My truck threw TEN codes this morning.

Awesome man! Waiting for PDF

 

Sharing is caring!! Unless they're needles. In that case I've got my own

 

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I know this is somewhat of a thread revival, but any chance I could get that .pdf? or someone post a pic of that filter?

My ultragauge reported 5 "Pending" error codes. I'm not sure what that means. I wrote them down, cleared them and went on with my day. They haven't come back, but I'd like to know what I'm looking for if I have to get under there.

P043E, P043F, P2401, P2402, P2419

 

P043E = Toyota specific EVAP
P043F = Toyota specific EVAP
P2401 = EVAP Leak Detection Pump Ctrl Circ Low
P2402 = EVAP Leak Detection Pump Ctrl Circ High
P2419 = EVAP Switching Valve Ctrl Circ Low

Check/replace your gas cap... but the 2419 sounds like there may be something deeper. When you gas up, do you keep shoving gas in after it clicks off? That will damage the system.

 

^^^ Careful, careful. The Tacoma ECU appears to be able to semi-permanently embed codes that can not be taken out by aftermarket code readers, but only by their Techstream. Even disconnecting the battery will not do it. For example, the Innova Pro has this problem as I found out. I currently have 12 embeded codes, but absolutely nothing wrong. In a 3-way conversation between Toyota, Innova and me that was initiated by Innova, Toyota said that these codes can be generated and stored in the ECU when major events, such a replacement of a major wiring harness is replaced. That is what they said.

 

Your Tacoma is just wanting to play a game with you! It is called Pingo. It's just like bingo. Your truck is just giving you the current listing of balls. Simply find your Pingo card and check off the appropriate boxes. If you get 5 in a row your truck will reward you with a temporary increase in mileage to 24MPG for one week.

 

Sounds like some BS to me. There is no way an ECU can tell if I replaced a wiring harness.

As for codes that can only be erased by the dealer, I also call BS. There was a discussion before on this. It violates federal law by forcing the vehicle owner to go to the dealership for repairs. That is against the law.

 

^^ So call Innova and Toyota and tell them it is BS. They were on the same call. Maybe it is maybe it is not. I still have 12 codes that are there and can't seem to be removed. I have no intention of paying a dealer to have a Techstream remove them. There is another older thread on TW about the same problem that never seemed to get any response.

 

The only codes that would fall under this description would be transmission codes.
They are stored in the TCU, and the TCU sends a code to the ECU that simply indicates "Command CEL On"

Most DIY-quality scanners can not communicate through the ECU to the trans control module, so they can't read or clear those codes.

 

Now that much I agree with. Most of the hand held scanners are only ECU scanners and have nothing to do with the transmission. My scanner that I have (MaxiDas DS708) is a full automotive scanner that can communicate with all of the systems. I have to have something like that for my shop. Of course I still hold steady on the "no way an ECU can tell I changed a harness". lol.

 

Subb'ed cause I want to see a picture of the filter to be able to clean it eventually.

 

Good luck.
It's been almost a year since it was discussed and the pdf hasn't been posted yet.

 

Anybody have a PHOTO or a DRAWING of the mystery filter?

 

FWIW, my truck is an '11 with just over 50k mi. I don't think it's the gas cap. I had to replace the gas cap on my old G20 and you could tell a noticeable difference in the rubber gasket around the inside of the cap. I'm pretty sure the cap is fine on this one.

I typically will add a few cents to round out the number. I've seen some people try to squeeze an extra dollar in there. I don't go that crazy, but I will try to put an extra few to make it end with a 0. I remember my mechanic back in the day telling me to stop filling up when it clicks, and I've listened for the most part...no more adding .25-.50 to get to an even dollar amount.

I never knew that...interesting.


Now, I've had BamaToy chime in on some other posts of mine, and I have gained quite a bit of confidence in what he says. I'm glad he's looking at this on.

Should I be concerned that they were "pending trouble codes?"

It's been 5 days since I got the codes. I guess I'll be concerned if/when they come back. I'm praying that they don't though.

2401 and 2402 seem contradictory...

 

Pending is just that.
When the ECU senses an error, it logs it as a pending DTC.
If the problem persists, then it fires the CEL and logs a code. If the problem clears, then the pending codes clear themselves after "a few" restart and run cycles. Which code determines how long before it clears.

I agree on the 2401 and 2402.

Could have been something as simple as dirt under the gasket on the gas cap that fell off later.

 

While not likely, it is possible that the cap is at least part of it. I had a similar issue with my last truck (Chevy Colorado) about 3 yrs/40K and the cap needed to be replaced. In fairness, it was obvious because the cap was not locking correctly.

I just replaced the cap on my wife's Rav4 at 120K, top of my head the cap was $30 from a Toyota dealer locally.

Not sure if it was yourself or someone else who mentioned it earlier, but I've found aftermarket caps hit or miss. On my wife's previous vehicle (96 Tacoma) she went through 3 aftermarket caps that were the correct one for her truck and none lasted 6 months before tripping the CEL. I bought an OEM and never had any more issues.

 

+1

I went through 4 radiator caps before getting a good one for my '95 Suburban.
Same for thermostats.
Stant and Murray have really gone downhill.

I'm getting to the point that the only thing I buy from auto parts stores is shop towels, hand cleaner, and light bulbs.

Their electrical components are crap. Their zip-ties are overpriced and often don't hold. Their split-loom is WAY overpriced. Their parts are Chinese junk.

 

In general you have 3 classes of codes. "A", "B", and "C". "A" codes will turn on the CEL immediately when a failure occurs. First time, EVERY time. "B" codes will turn on the CEL on the second CONSECUTIVE failure. Depending on the manufacturer however I have found that sometimes it is twice in a single ignition cycle, while others it is two consecutive ignition cycles. It's these codes that are the ones that will set a "pending" warning on your Ultra. If it fails once, it is a pending code. If it fails the second time, THEN it is a hard code, and may turn on the CEL. And just for the record, "C" codes are the ones that will never turn on the CEL, but may help a tech to diagnose a problem in the future. There are very few "C" codes out there.

 

Good to know!

They are hit and miss. I remember looking at two different ones back when i had my G20. The OEM one had a very thin rubber gasket. I had a friend who worked at AutoZone, so I had him purchase it one night with his employee discount. The one he got me had a very thick (almost baloonish) rubber gasket in it. That fixed the issue.

Now that you mention it, I have noticed that the "click" when tightening my gas cap doesn't feel as solid as it did when the truck was new. If the lights come back on, that might be a cheap and easy part to swap.