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Tim, Ford Technician
Category: Ford
Satisfied Customers: 1044
Experience:  23 years Dealership experience, Ford Senior Master Technician since 2000, ASE Master since 1985
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2000 Ford F150: 4x4, 5.4L 50K miles..pickup..keys

Resolved Question:

I have a 2000 Ford F150, 4x4, 5.4L 50K miles. I replaced the computer(YL3F12A650KC) with a used computer. The pickup has two keys. After installing the used computer the engine would turn over but the pickup would not start. The analyzer pulled two DTC's, P1000 and P1260. I suspect the problem is anti-theft. Can the problem of getting the pickup started be solved without going to the dealership or using an analyzer?
Submitted: 8 years ago.
Category: Ford
Customer: replied 8 years ago.

2000 Ford F150 4x4 5.4L

Already Tried:
Inserted one key to KOEO, waited 5 seconds and removed key. Inserted second key to KOEO, waited 5 seconds and rmoved key. Inserted first key to start...engine turned over but would not start.
Doug Garrett
Expert:  Tim replied 8 years ago.


When replacing the PCM you have to do a parameter reset procedure in order for the cluster to recognize the PCM. This is a security feature of the passive anti-theft system. You will have to take it to a dealer or another shop that is capable of doing this type of programming. I hope this helps, if so please accept this answer. If you need additional help, just reply back to this answer and I will be happy to assist. I am including a description of how the anti-theft system works below.







The passive anti-theft system (PATS) contains the following components:

  • theft indicator
  • encoded ignition key
  • transceiver module
  • instrument cluster
  • powertrain control module (PCM)
  • standard corporate protocol (SCP) communication network

The PATS uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user. This system is known as SecuriLock® in North America, Safeguard® in the U.K. and PATS in continental Europe. This information can be found in owners literature.

The PATS uses a specially encoded ignition key. Each encoded ignition key contains a permanently installed electronic device called a transponder. Each transponder contains a unique electronic identification code, with over 72 million billion combinations.

Each encoded ignition key must be programmed into the vehicle's instrument cluster (the instrument cluster is also known as a hybrid electronic cluster [HEC]), before it can be used to start the engine. There are special diagnostic procedures outlined in the workshop manual that must be carried out if new encoded ignition keys are to be installed.

The encoded key is larger than a traditional ignition key. The key does not require batteries and should last the life of the vehicle.

The transceiver module communicates with the encoded ignition key. This module is located behind the steering column shroud and contains an antenna connected to a small electronics module. During each vehicle start sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the instrument cluster.

The control functions are contained in the instrument cluster. This module carries out all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The instrument cluster initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.

The PATS uses the PCM to enable or disable the engine. The instrument cluster communicates with the PCM over the SCP network in order to enable engine operation. The instrument cluster and the PCM use sophisticated messages in order to prevent a theft. The instrument cluster and the PCM share security data (when first installed together) that makes them a matched pair. After this security data sharing, these modules will not function in other vehicles. The shared PCM ID is remembered even if the battery is disconnected. The instrument cluster also stores the vehicle's key identification code even if the battery is disconnected. There are special diagnostic procedures outlined in this workshop manual that may be carried out if either a new instrument cluster or PCM needs to be installed.

All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start.

PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator will either flash rapidly or glow steadily (for more than three seconds) when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.

The PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be started from outside the vehicle. These systems may reduce the vehicle security level, and also may cause no-start issues. Remote start systems must be removed before investigation of PATS-related no-start issues.

Customer: replied 8 years ago.
Can the parameter reset procedure be completed with a PT2500 ANALYZER(I have access to one.) If so, what is the exact sequence to follow on the analyzer.
Expert:  Tim replied 8 years ago.


I do not believe this procedure is available on most scanners. The only option I am aware of is the dealer. You could try the scanner though. If the option is available it would be in the cluster test most likely. It is simply called "parameter reset" Basically the scanner just does it for you when you select it. This mates the PCM to the cluster for the Pats system. It should not cost more than $100 to have this done at a dealer.




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