Question about 2004 Toyota RAV4

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When the engine is in low rpm the battery light comes on and when on high rpm light go off. Check belt ok,check voltage with voltmeter at high rpm its 14 volts I don't no what's the pr

N40 battery

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Sounds like the freewhell clutch on the alternator is worn and not spinning the alternator fast enough at low revs to put a charge into the battery.

Posted on Nov 21, 2014


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Posted on Jan 02, 2017

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SOURCE: Check engine light comes on & engine bogs down

you need to have it scanned for codes

Posted on Nov 11, 2008

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SOURCE: check engine light and vsc lights come on but do not stay on

Had something similar with my 2wd 2004. When I first bought the car saw this 1 time in the first 25K miles, but not again until 6 months ago. I now have 94K and all the MIL laps lit up, but it only appread during high speed driving. (50 mph+). After driving around town slower, the lights would go off. (VSC lights, and all would come on). The dealership troubleshot and told me it was a steering position switch (which they said they hadn't seen in a Highlander go bad, but the computer and tech assured me that was the problem. $700 (300 parts, 400 labor).!! I made it clear that it better be the fix. After I got the car they said they drove it and the problem was gone. I took it out on the expressway and the lights came back on. I came back and took the technician for a drive and showed him. He scanned again and found a metal piece stuck in the ABS pick-up in the drivers rear wheel. Removed chunk, reset codes, problem resolved. Dealer swears I had a bad position switch but I don't believe it. The upside is with almost 100K miles, other than oil, 1 set of brakes and i set of tires, thats the only repair on this vehicle.

Also for those that have A/C heat problems, pull the knob off of the heat/cool selector (red/blue) and tighten the nut that holds the potentiometer on, I learned this from another forum and found my loose!

Posted on Dec 02, 2008

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SOURCE: engine check light on

2002 toyota camry (4cyl) engine check light come on when I run high speed 80mph

Posted on Mar 07, 2009

  • 2007 Answers

SOURCE: 1998 toyota corolla shakes before 2 rpm, check engine lights up

Not sure what is causing it, but it sounds like you're running on 3 cyllinders. Check plugs, wires, timing . timing belt may have jumped, bad injector, low fuel pressure.

Posted on May 13, 2009

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SOURCE: engine check light, code 401 low egr vacum egr

The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

Posted on Dec 03, 2009

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If a check charging system message comes up then I would suggest you check your charging system... Meaning check to see if your alternator is putting out the right voltage and in most cases that would be about 13.5 volts.

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Loose or corroded battery cables, Loose fan belt not turning alternator fast enough, Bad alternator, check the battery with a Voltmeter, voltage with engine stopped. should be slightly over 12V Start engine and check again.. shoiuld be over 14V. this is if the alternator is putting out a charge. Chech the output at the alternator. the BATT connection. usually a larger red wire. should be 14V+ with engine running. Since the A/C works fine with the engine running.. I would have the battery checked.. sounds like bad battery.

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The battery light means the alternator is not charging the battery. The charging system would need to be checked out when the light is on.

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Flickering/Dimming Lights

you forgot, does it do that running engine or not.?
ok the main battery is car is doing that.
use a voltmeter, at the battery or even at the CIG lighter port.
12.6v DC, not running. rested. running voltage is 13.3v to 15vdc,

start engine, is rpm above 800 RPM at all times, or more?
if not, the alternator will be too slow, and drop out and when that happens , the lamps will dim. (a 3 volt drop does that)
1: all fuses good
2: battery term lugs clean, not green
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4: charge lamp on dash not ON, running.
5: check engine lamp not on, running (if yes,scan it now)
6: test the battery , batteries are LOW life objects, (die-easy-not-hard)
test the battery , using a load tester or take it in for testing, it's free.
or try a spare battery from another car. do not reverse POLARITY.
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Not if your alternator is faulty.
Check the battery voltage first, that will prove alternator.

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2003 ranger. With enging running alternator light comes on steady until the engine slows to low idle at which point light goes out. As soon as rpm increases light comes back on.

Attach a multimeter to battery and set at DC voltage. Measure voltage output at idle, then rev engine until light comes on and check again. That will tell you whether it's an overcharge or lack of charging causing the problem. Make sure you check belt condition and tension before, to eliminate that as a cause.

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Battery and brake light came on ,on my hydia elantra whats wrong

for the battery light, test the alternator. If you have a voltmeter, check voltage at the battery with engine running. Voltage should be at least 14 volts. If you don't have a voltmeter, take the alternator off and take it to the parts store for testing.

for the brake light--may be caused by the alternator problem, but at least check the brake fluid reservoir. If it's low, refill and check the car for leaks at the wheels or below the reservoir/master cylinder.

Please let me know if you have any questions.

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OMG!! its a nightmare! Help!! i turned my navigator this morning and the battery light stayed on the dash board...when i accelerate it either blinks or goes off for a few and it comes back on...i had put a...

Yes. There is a very good possibility that your alternator is beginning to fail. The battery only starts the car and maintains nominal accessories. The alternator on the other hand actually provides the fire/spark for the engine after it has started o keep the engine running.
The light coming on and off is indicating the alternator is failing or falling below what is needed for the engine. When this occurs the system defaults to the battery, where it drains the battery. At higher speeds/RPM's the battery light is probably turning off - right?
A very easy way to check this is to start the vehicle, and with the engine running, remove the Negative (black) Cable going to the Battery. If the engine dies, it is the alternator and needs to be replaced immediately. Once an alternator fails, it will drain and kill the battery.

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My 99 windstar headlights are dimming, the abs light has come on and at times will not start. van has a new battery?

Clean the battery terminals.

Check the alternator voltage.

Just start the van if you have to.

Check the voltage at the battery terminals.

It should read 13.8V to 14.2V.

If the pully tensioner is from 1999 then it's time to change it.

Check belt the cracks.

After the tensioner change and belt change then double the voltage.

It has to be 13.8V or high.

If not then change out the failing alternator,

Please rate my answer if it's helpful to you.



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sounds like the belt is loose. if it has a tensioner check and or replace it, if not tighten the belt. or the alternator tests ok but is actually not working at low rpm. or the battery is shorted. electricity is tricky

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