Question about 2004 Ford Explorer

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Engine will not crank, dash bd lights come on,

Engine will not crank, dash bd lights come on, fuses are ok tried installing new pats transceiver and new battery, no change alternator and relay switch make two fast clicks and thats all when turned to run Was hoping to get the procedures for programing the keys if they are decoded.

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Hi, diagnosing a no-start condition requires a logical approach to figuring out what might be preventing your car from starting. First, if the engine won't even crank over when you turn the ignition to START, your car obviously won't start. When you turn the ignition key to start your car, voltage from the battery flows through the ignition switch to the Park/Neutral safety switch and/or brake pedal or clutch pedal safety switch (you have to push the pedal down before the circuit will complete) to the starter relay or solenoid. When the relay or solenoid is energized by voltage from the ignition switch circuit, it closes a contact that routes more power from the battery directly to the starter to crank the engine. The starter motor spins, pushes the starter drive gear to engage the flywheel and cranks the engine.

If the engine fails to crank, there is a fault in one of the components in the battery/ignition/starter circuit. You have to troubleshoot by checking below..

  1. Low battery (Check battery voltage, recharge if low, or jump start with another vehicle or battery charger).
  2. Loose or corroded battery cables (Inspect, clean and tighten BOTH ends of BOTH battery cables).
  3. Bad starter relay wiring connections or ground connection (Inspect, clean, tighten wiring connections).
  4. Bad starter relay/solenoid (Check for voltage at relay, if relay has voltage but there is no "click" when key is turned to start, replace relay).
  5. Bad starter (Jump battery voltage direct to starter to see if it spins, or remove starter and have it bench tested at auto parts store).
  6. Damaged starter drive or teeth on flywheel (Remove starter and inspect drive gear and flywheel teeth, replace damaged parts if necessary).
  7. Bad ignition switch (Check to see if voltage reaches starter relay/solenoid when turn to start. If not, check for open P/N switch and brake or clutch pedal switch. Replace ignition switch if defective).
  8. Open P/N safety switch, or open Brake Pedal Safety Switch (automatic transmission) or open Clutch Pedal Switch (manual transmission). Bypass switch with jumper wire to see if engine cranks, or use test light or voltmeter to check for voltage passing through switch when ignition is turned to start.
  9. Engine seized due to bearing failure or internal damage (Use socket and long handle to see if engine can be turned by hand, if not engine is locked up).
  10. Engine hydrolocked due to coolant leak from leaky head gasket (Use socket and wrench to see if engine rotates, remove spark plugs and see if coolant comes out or engine can not be cranked with plugs out).


Programing a car key isn't something that just anyone can do. That's why replacement car keys can be expensive. When you buy replacements keys from the dealership, you are not just paying for the cut car key, but for the programming of the small electronic chip inside of the key.
The dealership programs the chip with a special tool. Some car keys can be programmed with very simple steps while others need special diagnostic equipment to be connected to the car's computer.

Posted on Dec 30, 2010

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2004 Mountaineer no start no crank? Battery, starter, fuses, relays all good. No code errors. PATS problem. Original keys&fobs all good even reset manually and good. All dash lights functions ok.


. quick flashing when ? when trying to start the vehicle ? If yes you need to have it checked for codes . Do you know what DTC'S - diagnostic trouble codes are . If that light is flashing while trying to start the vehicle codes are present in the module that controls PATS . Instead of guessing have towed to a qualified repair shop . Because you have no idea how to diagnose this system .

Dec 28, 2016 | 2004 Mercury Mountaineer

1 Answer

Why doesn't my engine turn overwhen i turn the switch and try to start it?


Is there a red light flashing on top of the dash when you try to start the vehicle ? PATS - passive anti- theft system will not let the starter engage .No - crank - no start

Oct 06, 2016 | 2002 Ford Explorer

1 Answer

Vehicle will not start! Replaced the battery but it will still not turn over. Oil light, battery and engine light come on when initially trying to start.


Is the security light on or flashing when trying to start the vehicle .
Anti-Theft The passive anti-theft system (PATS) consists of the following components:
  • Anti-theft indicator
  • Encoded ignition key(s) (the key contains a transponder)
  • PATS transceiver
  • Powertrain control module (PCM)
PATS will disable the vehicle from starting if there is:
  • a damaged PATS key.
  • an unprogrammed PATS key.
  • a non-encoded key (a conventional key or one that does not have any electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged PCM.
If it is a anti-theft system you will have to take it to the dealer .This system will keep the starter from spinning the engine .

Oct 30, 2015 | 2007 Ford Freestyle

1 Answer

My car thinks it is being stolen 2008 Ford Fusion anti theft has disabled ignition. Tried disconnecting the battery; remote entry with ikt; using key to unlock; hit panic button and turned it off with...


Hi Eileen , How do you know your having a anti-theft system problem ? Any lights flashing when you try to crank the vehicle ? The engine does not crank over ? If it is a anti-theft system problem ,disconnecting the battery is not going to do anything except lose some learned setting's in some control modules . There are a few thing's you can check but if none of these are the problem your going to have to have it towed to the dealer ! It'll need to be checked for DTC'S - diagnostic trouble codes !
PATS disables the vehicle from starting if there is:
  • a damaged PATS key.
  • a non-programmed PATS key.
  • a non-PATS key (key has no electronics).
  • damaged wiring.
  • a damaged transceiver.
  • a damaged instrument cluster.
Inspection and Verification
  1. Verify the customer concern.
  1. Visually inspect the following for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Large metallic objects, a second passive anti-theft system (PATS) key on the same key ring as the PATS key, or electronic devices on the key ring that can be used to purchase gasoline or similar items
  • Ignition lock cylinder
  • PATS key
  • Use of a non-PATS key or incorrect PATS key
  • More than one PATS key on key ring
  • Remote start system installed
  • Smart junction box (SJB) fuse(s):
    • 13 (7.5A)
    • 23 (7.5A)
    • 26 (7.5A)
  • Circuitry
  • PATS transceiver
  • Ignition switch
  • Instrument cluster
You may not know where some of these things are located !

Mar 22, 2015 | 2008 Ford Fusion

3 Answers

What does it mean when the ford PATS light is not flashing?


Try turning engine over with the head lights on, do the head or dash lights dim? Check earth straps, eg. battery to chassis, engine block to chassis, battery to engine block, (may not have battery to engine block), then check starter solenoid/relay and motor, then Check all power fuses, and fuse relays.

Oct 16, 2014 | 2003 Ford Focus

2 Answers

Remote Start Ford Exp 2003


try another key, if you install another key with ignition in the on position for 3 seconds warning light off, then turn off ignition switch, then start engine.if engine still dont start and the pats warning light keep flashing and dont turn off in 3 seconds.you need have vechicle pats system scan at dealership, you need diagnostic equipment to trouble shoot the PATS SYSTEMS.many things will cause you problems like fault to ecm to the immobilizer control module,could have worn transponder on key or faulty read coil in the ignition switch lock cylinder.

Aug 25, 2012 | Ford Explorer Cars & Trucks

1 Answer

MY 1999 FORD EXPEDITION SHUT DOWN,I THINK IT IS MY ANTI THEFT, HOW DO I CUT IT OFF AND WHERE IS IT ON THE SUV?


The anti theft light will flash fast on the dash if it's activated. You simply lock & unlock the doors to disarm it.

Check your inertia switch to see if it is activated. Press the rest button. Se owner manual to rest.

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.
Visual Inspection Chart Mechanical Electrical
  • Ignition lock cylinder
  • Encoded ignition key (PATS key)
  • Use of non-encoded ignition key (key without the molded plastic head, non-PATS key)
  • Use of a non-programmed encoded ignition key
  • Central junction box (CJB) Fuses:
    • Fuse 2 (5A)
    • Fuse 6 (5A)
    • Fuse 30 (30A)
  • PATS transceiver
  • Connectors
  • Ignition switch

Oct 25, 2011 | 1999 Ford Expedition

1 Answer

I HAVE REPLACED THE PCM COMPUTER, ACTUALLY, I SENT MINE IN FOR REPAIR. THEY "FLASHED" IT, I PROVIDED VIN, AND ALL OTHER INFO REQUESTED. I REINSTALLED IT, CALLED LOCKSMITH TO "MATE" THE KEY AFTER IT...


SECTION 419-01: Anti-Theft — PATS 2000 F-150 Workshop Manual
DESCRIPTION AND OPERATION Anti-Theft —PATS 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.


-------------------------------------------------------------------------------------------------------
Visual Inspection Chart Mechanical Electrical
  • Ignition lock cylinder
  • Encoded ignition key (PATS key)
  • Use of non-encoded ignition key (key without the molded plastic head, non-PAT key)
  • Use of a non-programmed encoded ignition key
  • Central junction box:
    • Fuse 2 (5A)
    • Fuse 6 (5A)
    • Fuse 30 (30A)
  • PATS transceiver
  • Connectors
  • Ignition switch

Mar 11, 2010 | Ford F-150 Cars & Trucks

1 Answer

2001 Ford Windstar, won't start, theft light on, van has a new battery


theft light should be flashing when system is armed. It should reset itself. If on steady, you have a probelem. Try your other key first. This inof should help you. Report back if you still need help.

Anti-Theft —Passive The passive anti-theft system (PATS) contains the following components:
  • theft indicator
  • encoded ignition key
  • PATS transceiver module
  • powertrain control module (PCM)
  • standard corporate protocol (SCP) communication network
--------------------------------------------------------------------------------
Principles of Operation
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 out of over 18 billion, billion combinations.
The passive anti-theft system (PATS), also known as SecuriLock ®, uses radio frequency identification technology to deter a driveaway theft. This system is known as Securilock® in North America, Safeguard® in the U.K., and PATS in Continental Europe. Passive means that it does not require any activity from the user.
The SecuriLock® System (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. If equipped the remote start system must be removed before investigation of PATS-related, no-start issues.
Each encoded ignition key must be programmed into the vehicle's powertrain electronic control (PCM) before it can be used to start the engine. There are special diagnostic repair procedures described in this section that must be carried out if a new encoded ignition key is necessary.
This system contains a new feature named Unlimited Key Mode. This feature allows a customer to program more than eight keys to the vehicle if they request it. Each vehicle in Unlimited Key Mode is set up with a special Unlimited Transponder Security Key. This allows all the customer vehicles to share the same keys, but no other keys from outside can be used to operate the vehicles. For an individual customer, any randomly selected Security Key is acceptable. Refer to Unlimited Key Mode Programming in Key Programming Switch State Control in this section.
The PATS transceiver module communicates with the encoded ignition key. The 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 data to the PCM.
The control functions are contained in the PCM. This module carries out all of the PATS functions, such as receiving the identification code from the encoded ignition key and controlling the engine enable. The PCM initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
All elements of the 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.
The PATS uses a visual theft indicator. The 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 concern, this indicator will either flash rapidly or glow steadily when the ignition switch is turned to RUN or START. The PATS system also flashes the theft indicator every two seconds at ignition OFF to act as a visual deterrent.
The following will activate the PATS and will disable the vehicle from starting:
  • incorrectly encoded ignition key
  • damaged encoded ignition key
  • unprogrammed key
  • non-encoded key (key has no electronics)
  • damaged wiring
  • damaged transceiver
  • damaged PCM
Inspection and Verification
  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Large metallic objects, a second ignition key on the same key ring as the PATS ignition key or electronic devices on the key chain that can be use to purchase gasoline or similar items
  • Ignition lock cylinder
  • PATS key
  • Use of a non-PATS key
  • More than one PATS key on key chain
  • Central junction box (CJB) fuse 16 (15A)
  • Battery junction box (BJB) fuse 20 (15A)
  • PATS transceiver module
  • Ignition switch
  • Loose or corroded connection(s)

May 27, 2009 | 2001 Ford Windstar

1 Answer

My 2005 f150 wont star my anti theft system is


alarm rearms itself.

this is for 2001 and is similar.

Anti-Theft —PATS 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.

------------------------------------
Visual Inspection Chart Mechanical Electrical
  • Ignition lock cylinder
  • Encoded ignition key (PATS key)
  • Use of non-encoded ignition key (key without the molded plastic head, non-PAT key)
  • Use of a non-programmed encoded ignition key
  • Central junction box:
    • Fuse 2 (5A)
    • Fuse 6 (5A)
    • Fuse 30 (30A)
  • PATS transceiver
  • Connectors
  • Ignition switch

May 11, 2009 | 2005 Ford F-150

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