Question about 2000 Ford Taurus

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What does it mean to reset an inertia switch? Is it possible that would solve intermittent problems with my car appearing to lose electrical power and stalling? \r\n The symptoms were that for no apparent reason the hands on our gauges would stop working, the radio if it was on would stop working, the clock too, then a minute or two after that the car would stall. Sometimes it would be fine again in an hour or two, sometimes we put the car on the trickle charger.

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  • Ford Master
  • 6,826 Answers

The inertia switch will not have anything to do with this,have the alternator checked and the connections to the battery,that they are clean ,and tight,make sure the battery is good also.If this is at all helpful,please rate thank you.

Posted on Aug 21, 2010

Testimonial: "Appreciate the advice, will try that and let you know."

  • lhabkirk Aug 21, 2010

    I didn't give enough information. We took the car into the garage to do a "Battery and Charging
    checkup. They tested the battery, the alternator, the starter, the charging light, belts and tensioners. They said they could not recreate the problem, even on a long test drive, but when they first went to move my car into the garage it would not start and they had to reset the inertia switch. That is the reason I wondered if it could have resolved the problem.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Aug 21, 2010

    The inertia switch has to due with fuel cut off only,I would look at the cables,and the battery again,and be sure to check the battery connections.Have the alternator checked or check it your self,with a volt meter,put the volt meter on the battery and start the engine turn headlights on,and the ac on high blower setting,it should read 13.65 volts to 14.25 volts,anything less is not good.Check all connectors and grounds under the hood,it sounds more like a problem in these areas.The inertia switch will not be an off,and then on situation ether.If you are having to put the battery on a charger,then the alternator is not doing it1s job,it maybe a matter of catching it,but it should tell on itself,do the alternator check to see for yourself,then you will know,let me know how you come out,and rate please if this was at all helpful,thank you.

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I just put in a new fuel pump. i hve power at the interia switch but no power at ful pump what can be doing this


Typically the inertia switch is the last component interrupt before the fuel pump, meaning the signal thru the inertia switch goes straight to the pump without stopping anywhere else. NOW, when you say you have power at the inertia switch, do BOTH WIRES Have power(When priming or crankiing)? If only one has power and the other does not, the switch is either "Popped" and needs the button press reset, or the switch has FAILED. Period.
If BOTH wires have power when cranking, then you have a broken wire or disconnected plug between the inertia switch and the pump.

Jan 12, 2015 | 1998 Ford Econoline

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Where fuel box for fuel pump


? If you mean the Power Relay box, they are usually under the hood and there is a fuel pump relay. If you mean the "Inertia switch" which disconnects fuel pump power, it can be either behind the front kickpanels or behind a cover panel in the rear cargo area. If you have Air-ride, they like to put the Inertia switch close to it. There is a reset button on the Inertia switch.

Feb 05, 2014 | 2003 Ford Explorer

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1991 Ford F-350 7.5. Not getting power at the Inertia Switch from the Fuel pump relay, however the EEC and Fuel pump relay are both working. what could this be?


Have you been in any type of a wreck? If so the inertia switch is located in the circuit between the fuel pump relay and the electric fuel pump(s). If you have been in a significant impact the mechanism inside the switch will cause the switch to open the electrical circuit, shutting off power to the fuel pump as a safety precaution. The inertia switch is in the cab on drivers side, up against the firewall, to the left of the brake pedal or behind the right kick panel. I would suggest buying a new one because it is not something you can reset.

Dec 25, 2011 | 1991 Ford F350

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

1 Answer

The electric fuel pump isn,t coming on.is it the inertia switch


ford has a problem with the inertia switch check to mack sure the switch is reset u can thump it with a screw driver handle not real hard and that will trip it then push it in to reset it and while your doing things with the switch pull the conecter off and lool at if its burned or melted that will cause no power to go throu it i had the same problem with a ford ranger. if your sure that no fuses or relays are bad and that the switch is working properely then the pump is bad.

Dec 04, 2010 | 1989 Ford Mustang

1 Answer

How do you reset the inertia switch on a 1991 Ford Explorer (Eddie Bauer Edition)? The vehicle was involved in a front driver-side impact, it will crank but will not turn over. Someone mentioned possibly...


Its located on the passenger side floor boardpull the carpet back and its located on the right hand side of the floor its a module about 3 inches in length with a button on top of it depress the button and problem should be solved try disconnecting the battery first im sure you have done this by now good luck.

Nov 02, 2010 | 1991 Ford Explorer

1 Answer

I TRY TO DRIVE MY CAR GET S TO 3RD GEAR AND WONT GO TO 4TH, DIAGNOSTIC P1642?????


DTC P1642 is for a loss in CAN communication. You will need to read the codes from the other modules to see which one is the culprit. From your description is does sound like the CAN network went down. It may be a problem with the inertia switch. It may have partially tripped causing this problem.

See your owner manual for the location of your inertia fuel cutoff switch. It cuts off power to the fuel pump in an accident.

CAN is the communication network where all teh computers in your car talk to one another. There appears to be a problem intermittently here.

Sep 09, 2010 | 2003 Jaguar Xkr

1 Answer

Ran out of gas and wont start


Hi Terri. The Fords have a thing on them known as an 'inertia switch'. The switch is a safety, in the event of a crash, it will shut the flow of gas to the engine off so the car doesn't catch fire in the engine comp't. Also, the inertia switch is vacuum operated, meaning that it needs a constant supply of fuel going through or it will lose the ability to push, or allow fuel to get to the engine. Now, there is a reset for the switch located up under your dash board, probably on the drivers side, in toward the center console, or possible just to the right of the gas pedal. It looks like a black box with a step on it and should be labeled as such (it will say 'inertia reset' or something similiar on it). Just push the button and the switch is reset which will allow the vacuum to reset and allow gas to pass from the gastank to the engine. Good luck.

Jul 03, 2010 | 1994 Ford Ranger Supercab

2 Answers

Replaced fuel pump in 1998 for ranger


Diagnostic Trouble Code (DTC) P0232 indicates that the powertrain control module (PCM) detected the FPM circuit voltage was high when the fuel pump was commanded off. The FPM circuit is wired to a pull-up voltage inside the PCM. The FPM circuit will go high if, with the key on and the fuel pump commanded off, the FPM/FP PWR circuit loses its path to ground through the fuel pump. The FPM circuit will also be high if the FPM/FP PWR circuit is shorted to power.
Possible causes:
No Start:
Inertia fuel shutoff (IFS) switch not reset or electrically open.
Open circuit between the fuel pump and FPM circuit connection to the FP PWR circuit.
Poor fuel pump ground.
Fuel pump electrically open.
Diagnostic Trouble Code (DTC) P0102 indicates the MAF sensor signal went below 0.39 volt (refer to Voltage to Mass Air Flow Conversion Table at beginning of this Pinpoint Test) sometime during normal engine operation (Continuous) or during Key On Engine Running (KOER) Self-Test.
Did you have the MAF unplugged?

Feb 18, 2009 | 1998 Ford Ranger SuperCab

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