Question about 2000 Nissan Altima

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No power to the ecm - 2000 Nissan Altima

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  • Anonymous Sep 16, 2010

    How do you expect help with that statement?
    You need to explain in detail, what your issues are, and what you have done so far.
    You obviously must have a wiring diagram,to be asking that question, or your wasting your time.

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Volt drop the circuit to find the source of the open

Posted on Sep 17, 2010

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07 chevy cobault 2.2L no power to the crankshaft position senor from the ecm


Not really knowledgeable on your car, but if it has a cam position sensor also, I think the ECM cuts power if no signal for 2 revolutions. Any CEL codes set?

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My 2013 dodge avenger wont start. Im getting a p0688 ECM/PCM code. What should I do


P0688 (generic) = ECM/PCM Power Relay Sense Circuit /Open
P0688 DODGE - Auto Shutdown Relay Control Circuit Low

Check all the ECM fuses, if the fuses are OK try replacing the ASD (Auto Shut Down) relay.

Read more: http://www.autocodes.com/p0688_dodge.html#ixzz405J7vpq8

Possible causes:

- Weak battery - Low voltage while cranking
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- Blown ECM fuse
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- ECM harness is open or shorted
- ECM circuit poor electrical connection

Feb 13, 2016 | Dodge Cars & Trucks

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Can any. One tell me why I can. Not get a Injection pluses and no power at the crank Angel sensor on my 1999 holdan Jr. Vctar


Both those sensors(crank and cam) Have the power wire in common. They are both powered by the ECM. You'll need to find where that wire goes in the ECM plug. Probe it close to the plug. If you have power there. It is a broken wire. If no power. Pull the plug and check for corrosion. Plug it back in and recheck for power. Still no power. Check all ECM fuses Pull them and look. All good, check for power one more time. no power, replace the ECM

Nov 08, 2015 | Cars & Trucks

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Why is there no power to a new ECM?


Did you disconnect the negative battery cable before changing ECM? check ECM fuse, why did you change ECM in first place?

Jun 23, 2015 | 1997 Mercury Grand Marquis

1 Answer

On my 2001 Nissan Quest 3.3L #5 cilynder miss fire replace sparkplugs, wire, distributor, and injector still miss fire so I hook a noid light to it, it won't light up at all can it be the ECM and if you...


I don't know where it is, probably under the passenger side dash. But before condemning the ECM, check the wiring to that injector. First try to determine if it is the power wire or the ground wire for the injector which is lost. With key on, the yellow power wire should have voltage on it at the injector connector. This is independent of the ECM-only the ground wire goes into the ECM, to be internally grounded to pulse the injector. The #5 ground wire is a yellow-green wire.

If you have voltage on the power wire to #5, key on, then we know either the ground wire is bad (broken or open) to the ecm -or the internal ground for that injector is out, inside the ECM.

To determine whether it is the ground wire or the ECM, you will have to locate the ECM, pull the electrical connector off to it (Be sure and take the negative battery post off, first.), then locate the yellow green wire at pin #106 of the ECM electrical connector. Now test the continuity of that wire from the injector connector to the ECM connector-use a voltmeter set to ohms. If the wire has continuity, then the ECM must have a problem- the internal injector driver for #5 may have failed. Also look for a bent pin at #106, or anything amiss in the electrical connector. In most cases, it is not the ECM but a wiring problem.
Good luck. To locate the ECM, register for free at autozone.com, listing make, model, and year. Look under "repair guides", then component locations-it should tell you the location of the ECM.

Oct 04, 2014 | 2001 Nissan Quest

1 Answer

ECM fuse keeps popping and fuel system don't work


There should be two ECM fuses. Number one powers the injectors and some of the solenoids along with the ECM. Number two or B powers the fuel pump relay and the rest of the ECM including the sensors that provide data to the ECM. Both are 10amp circuits.
You may need to get a shop manual to have the wiring diagrams to troubleshoot the circuits.

Sep 20, 2012 | 1988 GMC S-15

1 Answer

I replaced the fuel pump relay, noticed that i had a blown fuse marked ecm. repaced that.ran truck for around 20 min.turned off. when i went to start again it wouldnt. looked at that same 20 amp fuse


There are two ECM fuses - marked ecm 1 and ecm B.
ECM B powers the fuel pump and the Veh control module which handles most of the sensors.
ECM 1 powers the ignition module, coil, injectors and the rest of the engine sensors.
You may need a repair book with diagrams to check all of the circuits for shorts.

Jul 30, 2012 | 1999 GMC Sierra 3500

1 Answer

No spark, no power to fuel pump, whole cuicuit no power.


It sounds like you may have either a ECM problem or a bad ignition switch either problem will cause you to have no power to your coil or your fuel pump. The first thing I would do is check the ECM fuse. It might be labeled ECU or ECM in your fuse panel. If you don't have a blown ECM fuse then I would look into the other two things. I hope this helps you out.

Aug 31, 2011 | 1992 Ford Explorer

1 Answer

Is it the ecm when you get no power after testing everything and it all comes back good


Possible the ECM may be bad on your vehicle but generally the ecm supplies the ground signal. Make sure to test for power with a test light and not just a dvom or volt meter as it can give a false reading. You may have power or 12vdc but not enough amps to actually carry a load. As long as all the grounds are in order and you have current to power a load then I would definitely start looking at the ecm.

Oct 11, 2010 | 1994 Oldsmobile Bravada

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