ECM Issues - Toyota RAV4 Forums
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#1 (permalink) Old 07-21-2013, 08:01 PM
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ECM Issues

Hey everyone, I'm having some ECM problems with my 2006 Rav4 Base V6 4wd. It's got all three lights on (Check Engine, VSC, 4wd) and when I pull the code it says bad ECM, sorry I can't remember the exact code right now.

Anyway, I had seen somewhere that it could actually be something other than the ECM, even though that's the only thing mentioned when the code is pulled, but I asked the dealer about it and they said it was the computer.

Soooo, I found a used ECM on eBay part # 89661-42E90 that said it was for 2006-2010 v6 4wd and installed that. Well couple miles and all the lights come right back on, same as when I just disconnect/reconnect the battery on the old ECM. The old ECM does have a different part # though, it's 89661-42D80.

Should I ditch the one I just got and get one with the same part number and try that, or should I be looking elsewhere for the problem?

Thanks in advance
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#2 (permalink) Old 07-21-2013, 11:32 PM
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Anyway, I had seen somewhere that it could actually be something other than the ECM, even though that's the only thing mentioned when the code is pulled, but I asked the dealer about it and they said it was the computer.
The answer is yes, it could be anything like harness connection problems, or bad battery. Next time write down the code number before clearing and troubleshoot by the book, step by step.

As for the dealer, they are often clueless about troubleshooting.
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#3 (permalink) Old 07-21-2013, 11:38 PM
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Thanks, it's throwing a code right now, so I'll get it pulled tomorrow and report back.

I might have a spare battery I can try too.

ETA: I think the code I had before was P0606
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#4 (permalink) Old 07-22-2013, 12:25 AM
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I would have the battery load tested. If it fails or is borderline, replace it with a new one. When the electric power steering is being used in a low speed situation, like parking lot maneuvers, a weak battery's voltage can drop drastically, causing these problems.

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#5 (permalink) Old 07-23-2013, 07:41 AM
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Well, I remember the battery testing low last time I took it in, so I replaced it last night. CEL/VSC/4WD lights cam back on after a couple miles of driving. I'm still on the E90 ecm though. I was going to swap it back out for the old one but ran out of time last night. Somehow I doubt that will make a difference though.I haven't had a chance to take it back to autozone and confirm its still P0606.
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#6 (permalink) Old 07-23-2013, 05:49 PM
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Quote:
Originally Posted by jstalford View Post
Well, I remember the battery testing low last time I took it in, so I replaced it last night. CEL/VSC/4WD lights cam back on after a couple miles of driving. I'm still on the E90 ecm though. I was going to swap it back out for the old one but ran out of time last night. Somehow I doubt that will make a difference though.I haven't had a chance to take it back to autozone and confirm its still P0606.
A. I'm going to assume you put in your spare battery. How do you know it's up to snuff? Without a load test, it may not be in much better shape than the original.

B. Get a code reader/scan tool. For around $20 from Amazon it's a no brainer. Unless you just like visiting those nice folks at Autozone!


Amazon.com: Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles: Automotive


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#7 (permalink) Old 07-23-2013, 06:33 PM
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Actually I ended up not having a battery, so I just bought a new one, so it should be good. I didn't realize scan tools were so cheap now. I'll pick one up, although I have an autzone/advanced/napa all 2 miles from my house, so visiting isn't too bad .

Last edited by jstalford; 07-23-2013 at 10:03 PM.
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#8 (permalink) Old 07-23-2013, 10:04 PM
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So I got the code read and it was helpful. Still P0606, but also P0136, O2 sensor. So I'm going to take care of that tomorrow and see where it gets me. Hopefully that's been it all along.
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#9 (permalink) Old 07-23-2013, 10:52 PM
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Here is a thread from FJ forum. Same thing, looks like replaceing o2 sensor fixes it.
Need help with a code P0606....anyone? - Toyota FJ Cruiser Forum
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#10 (permalink) Old 07-23-2013, 11:10 PM
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That is what I was hoping as I had also read something about that on here, I believer. Fingers crossed.
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