200 Echo Check Engine Light - Toyota Nation Forum : Toyota Car and Truck Forums

Let's Go Mets! · 07-25-2008, 10:10 AM

I hope someone can point me in the right direction.

Check Engine Light has been coming on intermittently since 2004.
Dealer couldn't give me a specific reason why, and wanted hundreds of dollars to try a couple of things (engine flush?)
I declined; I want an actual diagnosis, which they couldn't provide.
Here are the codes:
P300, P301, P171

P171 no longer comes up after MAF sensor was cleaned.
02 sensor has been replaced.
Spark plugs have been replaced.

Random misfire keeps coming up. All the resistance was the same in the coils when we checked.
The check engine light will come on, stay on for about 4 days, and now it's shutting itself off for about 4 days. Then it comes on again.
Okay, yes, I'm at wit's end.
This car runs very well, and has never given me any problems. Yet when this light comes on, I get very uneasy. Something must be wrong.
I have 47K mileage.
What is triggering this check engine light to come on?
Any help, suggestions most welcome.

Qslim · 07-25-2008, 11:20 AM

Do you consistently get 301 and 300 now? If you do, you can narrow it down to the first cylinder. P0300 (random misfire) will almost always set before the computer narrows it down to a specific cylinder.

Let's Go Mets! · 07-25-2008, 12:11 PM

Qslim, I have gotten a P302 reading in the last month also.

If I can narrow it down, do you think the coil is the problem?

Let's Go Mets! · 07-31-2008, 02:46 PM

bumping thread...anyone have any ideas?

***toyomoho*** · 07-31-2008, 03:18 PM

P0300 is a random misfire code. The computer senses random cylinder misfire every 200 or 1000 revs.

P0302 is misfire on No 2 cylinder. Same but only the No 2 cylinder.

P0171 is fuel system too lean and the computer being required to adjust it richer.

Did the P0300 code go away along with the P0171 code after cleaning the MAF? The MAF may have caused the P0300 but after cleaning the issue is limited to No 2 cylinder.

Let's Go Mets! · 07-31-2008, 03:21 PM

Thank you for answering.

p171 did go away after the cleaning. I was okay for 3 months and thought we had finally resolved the problem.

About a month ago, it came on and I have recorded 3 codes, P300 and 301 and 302. And then the check engine light goes off. Mostly, I get the P300 reading.

It's been running beautifully in the past week, with no light.
But I know it will be back.

Qslim · 07-31-2008, 11:11 PM

I meant to look for a service bulletin for you the other day, but I forgot.
Check out TSB EG009-00 titled "MIL ON, P0300, P030#". It involves replacing the engine computer and has the VIN ranges that will tell you if it is applicable to your car. Hope this helps.

Let's Go Mets! · 08-01-2008, 10:22 AM

Qslim,
Do you have a link? I found the service bulletin, but not the applicable VIN#.

Thank you.

Qslim · 08-01-2008, 10:57 AM

enriquem91792 · 08-18-2008, 11:12 AM

Does any one have any additional information on this issue? I also have a 2000 Echo with the exact problem mentioned on this thread. The car runs great but the check engine light is on all the time and it's always the same thing, P0300 and P0304. I've had a fuel system cleaning, one mechanic told me it was a vacuum leak, supposedly fixed it but light came back on after a week. I've had the spark plugs and coils checked and nothing. The Toyota dealers in my area are not known for their honesty so I don't want to hand them a blank check. I'd like to have some idea of what's wrong before I take it in and have them take me.

Thanks

Qslim · 08-18-2008, 11:16 AM

How much more information do you need? The TSB addressing the information in this post. You're VIN is probably within range, so you'll need a new computer.

Let's Go Mets! · 08-18-2008, 12:06 PM

My VIN was not in range.

So if I continue to run my car with the check engine light on, although it shows no sign of rough idle or any other problems--

What kind of trouble am I asking for?

Having priced a computer replacement, I can tell you it's been quoted at over
$1000.

Honestly, I am thinking of buying a new used car, and not a Toyota.

***new echo owner*** · 08-27-2008, 09:06 PM

You may want to find out when the codes are set; when the engine is cold or when the engine is hot soak. If you have a leaking injector either when it is cold or after you have driven the car and set for a short time, it may trigger a misfire code but not necessarily have a rough running condition. If you can get hold of a scan tool and read the freeze frame data, it might give you some indication when the code is set. If you know when the code is set then you can narrow down on what maybe causing the misfire.

Some times on rare occasions, if you have a head gasket that leaks a small amount of coolant into the cylinder when set over night, it will also cause a slight misfire during cold start. You may or may not notice the misfire since the engine maybe on fast idle, but the ECM can pick it up after two trips; same situation with leaky injectors.

Hope this help in some way,

N.E.O.

Let's Go Mets! · 08-28-2008, 07:37 AM

Thanks for the reply; mine seems to go off when engine is hot.

Right now, it's off and has been for a week.

***new echo owner*** · 08-28-2008, 09:08 AM

It is possible that your concern may be cause by bad fuel or sticky injectors. What kind of fuel are you using?

Sometimes, it may help by running some injector cleaner or Techron through the fuel system. Actually, it wouldn't hurt even if you don't have a problem, helps to minimize build up in the fuel system.

N.E.O.