Question about Pontiac Cars & Trucks
I have a 99 Pontiac Grand Am I was driving and it just turned off and it won't start the radio don't come on Turn singles don't work electric door locks don't work. I checked all fuses I changed the relay to the fuel pump. It started and then it stopped. I'm having the same problem, it won't start. Don't know what to do
Check the connections to your battery. Wiggle the cables and see if it doesn't fix your problem.
Posted on Oct 19, 2013
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Posted on Jan 02, 2017
SOURCE: 2000 Jeep Grand cherokee Laredo
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
Posted on Sep 27, 2009
Well i would change the fuel filter first. Then if that doesn't fix it there might be a reset button on the inside of the trunk for the fuel pump actually look for the reset button first. If you don't have one there is a relay switch under the hood sometimes they fail. You have three Ac,Fuel pump, door locks. The way i do it is turn the key on have some one put there hands and feel for the switch to work when you engage the power locks mark it with white tire crayon and feel for the ac when you turn it on it will still click even with the engine not running. mark that one also, Now the last one has to be the fuel pump relay turn the key on and it should click. if no click is heard? You have a bad fuel relay switch. replace it. If you feel the click and hear it? That would mean the fuel pump is bad. And these are in the tank. But please go with the easy stuff first. it might seam a waste of time checking the relays and marking them but i always fo this and mark them. cause you never know when your gonna need to find the relay something.
Hope i helped.
Posted on Jan 13, 2011
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.
Posted on Jul 17, 2011
Testimonial: "Thanks. That was the best answer yet.I didn't want to hear that the PCM might need to be replaced but the car has served it's purpose through the year"
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