Question about 2004 Mercury Mountaineer

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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.

Mileage shows so doesn't appeAr PCM issue. Can it be PATS transceiver if I was able to manually reset keys&fobs by turning keys on off 8 times etc. Even though that worked, PATS went back to quick flashing and no start no crank.

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. 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 .

Posted on Dec 28, 2016


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Posted on Jan 02, 2017


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2013 mustang v6 premium bcm

You may be setting the code when you bypass the relay. If it sees voltage on that circuit when the ignition switch IS NOT in crank position, it will assume the circuit to be stuck high and can set that code.

In your enhanced datastream menu for either engine or PATS, does it show starter command engaged when you turn the key? There is a dataline for it in both sections. If it changes to YES but the car still wont crank unless you jump the relay, then the relay has failed or the wire(s) from the fusebox /PCM/FEM/park neutral switch may have a break in it. If the data pid DOES NOT change to START/ACTIVE, then the start signal is not being commanded, likely because the key turned to crank input is not reaching the BCM or ECM. You have a decent tool for the job, now start reviewing your datalines for key position, immobilizer/pats status, trans gear position, etc etc.

Jan 04, 2018 | Cars & Trucks

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2002 Ford Taurus will not start, I think it is the anti theft system. How do we reset that or by pass it?

If it was the PATS - anti-theft system you would not have any clicking at the starter . You have connection ,cable or starter problems , most likely . Testing the starter electrical circuit doing voltage drop testing .
Starter Voltage Drop
Do you know what a wiring diagram is ? Free wiring diagrams here Enter vehicle info. year , make , model and engine size . Under system click on engine then under subsystem click starting . Click the search buttom then the blue link. Looking at the wiring diagram I see fuse's at the top ,starter relay in the middle an at the bottom the starter , PCM - this is the engine computer . The PCM will energize the starter relay only if it receive's the correct coded message from the PATS module or which module is in charge of that . So you would not even get a click at the starter ,because the relay wouldn't even be energized . You could possibly have a transmission range sensor problem or positive battery cable to tthe starter or ground cable .
How to voltage drop test starter motor circuit
Test don't guess .

Oct 30, 2017 | Ford Cars & Trucks

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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.

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2004 mercury mountaineer wont turn over with good battery

do you hear any noises ???
start with a bad connection and then fuses/relay and then switch or starter
do the dash lights come on when you turn the key on ???
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Sep 07, 2014 | 2004 Mercury Mountaineer

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I have a 2004 Chevy trailblazer no start no crank but if I put key on hot wire the starter it will start I replace new ignition switch and new starter relay b

Before you do any thing check for loose or bad connections. Also check you ground connection to engine. Check Fuses, relay and for a Fusible Link open circuit. Now let me explain what a Fusible Link does. They are short lengths of small gauge wire installed between the Battery and the Ignition Switch, or the Battery and the Fuse Panel. They'll melt and open the circuit before damage occurs in the rest of the circuit. I hope this was helpful you.

Aug 09, 2014 | 2004 Chevrolet TrailBlazer

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2004 F-250, 5.4l gas. Won't start or even crank.

are you referring to the starter relay on the firewall? the voltage should drop to 0 when measuring across the signal path because the connection is made, essentially making it a piece of wire and there is no difference in potential between the two points. is there 12v to the starter motor? is the starter solenoid (located on the starter) receiving 12v? check fuses and fusible links. disconnect hot leads from the starter. remove the starter, and supply 12v directly to the motor. does the pinon gear extend and spin? starter.

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2000 ford windstar won't crank over,but pats keys good, and batt.

First thing I would check is to see if you have power at the trigger wire of the starter motor while someone is trying to start the vehicle for you. It will be a Yellow with a light blue trace. If you do then I would check to see if the main battery cable has power to it all the time when someone is trying to crank it. If it does then I would hold a test light on the case of the starter motor and have someone try to crank it. Make sure that the ground you use for this test is on the negative battery terminal not just anywhere on the car. If the test light lights while you are cranking it then you have a bad ground. Hook up a set of jumper cables from the battery negative terminal and clamp it directly on to your starter motor and see if it starts. If you check it and the test light doesn't light up and all the other checks are good then your starter motor has failed. If one of the other tests has failed then you have a starter relay problem or something else. let me know what you find out.

Apr 13, 2009 | 2002 Ford Windstar Cargo

1 Answer

Is there any way eliminate the anti-theft system on my 1999 windstar cause mine is malfunctioning and not allowing it to run (start). How many parts and connectors make up the system,anyways?

Anti-Theft —Passive 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
  • starter relay
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 customer literature such as the Owners Guide.
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 before it can be used to start the engine. There are special diagnostic procedures outlined in the manual that must be performed if the encoded ignition keys need to be replaced.
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 performs all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling the 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 communication 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 performed if either the instrument cluster or the PCM needs replacement.
All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working properly, 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.
PATS differs from perimeter anti-theft systems in that PATS enables and disables the engine from starting. If equipped, the perimeter anti-theft system protects the perimeter of the vehicle (doors, hood and trunk) and sounds an alarm.
PATS also disables the starter motor in addition to the PCM disabling the engine. When PATS disables the vehicle, it will neither crank nor start. If the instrument cluster is removed from the vehicle, the engine will not crank.
The starter relay is used as an additional means of disabling the vehicle engine. The starter relay is disabled when the PATS cannot read a valid encoded ignition key at ignition ON. The PATS will not store a diagnostic trouble code (DTC) or flash the theft indicator if a valid encoded ignition key is read but a fault occurs in the starter relay circuit.
The PATS is not compatible with after market remote start system, 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.

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4 Answers

Starter will not turn over

I had this problem and had my vehicle towed to two different places and was out a lot of money to find out it was the key. The security code had reset itself and the explorer acted as if it were being stolen therefore not allowing it to start. It has to be fixed by an authorized Ford Dealership. No one else has the ability to fix it. I hope this helps you not to have to pay two machenics for one problem. Thanks

Dec 15, 2008 | 2004 Ford Explorer

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