joined: Jan 2009
Posts: 2,544
Likes: 4
From: Suffolk, VA
It most certainly will. Also clean the battery and cable terminals. I had the same thing happen to me when my batteries were weak. Seemed like they were ok, but truck wouldn't start and had all that weird stuff you described happen. Mine was a bad alternator (I didn't notice) and after driving it around for a while obviously the batteries were drained.
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Thread Starter
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Freshman User
Joined: Oct 2009
Posts: 47
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i will try the batteries, but the truck still wants to crank but doesnt and i dont even hear the after market fuel pump turn on either. would bad batteries kill the truck like that at an idle? thanx again for all your help this forum is a God send!!!!!
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
If nothing is re-charging the batteries (a bad alternator perhaps), once the battery voltage drops below 10.5 volts, the engine stops running.
It will run at 10.6, but at 10.4 it's dead. Yes, an insignificant change, but that's the threshold for failure.
The engine is not like an old gasser, which may run until the lights are nothing but a dull red.
Pop
It will run at 10.6, but at 10.4 it's dead. Yes, an insignificant change, but that's the threshold for failure.
The engine is not like an old gasser, which may run until the lights are nothing but a dull red.
Pop
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
I was stopped at a light and the truck shut off and wouldnt restart. i had to get it towed back to the house and i dont know what is wrong. i dont even hear the fuel pump turning on and my check engine and glowplugs lights wont go out. i just changed cps with no help. i tried plugging in my super chip tuner to read codes and it just said error!!!!!! HELP!!!!!
A whole new meaning to Drive it like you stole it...sorry, thats all I got, not much help on this one. I would have pointed to a loose connection on a battery as well.
Thread Starter
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Freshman User
Joined: Oct 2009
Posts: 47
Likes: 0
i replaced the batteries and still no luck, i check the voltage at the alternator and it was perfect, i guess it is pointing to the pcm or the vsm. i am left with no other option but to go to the stealership. to get the pcm replaced is 375 that includes the keys being reprogrammed. that is still a guess at the problem. i want to push this truck deeeeeeeeep in the ocean!!!!!!!
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Are you sure you have an after market fuel pump? What pump do you have? You should hear the fuel pump come on when you turn the key on. Is the pump under the drivers side seat on the frame rail?