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When u turn the key to activate fuel pump those the test light illuminate for four seconds thenstop 1.8coltvista Plymouth

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  • 3,749 Answers

For the initial prime, key on engine off, that sounds about right. To get rpm signal you need to crank the engine. W/o rpm signal, maybe no fuel pump activity.
I don't have good wiring diagram for your vehicle and don't know model year.

Posted on May 07, 2017

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Code p025a fuel pump module tested relay it is good why is there power on # 85 with key off


DTC P025A: Fuel Pump Flow Control Module Enable Circuit
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the FPCM.
  2. Ignition OFF, install a test lamp between the control circuit terminal 13 and ground.
  3. Ignition ON, verify that a test lamp illuminates for 2 seconds.
  4. ?‡'
    If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

  5. If all circuits test normal, replace the FPCM.
Relay for what ? Which engine do you have LY6 or non LY6

Aug 24, 2015 | 2009 Chevrolet Silverado 1500

3 Answers

I have a 2003 Buick Century replaced fuel pump, fuel pump relay fuel pump fuse is no power to the fuel pump what's wrong with the car? Pcm? Key switch where's the relay located


Pull the relay. Using a test light connected to ground probe the four pins in the fuse block. Two of them should have power. Connect the test light to power. Back probe the other two connectors. One should be grounded all the time, this is the power supply wire to the fuel pump. The other should be grounded when the key is turned to the run position and only for about 5 seconds.

Let me know what you find and I'll help you further.

Sep 13, 2014 | Cars & Trucks

1 Answer

My plymouth voyager runs for a couple seconds and stalls out


Have you checked base fuel pressure with a gauge ? Have you tested the asd relay ?

Mar 11, 2014 | 1992 Plymouth Voyager

1 Answer

I have a 2001 Mazda Tribute, it tries to start but will not. How do I go about diagnostics on it?


With key on, check that all warning lights and the check engine light are illuminated. Also that the fuel pump turns on for 2 seconds. You should hear a buzz or hum from the gas tank for that 2 seconds with key turned to on. If the pump is working, that means gas should be to the engine. It may be necessary to check the fuel pressure. Some parts stores loan or rent fuel pressure gauges. If fuel pressure is correct, or if you are sure the pump is putting gas up to the injector's fuel rail, then check for spark on a spark plug wire while a helper cranks the engine over.

Gas and spark, that is what you test for first. You will also need to check for trouble codes with a scan tool. Parts stores will do a scan for free. But if it won't start, that may be a problem getting to a store. So it is gas and spark. If you have both, next would be to check the injector circuit. Answer back if you need help with the circuit. All you need is a voltmeter or a test light.

Feb 17, 2014 | 2004 Mazda Tribute

1 Answer

1998 Ford Windstar Minivan: 1. I sometimes get an extended crank when trying to start engine after I've made a short trip. 2. My interior lights won't go out after I turn the engine off, so I...


YOU MAY HAVE A BAD DOOR AJAR SWITCH. HOWEVER, YO HAVE A TIMER THAT SHUTS OFF THE INTERIOR LIGHTS AFTER 300 MINUTES. IT'S CALLED A BATTERY SAVER FEATURE. TEST IT OUT.

THE EXTENDED CRANK MAY BE A CHECK VALVE IN THE FUEL PUMP IN THE TANK, ALLOWING PRESSURE TO DROP WHEN YOU TURN THE ENGINE OFF.
OR A BAD FUEL PRESSURE REGULATOR ON THE ENGIEN FUEL RAIL.

TRY THIS TEST, TURN KEY TO "ON" POSITION, WAIT 5 SECONDS, SHUT OFF KEY FOR 30 SECONDS. TURN KEY ON, WAIT 5 SECONDS, THEN START ENGINE. IF IT STARTS RIGHT UP, YOU ARE LOSING FUEL PRESSURE WITH ENGINE OFF.

THIS BUILDS UP PRESSURE IF IT DROPPED DURING SHUT DOWN.
REPORT TEST RESULTS.

PLEAE RATE, THANKS

May 16, 2011 | 1998 Ford Windstar

1 Answer

How can you tell if the inertia switch is reset? I can still see a red line in the switch.


The fuel pump inertia switch button will be flush with the switch housing when activated. Just need to depress the switch till you hear a click. You can also test the switch by giving it a sharp tap with your hand. It'll trip the switch when you do.


FUEL PUMP SHUT-OFF SWITCH

If the engine cranks but does not start after a collision, the fuel pump

shut-off switch may have been activated. The ''Fuel Reset'' indicator light

will illuminate in the instrument cluster. The shut-off switch is a device

intended to stop the electric fuel pump when your vehicle has been

involved in a substantial jolt.

1. Turn the ignition switch to the OFF position.

2. Check the fuel system for leaks.

3. If no fuel leak is apparent, reset the fuel pump shut-off switch by

pushing in the button on the switch.

4. Turn the ignition switch to the ON position. Pause for a few seconds

and return the key to the OFF position.
5. Make a further check for leaks in the fuel system.

Mar 10, 2011 | 1998 Ford Explorer

1 Answer

My 1998 plymouth voyager sometimes wont start. when i turn the key to on it makes a little humming sound for a second of two and then nothing. any ideas on what it could be?


From what your saying,your fuel pump is not working.Either perform a fuekl pressure test or,spray some 2+2 carburetor cleaner into the throttle body to see if your engine runs,if so your fuel pump is bad.

Aug 04, 2009 | 1998 Plymouth Voyager

2 Answers

How to change a fuel pump in a 2000 chevy blazer


Good Day,

I am assuming that you have the 4.3L V6.

The fuel pump is always a pain on trucks becasue you have to remove the tank to gain access. The pump is bolted in on the top side of the tank. I hope it doesn't have a full tank of gas as it needs to be drained(re-use when job is complete). Not to mention pulling a tank that's full of gas very heavy.
See this link for an overview:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a13e9

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a145a

Here's how you test the fuel pump relay, and fuel pump:

  1. Turn the ignition OFF.
  2. Remove the relay.
  3. Locate the two terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.
Fuel Pump
  1. Turn the ignition key OFF for ten seconds.
  2. Turn the ignition key to the ON position but do not start the engine.
  3. You should here the fuel pump operate for two seconds (a light electrical humming sound).
  4. Apply a 12 volt fused jumper wire to the fuel pump prime (test) connector. This should be located in the driver's side of the engine compartment. The fuel pump should operate.
  5. If the fuel pump does operate, remove and test the relay. If the relay is defective, replace the relay and repeat the test.
  6. If the relay is operating properly, connect a grounded test light to the fuel pump relay control wire (green with white stripe) at the relay. Turn the ignition switch to the ON position. The test light should illuminate for two seconds and go out. If the test light does not illuminate, check the relay control wire for continuity and repair as necessary, then repeat the test.
  7. Connect a grounded test light to the feed wire (orange) at the relay and turn the ignition key ON. The test light should illuminate. If the light does not illuminate, test feed wire for continuity and the fuse in the underhood fuse relay center. Repair as necessary and repeat the test.
  8. If the fuel pump is still not functioning, connect a fused jumper wire between the feed (orange) wire and the fuel pump motor (gray) wire at the relay. The pump should operate.
  9. If the pump does not operate, check the fuel pump motor wire for continuity and repair as necessary.
  10. If the pump will still not operate, replace the pump.
  11. If the pump does operate, start the vehicle and remove the relay. The vehicle should continue to run. If the vehicle stalls, check the fuel pump/oil pressure switch and its wiring. Repair as necessary and repeat the test.
Also see figure 4 which is digram 3 from this link, this is the schematic on the fuel pump, the fuel pump's hot wire is tan with a white stripe, if you can test the voltage of this wire you can confirm it is not an electrical problem.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f3ce

Also be sure to releive the fuel pressure before servicing

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a1468


  1. Disconnect the negative battery cable.
  2. Loosen the fuel filler cap to relieve fuel tank pressure.
  3. Connect fuel pressure gauge J-34730-1A or its equivalent to the pressure connection. Wrap a shop towel around the fitting while connecting the gauge to prevent spillage.
  4. Install the bleed hose into an approved container and open the valve to bleed the system. The system is now safe for servicing.
  5. Drain any fuel remaining in the gauge into an approved container.
Let me know if any of this is jibberish to you and I can clarify further.

Good Luck again, and feel free to ask anymore questions.

Jul 03, 2008 | 2000 Chevrolet Blazer

1 Answer

Engine size


Okay,
I love the 4.3L I have a tricked out 2000 S10 with that motor and its awesome(a few aftermarket bolt ons and those motors really scream!), I have also had an 89 Jimmy and 96 S10 with that motor so your in luck as I I know it inside and out.

The fuel pump is always a pain on trucks becasue you have to remove the tank to gain access. The pump is bolted in on the top side of the tank. I hope it doesn't have a full tank of gas as it needs to be drained(re-use when job is complete). Not to mention pulling a tank that's full of gas very heavy.
See this link for an overview:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f213

Here's how you test the fuel pump relay, and fuel pump:

  1. Turn the ignition OFF.
  2. Remove the relay.
  3. Locate the two terminals on the relay, which are connected to the coil windings. Check the relay coil for continuity. Connect the common meter lead to terminal 85 and positive meter lead to terminal 86. There should be continuity. If not, replace the relay.
Fuel Pump
  1. Turn the ignition key OFF for ten seconds.
  2. Turn the ignition key to the ON position but do not start the engine.
  3. You should here the fuel pump operate for two seconds (a light electrical humming sound).
  4. Apply a 12 volt fused jumper wire to the fuel pump prime (test) connector. This should be located in the driver's side of the engine compartment. The fuel pump should operate.
  5. If the fuel pump does operate, remove and test the relay. If the relay is defective, replace the relay and repeat the test.
  6. If the relay is operating properly, connect a grounded test light to the fuel pump relay control wire (green with white stripe) at the relay. Turn the ignition switch to the ON position. The test light should illuminate for two seconds and go out. If the test light does not illuminate, check the relay control wire for continuity and repair as necessary, then repeat the test.
  7. Connect a grounded test light to the feed wire (orange) at the relay and turn the ignition key ON. The test light should illuminate. If the light does not illuminate, test feed wire for continuity and the fuse in the underhood fuse relay center. Repair as necessary and repeat the test.
  8. If the fuel pump is still not functioning, connect a fused jumper wire between the feed (orange) wire and the fuel pump motor (gray) wire at the relay. The pump should operate.
  9. If the pump does not operate, check the fuel pump motor wire for continuity and repair as necessary.
  10. If the pump will still not operate, replace the pump.
  11. If the pump does operate, start the vehicle and remove the relay. The vehicle should continue to run. If the vehicle stalls, check the fuel pump/oil pressure switch and its wiring. Repair as necessary and repeat the test.
Also see figure 4 which is digram 3 from this link, this is the schematic on the fuel pump, the fuel pump's hot wire is tan with a white stripe, if you can test the voltage of this wire you can confirm it is not an electrical problem.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f3ce

Also be sure to releive the fuel pressure before servicing

  1. Disconnect the negative battery cable.
  2. Loosen the fuel filler cap to relieve fuel tank pressure.
  3. Connect fuel pressure gauge J-34730-1A or its equivalent to the pressure connection. Wrap a shop towel around the fitting while connecting the gauge to prevent spillage.
  4. Install the bleed hose into an approved container and open the valve to bleed the system. The system is now safe for servicing.
  5. Drain any fuel remaining in the gauge into an approved container.
Let me know if any of this is jibberish to you and I can clarify further.

Good Luck again, and feel free to ask anymore questions.

Jul 02, 2008 | 1997 Chevrolet K1500

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