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02merc mountaineer stalled while driving ive checked relays fuses pcm dtr wiring and starter and solenoid will not crank or fire {pat} also, all check ok new bat every thing else functions

Not sure if ignition swith or tumblers the cause need help

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  • Cars & Trucks Master
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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 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.

Posted on Dec 19, 2016

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  • 2 more comments 
  • Jeff Armer Dec 19, 2016

    Sounds like you should take it to a qualified repair shop .

  • teddy graves
    teddy graves Dec 20, 2016

    found the issue had a blown fuse on an o2 sensor that also powered the pcm which in turn left the dtr ungrounded as the pcm grounds the dtr so communication from one to the other failed no power no spark stall the fuse was blown from the o2 sensor grounded on the exhaust causing a melted fitting and short repaired by an persistant okie in his yard in freezing weather never say die

  • Jeff Armer Dec 20, 2016

    Yea, that would do it for sure ! Hooking up a scan tool would have lead right there no communication with PCM , check power and grounds found the problem in two shakes of a lambs tail /

  • Jeff Armer Dec 20, 2016

    Instead of hunt an hope diagnostics



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Tyring to start my 2008 Super Duty. not cranking. Ive cleaned the cable ends still nothing.Ive not checked the voltage to the starter yet.

Try energising the starter solenoid manually with a jumper cable or similar. If the engine cranks the fault is ignition/starter switch, relay if there is one, fuse, wiring, connections or the immobiliser might not be disarming...

Apr 24, 2017 | Cars & Trucks

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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

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Awd merc 02 stalled in gear wont crank or fire starter pcm dtr and relays all ok transponder in keys ok ignition relay ok think ignition switch problem ? bench tested starter new bat no burned wires

Awd merc 02 ????? Mercury what ? Transmission range switch is input to the PCM . If the PCM thinks it's in gear I would look at this part . Read input data from range switch to PCM on a scan tool that can do that . Transceiver for Pats is around the ignition lock cylinder behind plastic cover ,

Dec 19, 2016 | Cars & Trucks

1 Answer

02 merc stalled checked relays fuses dtr pcm starter and patwill not engage starter keys trans ok also no burnt wires checked all but ignition switch need help

If you want help you need to explain a little better . When you turn the key to start , the starter doesn't engage , correct ? On top of the instrument pane is there a little red light flashing when you try starting the vehicle ? Need to know model so I can look at wiring diagram .

Dec 19, 2016 | Cars & Trucks

1 Answer

2002 mercury mountaineer stalled while in gear will not engage the starter coil pack all fuses relays dtr pcm starter pat ignition tumblers or ignition switch left to troubleshoot help please

Could you brake down your long paragraph ? Not sure what you have checked and what you need to check.

Please add more detail information as to your problem, what have you done as diagnosis, if any at all.

Dec 19, 2016 | 2002 Mercury Mountaineer

1 Answer

Ford F-150 2000 5.4L No Crank No Start

Ok it seems you isolated and checked the usual suspects and some that I wouldn't have looked at except one. Did you check the neutral safety switch and Alignment on your gears for the gearshift lever. If it is not aligned properly it may not be hitting the neutral safety switch when in neutral and park. Also if the switch has failed. It may not be allowing your system to start when you move the key to the start position. I'm also wondering if this model has a fusable link in the starter cable but you say that you've isolated and tested both the starter and the relay. So I would really suspect that neutral safety switch. Hope this helps.

Mar 23, 2014 | Ford F-150 Cars & Trucks

1 Answer

What typically is needed to to be done if a 2001 supercrew has had air bags deployed and wont start after that. The switch in the right kicker panel for the fuel pump does not appear to have been tripped....

Good info on the PATS / theft light. Looks to be the PATS / HEC operation is functioning correctly

The Fuel inertia switch only cuts power to the fuel pump, so if tripped, the truck would have a crank no start issue. Do you have a crank no start, or no crank issue.

To reset, just press down on it. To check if the switch is tripped, check for power at the connector to the fuel inertia switch

Engine compartment fuse # 10 ( 20A ) to the fuel pump relay -> Dark Green w/ yellow stripe wire to the fuel inertia switch -> pink w/ black stripe wire to the fuel pump module.
Check the pink w/ black stripe wire to ground with a meter for power, with the key in the run position.

If you turn the key from off to run ( do not start ) you should hear the fuel pump cycle ( hum, then turn off ).

Could be an issue with the fuel pump relay ( my '01 had a crank no start at ~ 35K miles, bad fuel pump relay ). I proved this out ( after a stupid ID10T error in my diagnoses process ) by jumpering the normally open contacts in the fuel pump relay socket, and then installing the trailer tow reverse circuit relay into the fuel pump relay socket ( same full size Ford Relay ).

Jumpering the fuel pump relay in the relay socket ( remove relay and use jumper wire ), red line

If you have a no crank issue, could be the DTR ( Digital Transmission Range ) sensor on the driver's side of the trans is out of alignment.

Check the start motor relay ( on the firewall on the passenger side ) for power on the Tan w/ Red stripe wire when the key is in the start position ( this is from the ignition switch through the DTR when in park or neutral to the starter motor relay ).

You can test another route, turn the key to the run position, and apply power to the Tan w/ Red stripe wire on the starter motor relay in the engine compartment on the firewall. BE CAREFUL, the motor should turn over, keep clear of moving parts.

Post back a comment to this problem with the results of the testing.


Nov 03, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

1500 Ram wont start, no crank no click nothing. Air cond and dash lights work just fine just wont start. Battery is ok tried to jump, no luck, put in different battery no luck.

First thing is to check is the ignition fuse/relay under the hood for a blown fuse or bad relay. If everything is ok then set parking brake with truck in park/netural and have someone to turn the ignition over to start and at the same time use a test light to check for fire at the starter solenoid. If no fire then the ignition switch or netural switch on transmission is causing the problem. If you do have power to the starter solenoid then the problem would be either the solenoid or the starter drive locked up on the flywheel. Be sure to remove the negative wire from the battery if you need to remove the starter. Hope this will help you.

Jun 02, 2010 | 2008 Dodge Ram 1500 2WD

1 Answer

Security lockout

If the theft light on the dash is blinking fast, that would be an indication of the PATS ( Passive AntiTheft System ) immobilizer not allowing the truck to start.

Turn the key from off to run ( do not start ), does the LED on the dash stop blinking ( takes ~4 seconds ) ?

If the LED goes out, and you turn the key and nothing happens, next to check is :
1. The Battery cables: Make sure the battery connections to the battery, and the starter are clean, and no damage.
2. The Starter solenoid fuse : This is fuse #101, 30A. This powers the normally open contacts on the starter relay.
3. The starter relay : This is in the fuse panel in the cab of the truck. If you want to try another relay, you can use the high beam relay or the trailer tow battery charge relay ( both Full size ISO relays ).

One other thing to try, turn the key to the run position ( do not start ) press and hold the brake, and shift into Neutral then turn the key to the start position. Could be the DTR ( Digital Transmission Range ) sensor it corroded in the park position, and not allowing power to come from the key to the starter relay.
If it starts, shift through the gear selector a few times, to see if this cleans the DTR contacts, put back in park shut off, and try to start again.
Here is the starting system diagram, so you can see what I am talking about

Jan 07, 2010 | 2005 Ford F-150

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