Question about 1999 Buick Century

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Car will not start - like key is not turned - fuel pump will not turn on (no lights) and can't be jumped. Is there a way to check ecm?

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You can check the ECM by testing relay sockets that it should be sending signals to. The fuel pump is a good example. You can also put a screwdriver to the injectors to see if they are getting their pulses from the ECM. Please see my tip at http://www.fixya.com/cars/r6022358-relay_check on how to check relay sockets. Please let me know if you have questions.


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Posted on Oct 08, 2010

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My 1993 nissan sentra 1.6 wont run and check engine light wont turn on,bulb is ok


Could be any of several things. If the crank sensor is marginal and not sending pulses, the fuel pump is shut off. This is for safety. The pump is energized for a few seconds as key is turned in preparation for starting then engine must rotate normally to keep the pump on. If it stops, in a few seconds the fuel is cut off.

Aug 17, 2012 | 1993 Nissan Sentra 4 Door

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So my 1995 Rodeo will sometimes not start. When I turn the key to the on position, the check engine light comes on and I can hear the fuel pump pumping, but every so often, the pump doesn't pump and the...


First things first...Rewiring the fuel pump will only put a "Bandaid" on whatever the problem really is and will most likely create a situation where wires are draped across places where they shouldn't be, causing all kinds of future electrical problems. I have had to clean up that type of mess too many times.That type of "shade-tree" repair makes proper diagnosis and repair of a vehicle nearly impossible, even by a trained technician. My recommendation: DON'T EVEN THINK ABOUT IT!

OK, Now that I have my preaching out of the way...
The check engine light is supposed to come on every time you turn the key to the "On" or "Run" position before starting the engine. This is for a "bulb-check" just to let you know that it is not burned out. It should go out immediately after the engine starts and should stay off the entire time you are driving the car. It is not any type of indicator to let you know that the fuel pump has run. If your check engine light is not coming on every time you turn the key to "On", then there is probably a problem with your ignition switch or your ECM Main Relay. Either of these can cause an intermittent failure of the ECM to power up, a)d thus, not turn the check engine light on. Failure of the ECM to power up will also cause the fuel pump to not run because like the check engine light, the fuel pump is controlled by the ECM. (Rewiring the fuel pump will not make the engine start if this is in fact what the problem is.)

I have also seen many fuel pumps that run when they want to. You could have a bad fuel pump, but refering to your statement about the check engine light, I would guess that the fuel pump is not the main problem or even if it is a problem at all.

Dec 29, 2010 | 1995 Isuzu Rodeo

1 Answer

1990 fleetwood starting prob.turn key nothing i can hear fuel pump the relays click i can jump starter. but nothing changed starter it was on its way out checked all fuses cheked all fuse links cheked key...


I would check the ignition switch. With a test light, check the small wire going to the solenoid for power when someone turns the key to the starting position. If you aren't getting power to that terminal on the starter, the ignition switch is not sending power to the solenoid.

Apr 26, 2010 | 1990 Cadillac Fleetwood

1 Answer

My 2004 hyundai sonata will not crank. It turns over but won't catch.


check to see if getting spark or fuel if no spark could be crank sensor or cam sensor have to check voltage out of wiring harness if low voltage ecm bad. Pull both coil wires off coil and have someone turn ignition no spark probably ecm. For fuel check number one plug see if wet and also listen when you turn key for fuel pump. If driving it just died on ya and battery went dead like know and you tried jumping or replacing battery.Still would not start ecm bad.

Jan 02, 2010 | Hyundai Motor 2004 Sonata

1 Answer

Fuel but no start


Sounds like the problem might be in the relay but before replacing that relay, check all fuses and especially any ecm fuses. Do you have a check engine light come on when you turn the key to the on position?I believe that on this vehicle there is a relay that is labeled "eec relay" this is the relay for the power to the ecm. eec stands for "electronic engine control" If this circuit is dead the fuel pump relay will not come on either, but worse than that the ecm stays dead and the injectors are not delivering the fuel to the engine even when you jump the fuel pump manually.
Check these items and make sure that the computer is getting power and I think you problem will be found.

There is a black wire with a connector like thing in it near the battery cable on the negative post make sure that this connection is good ,it is the ecm ground and the same symptoms will happen if it is not connected well.

Good luck. I hope this helps.

Apr 20, 2009 | 1989 Ford Thunderbird

1 Answer

Car will not start


For clarification:
When you turn the key to start, the engine will not roll over?
When you turn the key to the run position, do you here the fuel pump prime, a humming noise from the gas tank?
Have you replaced any other electronic components, key cylinder, body control module?
Let me know.
Regards,

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bad fuel pump relay

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1 Answer

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Look for a bad fuse or relay. If both check out, most likely an ECM problem

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