Question about 1998 Ford Expedition

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My 1998 ford expedition won t start and the theft

My 1998 ford expedition wont start and the theft light is blinking. also my key had been damged for a year. does that have somthing to do with it too ?

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  • Mark Ohl Jul 24, 2013

    This might work for pats system 2 or "B" but not system 1 or "A" I'm still looking for that fix

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  • Ford Master
  • 4,369 Answers

The light blinks when the system is armed. Normal.

Your key has to be able to communicate with the receiver in the ignition area. Does your other key work ok?

Anti-Theft The passive anti-theft system (PATS) uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user.

  • During each vehicle start sequence, the ignition key identification code is requested by the PATS module.
  • If the key's ID code has been programmed into the system, the vehicle powertrain control module (PCM) (12A650) is allowed to operate; this allows the vehicle to start.
  • If the key's ID code is not programmed into the PATS module, or if no encoded key is detected, then the vehicle PCM is disabled.
The PATS module, located under the driver side instrument panel, communicates the state of the security system to the PCM via the module communications network. The PCM, based on the communications from the PATS module, will determine if the vehicle's engine will be enabled to start. If the PCM prevents the vehicle from starting because of PATS, the PCM will store a DTC in memory.
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The anti-theft vehicle protection system utilizes the THEFT indicator, located in the instrument cluster (10849), when the ignition switch is turned to the RUN/START position. The indicator provides system prove out and operating status to the customer or technician.
Each PATS ignition key holds electronics that give each key a unique ID code.
The PATS will activate the indicator signal when the ignition switch is turned to the RUN/START position. The THEFT indicator will turn ON for two seconds, then turn OFF.
If the THEFT indicator flashes for one minute or more, this indicates that there was no key code received.
When the vehicle ignition switch is placed in either RUN or START, the PATS module requests the ignition key ID code. The PATS module requests the ignition key ID code by supplying power, ground, and the carrier signal to the transceiver to energize the ignition key. After the energize period, the key transmits its ID code to the transceiver module, which sends it to the PATS module.
The PATS module then compares the received KEY ID code to those stored in memory (16 maximum). If the ID matches, the PATS module sends an enable signal to the PCM over the module communication network.
The passive vehicle protection system utilizes the engine management capabilities of the PCM to enable or disable the vehicle engine. The module communication network is used to send and receive messages to and from the PCM.
Within one second after engine start, the PCM must receive an enable signal from the PATS module through the module communication network or the engine is disabled before the vehicle can be moved.
If the PATS module recognizes a stored ignition key code but there is a module communication network concern preventing the PCM from recognizing the start enable signal from the PATS module, the vehicle engine will be disabled. If this happens, the PATS module will flash the THEFT indicator for one minute, then flash diagnostic trouble code 16 ten times to indicate there is a problem with the module communication network circuits or the PCM is not responding properly.
The passive vehicle protection system will disable the vehicle from starting if there is a:
  • Damaged encoded key.
  • Unprogrammed key.
  • Non-encoded key (key has no electronics).
  • Wiring concern.
  • Transceiver concern.
  • Control module concern.
  • Module communications network concern.
  • ----------------------------------------------------------
Key Programming —Spare Key NOTE: Before starting this procedure, make sure the key(s) you want to program have the correct mechanical cut.
NOTE: Performing this procedure does not erase existing programmed keys.
  1. Insert the programmed key in the ignition. Turn to RUN.
  1. THEFT indicator proves out after two seconds.
  1. Remove the programmed key.
  1. Within 15 seconds, insert the new key in the ignition and turn to RUN.
  1. THEFT indicator proves out after two seconds.
  1. The extra key is now programmed.
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Key Programming —New Key (Without Diagnostic Tool) NOTE: Before starting this procedure, make sure the key(s) you want to program have the correct mechanical cut.
  1. Insert the nonprogrammed key in the ignition and turn to RUN.
  1. THEFT indicator flashes rapidly.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. Within five minutes after the THEFT indicator has stopped flashing, turn the ignition key to OFF and back to RUN.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. Within five minutes after the THEFT indicator has stopped flashing, turn the ignition key to OFF and back to RUN.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. All originally programmed keys are now erased, and only the key in the ignition is programmed.
  1. Additional keys may be programmed; refer to Key Programming—Spare Key .
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Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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SOURCE: 1998 ford expedition that won't start. it cranks,

The theft light blinking indicates a PATS (perimeter anti-theft concern.It means that the computer has not recieved a signal from your key when trying to start the vehicle. A few things could be wrong.
1...The key you are using to start the vehicle is not programmed to the vehicle or broken internally. So try a different key(one that you know is programmed to the vehicle) if you have more than 1. If the theft light goes on and flashes when you try to start the vehicle, you must wait about 5 minutes before trying the second key because the computer goes into antiscan or theft mode and wont let any keys start the vehicle.
2... There is a small transciever ring located arount the key cylinder which recieves the key signal. The wiring for the tranciever runs down the steering column into the dashboard wiring. Sometimes these wires break. If you have a tilt steering wheel, move it all the way down and try to start, then try moving it all the way up and try to start. Keep in mind the antiscan that I mentioned in #1. If this works then you need to check the wiring at the base of the steering column. A white connector with 4 wires. Pull on each wire to see if any are broken.
3... Check fuse #30 on interior fuse panel. If it is blown then you will have to trace down the cause of the short. The ignition coils are on this fuse also so one could be shorted. Disconnect all ignition coils(you may have 8 located on each plug if 5.4l engine or 2 located on l+r front of engine if 4.6l engine) and see if the short is gone. If the short is still present disconnect the radio noise supression capacitors( small black box approx 1" x 1" square with a single wire coming out) that are located on the left and right front of the engine. Pay close attention to all the wiring around the coils, look for any areas that may have rubbed thru and shorted.
These are things that I would look for first and are the most likely causes. This should get you started in the right direction. Be patient and post your findings if you fix it or not.
Good luck

Posted on Apr 10, 2010

  • 625 Answers

SOURCE: anti theft device for 97 ford expedition

you need to call a lock smith guy most of they have the machine to do it. or call arrown to se what shop has a ford scan tool
it has to be a scan tool only to do fords.

Posted on May 28, 2008

  • 5516 Answers

SOURCE: theft light blinking/car won!t start

If you have key numbers on the door, you should enter the code, then immediately start the truck. If this does not work contact the dealer for a sequence to reset the alarm.

Posted on Jun 28, 2009

  • 708 Answers

SOURCE: 1998 ford expedition wont start. theft like is

If you are reseting a factory alarm...lock and unlock the drivers door with the key. If you don't know the code look under the dash driver side in left corner there should be a black cover with a sticker with a code on it 6 numbers that is the factory code.

Posted on Oct 07, 2009

  • 1 Answer

SOURCE: 1998 ford expedition blinking overdrive light

This blinking light indicates a problem. You will have to have it scanned for trouble codes to find out
what it is.

Posted on Mar 29, 2009

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1 Answer

How to bypass factory anti theft on 1998 ford expedition


Attention to everyone with this problem. The alarm light will always blink when vehicle is not in operation but blinks slow. This is normal. You only have a problem if you cannot start vehicle. This is a sign there was a "attempted" theft of your vehicle. If this is the case, you will usually have to do like others have suggested. A new key and or fob, etc. Hope this helps. I went through this embarrassment when I "drove" my 2000 Explorer to the dealership and was informed of the same thing I just explained. Seems reading the owners manual sometimes will answer some of the most seemingly complicated questions:)

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Your key may be worn to a point that the anti-theft doesn't recognize it as the original key. If you have another key try it. Either a good locksmith or the dealer should be able to provide you with a new key. Good luck and I hope that helps..

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You can't will have to be repaired, check and see if the chip on top of the key did not fall out, if not more then likely chip is damage, most mobile lock smith have the computer to reprogram a new chip to your theft system, being you have the key won't be that much, between $60.00 - $100.00.

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If you are reseting a factory alarm...lock and unlock the drivers door with the key. If you don't know the code look under the dash driver side in left corner there should be a black cover with a sticker with a code on it 6 numbers that is the factory code.

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