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Old 1 Week Ago   #1  
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2004 Civic Battery light on

I have a 2004 civic that has a battery light stuck on now. It starts no problem. But if I leave it idle, it will run and die at random. I've taken the alternator 4 pin out while it was running light stays on. If I drive it and give it power the car will shut off then restart. Sometimes the battery light will shut off and it will change to a check engine. I was driving it on the highway when it first happened and the "Drive" green light shutoff and so did my temp gauge. I'd throw it back in neutral while driving and restart it. When the drive green light shut off and temp gauge shutoff I have no power. Charged battery and still the same issue. If I rev the car in park, at high rpm the engine will bounce back and forth. At first I thought it was my oil since I have an oil leak and oil will lock out vtech, but I fixed the oil and same issue.
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Re: 2004 Civic Battery light on

Can anyone give me some type of idea? It's the weirdest thing because the car starts no problem. At low idle it dies pretty easy but will start right now. I still have power but it will randomly shut off to the point that it jerks you back and then restarts. Could it be ELD? MICU? PCM? Is it just a stupid ground? My grounds are **** for sure but wouldn't that affect the car starting? I need some idea because I have a 7 hour drive I need to do and don't want to pay for a rental. The battery fuse looks fine too although I broke the cap off the top awhile ago and put a piece of ducttape on top. I literally have no idea as to why the battery light is on and the car dies at random. I even put all my accessories on like rear defrost, radio, heat, high beams, etc. Looked like there was no change in rpm or anything although I guess I should have a volt meter.
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Old 6 Days Ago   #3  
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Re: 2004 Civic Battery light on

Loose bolts on the alternator bracket are common. The bracket is the ground for the alternator. If left like this it will ruin the PCM.


What is the code for the CEL?
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Re: 2004 Civic Battery light on

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Originally Posted by NDNV View Post
Loose bolts on the alternator bracket are common. The bracket is the ground for the alternator. If left like this it will ruin the PCM.


What is the code for the CEL?
I'll check the bolts, I don't get to pull the CEL Because the light shuts off. It ends up coming on for a bit and then switches over to battery light.
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Re: 2004 Civic Battery light on

OK new info I think I did the alternator 4 plug pull thing wrong. So I turn the ignition to on. The Battery, CEL, and Oil light stay on. The park light on the dash is on. But my drive light is flashing.

I left the car alone for awhile to see what it would do and then the battery light went off. I started the car and the rpm wasn't working. I turned it off and then put it back to on and it was the same as before (The 3 lights, Park, with Drive flashing).

So this time I unplug the 4 prong. The Battery light and oil light stayed on. CEL went off, and the green drive light was not intermediately flashing.

I plug the alternator plug back in and the battery light goes off.

Is it the bottom bolt to the alternator that is the ground? Anyone have a 2004 EX Alternator diagram?
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Old 5 Days Ago   #6  
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Re: 2004 Civic Battery light on

So I forgot to mention after I unplugged and replugged in the alternator with the battery life off, I heard clicking near the TCC but I don't have a manual so that solenoid is a shift lock solenoid maybe? Would it cause the flashing D and or battery light?
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Re: 2004 Civic Battery light on

I had a guy at napa test the alternator and battery when running. He said the battery was fine and that the alternator was a little low. The alternator I believe tested at like 13.3 and he said you wanted it above 14. He used a cheap computer to see if there were any CEL codes but none. He did say there were codes he didn't see with his cheap computer and that I would need someone with a better computer that could simulate the car running while off to see them. I do have a maintenance light on.

What I don't get is like what it could be? When I'm driving and the car shuts off or goes to die it just jerks you back and mostly restarts. I've never had it fully shut off when I was driving other than on the highway when it first happened and I still was moving but had like no power to move. I'm gonna tear everything down again and check to see what the issue could be.

Any ideas? Thanks.
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Re: 2004 Civic Battery light on

I tightened alternator belt and tightened down the bolts. Car just kept wanting to die when I tried to drive it distance today. The battery light went off, CEL came on, the Speedo and the thermostat gauge died. I stopped at napa.with CEL on and car just running like **** and noticed a burning smell in the cabin. He said he could only pull the code if the car is off. So we shut off the car, the CEL went away and back to a battery. He ran it anyways and no codes.

So is it not giving me codes because the PCM? The burning smell is coming from the engine bay fuse box. If I pull a fuse and smell where the fuse goes it smells burnt. Throughout the whole board not specifically to a certain fuse.
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Re: 2004 Civic Battery light on

So the alternator bolts were loose?
Probably fried the pcm
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Re: 2004 Civic Battery light on

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So the alternator bolts were loose?
Probably fried the pcm
Nah the alternator was tight. Everything seemed to be legit with it, I just tightened the spindle thing and adjusted the tension. If anything I think I may over over tightened the bolts/belt. The belt feels very tight now.

If it's the ELD, say I smell that the ELD burnt out or something. Would it affect the PCM? The ECU has a fuse specifically to it, wouldn't that fuse go before the ECU does?

My battery fuse looks cracked a little on the side with the middle piece still intact.

Is there an ECU test? I wonder if the reason why the codes aren't showing is because the ECU is fried. I just had it inspected before all this started through OBD2 and no codes.
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Re: 2004 Civic Battery light on

If you can adjust the belt tension by just the spindle thingy then your alternator mounting bolts likely are loose.

Two main mounting bolts should need to be loosened before the adjustment lock bolt and spindle thingy can move the alternator.

If the ECU is still talking via the OBD port that’s a good sign.. Can you pull live data or it simply has no shown codes?
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Old 3 Days Ago   #12  
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Re: 2004 Civic Battery light on

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If you can adjust the belt tension by just the spindle thingy then your alternator mounting bolts likely are loose.
Agree. If the top bolt is properly tightened, you won't be able to move the alternator to tighten the belt without a whole bunch of effort.
Quote:
If the ECU is still talking via the OBD port
OP beware, no codes is not the same as no communication. No communication is bad, very bad.
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Re: 2004 Civic Battery light on

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Originally Posted by Slumpertcivic View Post
If you can adjust the belt tension by just the spindle thingy then your alternator mounting bolts likely are loose.

Two main mounting bolts should need to be loosened before the adjustment lock bolt and spindle thingy can move the alternator.

If the ECU is still talking via the OBD port thatís a good sign.. Can you pull live data or it simply has no shown codes?
Bolt mounting bolts we're tightened down tight but the tensioner wasn't. But the tension IMO was at a good tension. I have no movement in the alternator but it's possible it wasn't grounded.

The NAPA guy can get maintenance codes but when whatever dies when I'm driving it turns off Batttery light and goes to CEL. Can't pull the CEL because when you turn the car off and restart the CEL is gone.

Lets say it was ECU and I can't communicate, Wouldn't I still show CEL if there were CEL issues? Wouldn't it show up in my inspection? Although the battery light showed up after.
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Re: 2004 Civic Battery light on

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Agree. If the top bolt is properly tightened, you won't be able to move the alternator to tighten the belt without a whole bunch of effort. OP beware, no codes is not the same as no communication. No communication is bad, very bad.
Yeah I know, When the car goes from battery light to CEL I go into limp mode. Star the car up and it kinda runs crappy but I get powerband back and communication, but it's risky that it will shutoff and change over to CEL.
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Re: 2004 Civic Battery light on

Tighten the alternator bolts correctly before you completely ruin the PCM.
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Re: 2004 Civic Battery light on

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Tighten the alternator bolts correctly before you completely ruin the PCM.
To be really clear you mean losing it to spec because a lot of the issues happened after I tightened it a little. There should be a little slack? Also do you think I fried the ELD at this point from what I smelled in the cabin and when I start it runs like crap?
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Re: 2004 Civic Battery light on

Here's your torque specs:


The mounting base for the alt (attached to the block) needs to be clean and tight too.

How about ground cables to the engine and trans?

The PCM gets fried when the alternator loses it's grounding. If the engine and trans lose their ground cables, that's the same effect as the alternator losing its ground from someone leaving the bolts loose.
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Re: 2004 Civic Battery light on

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Originally Posted by ezone View Post
Here's your torque specs:


The mounting base for the alt (attached to the block) needs to be clean and tight too.

How about ground cables to the engine and trans?

The PCM gets fried when the alternator loses it's grounding. If the engine and trans lose their ground cables, that's the same effect as the alternator losing its ground from someone leaving the bolts loose.
My ground from my chasis to the block looks bad. I try to clean it but still looks bad. I'll work on changing the grounds this week, changing the ELD, and putting in a new alternator.

I did hear clicking noise underneath the glove box when the car would cut out every other minute or so.
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Re: 2004 Civic Battery light on

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and putting in a new alternator.
Why? Is it bad?





Stop driving the damn car until you get the root of the problem fixed. Right now the PCM may still be saveable, but if you continue driving it this way it WILL ruin the PCM
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Re: 2004 Civic Battery light on

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Why? Is it bad?

Stop driving the damn car until you get the root of the problem fixed. Right now the PCM may still be saveable, but if you continue driving it this way it WILL ruin the PCM
Can the alternator ground out inside the coils? I drove it today and weirdly it was acting normal again aside from 1-2 small intermediate shutoffs for seconds.

Ezone when the car goes to "die" I've noticed it's when the car is downshifting or I am breaking. It's like when you are in high (3500) rpm band and the car shifts down (auto) to change to the next gear. It doesn't always happen but when it does there's a click under passenger side near glove box and then right back on.
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Re: 2004 Civic Battery light on

The PCM is freaking out from runaway voltage, and that can cause a myriad of symptoms including relays clicking, various warning lights on the dash, PCM operating in backup or limp mode, immobi light flashing, trans not shifting correctly, gauges stop working or become erratic, loss of scanner communication, and more.



Lack of ground for the alternator is not a fault of the alternator at all, and all this will still happen with a perfectly good alternator if it's not properly grounded.


What part of "stop driving the damn car" wasn't perfectly clear? How much will a PCM cost when it finally becomes permanently ruined? (plus programming)
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Re: 2004 Civic Battery light on

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Originally Posted by ezone View Post
The PCM is freaking out from runaway voltage, and that can cause a myriad of symptoms including relays clicking, various warning lights on the dash, PCM operating in backup or limp mode, immobi light flashing, trans not shifting correctly, gauges stop working or become erratic, loss of scanner communication, and more.



Lack of ground for the alternator is not a fault of the alternator at all, and all this will still happen with a perfectly good alternator if it's not properly grounded.


What part of "stop driving the damn car" wasn't perfectly clear? How much will a PCM cost when it finally becomes permanently ruined? (plus programming)
Too much, and I have no problem not driving it but I need to understand why it's doing what it's doing. By driving it I get it, more problems more money. But you explained to me why it's doing it (Runaway voltage) So I'm gonna go through it all and report back. Thanks
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Re: 2004 Civic Battery light on

Steps I would take..

Disconnect the battery.

Clean the battery contacts, leave battery disconnected.

Remove alternator, scotch brite the areas on the engine block the alternator bolts too till it’s shiny metal clean then squirt with electrical contact cleaner. do the same on the adjustment plate, bolts, and alternator itself.

Remove the ground cable near the hood latch completely, do same cleaning on the frame and engine connection points.

Remove the engine harness ground multipoint on the thermostat housing and clean.

Remove the ECU plugs and spray cleaner in each plug,

Spray the ECU contacts lightly.

Wait 15 minutes or more for everything to evaporate then plug ECU harness back in.

Reconnect battery.

Cost,less than $10.00 in materials and about 2hrs in your driveway.
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