check engine code 71 - Toyota Nation Forum : Toyota Car and Truck Forums

lamedoc · 09-09-2005, 02:47 PM

I recently adopted a 1995 Camry LE 4 cylinder AT, 180K miles on odometer. The error code for intermittent illumination of the "check engine" light is 71. What is the most cost-effective way of troubleshooting? Is the EGR temp sensor the most likely culprit? Can I hope to find a functioning replacement unit in a wrecking yard? Aftermarket replacement recs? Thanks very much!

lamedoc · 09-09-2005, 02:59 PM

I see that this thread was established earlier this year. Apologies for the duplication! I am curious as to whether EGR valves/temp sensors from other (lower mileage) engines would be worth a try if I find no easy solution with cleaning the EGR valves and the filter mentioned in the previous thread. Thanks again.

sixsick6 · 09-11-2005, 07:28 PM

I always wonder why people who make new threads never bother to link the original info in their thread? It would make it a whole lot easier for everyone. Example: I recently cleaned my GF's EGR valve but she still gets code 71. My guess is that the plunger is sticking because the codes goes away once she reaches 3,300 rpm and lets off the gas creating a whole lot of vacuum, and probably enough to open the sticking valve. I was planning on looking at the temperature sensor as well but I highly doubt it's the culprit. I can easily go readint through a thousand and one pages of irrelevant info before I find answers that suit the problem, so if I find a good thread then I will be sure to link it for the next guy. Suprises me that most don't think this way?

But, doing my own searches I see that the temperature sensor probably IS the culprit since cleaning the actual valve did little if any good.

http://www.toyotanation.com/forum/t64714.html

http://www.toyotanation.com/forum/t44795.html

http://www.toyotanation.com/forum/t83198.html

http://www.toyotanation.com/forum/t32184.html

And here someone finally says which resistor is needed for bypassing all together:
disabling the EGR?

It's not that hard to lend a helping hand to the next guy who will need it. Telling someone to search does little if any good if they have to search through 500 pages of boneheaded replies that don't help on the least bit.

The best help can be found:
http://camry.**********s.com/eg1.pdf

EG1-152 to 157

And a description of the EGR's function can be found on EG1-390

The EGR gas temperature sensor inspection is on EG1-230

What's so hard about that?

mazdaverx7 · 09-11-2005, 08:37 PM

try taking a look and inspecting the egr position sensor. it can give you the same code.

sixsick6 · 09-11-2005, 08:42 PM

Quote:

Originally Posted by mazdaverx7

try taking a look and inspecting the egr position sensor. it can give you the same code.

You likely have a similar EGR position sensor as I do. I have an MX6 with a position sensor rather than a temp sensor, I see no reason why it wouldn't be a Mazda thing with our cars.

I searched through the PDF and there is no mention of a position sensor unless Toyota calls it something different.....guys?

mazdaverx7 · 09-11-2005, 08:44 PM

i know for sure its on the 1mzfe. i replaced one on my buddie's sister's 97 xle. it was causing the engine light. it was tough to diagnose but it solved our problems

sixsick6 · 09-11-2005, 08:47 PM

I checked the pdf and haven't found any reference to a position sensor. Not saying that there isn't one, but my bet is that Toyota is calling it something different. Anyone know?

The pdf for that engine doesn't show a position sensor either. What does Toyota call it?

Maxemily · 09-11-2005, 10:07 PM

Here is the Toyota wording, now mind you parts and service don't always agree.

sixsick6 · 09-11-2005, 11:46 PM

Quote:

Originally Posted by Maxemily

Here is the Toyota wording, now mind you parts and service don't always agree.

Hmmm, I notice EGLS (exhaust gas ? ?) every car maker uses different abbreviations so I'm wondering if they're calling it a different part than "position sensor" I checked the pdf's and the only thing that came upwas TPS sensor which is pretty much standard.

Edit: No EGLS in the pdf

I followed the vacuum line from the EGR valve down to the solenoids at the rear of the block and the rest of the vacuum lines. I wonder if Toyota could have put them in any of a more inconvenient spot?

On one hand I see because the nipples are plastic and they really aren't something that needs to be changed often/ever so they'd want to protect them as much as possible.

Looking at this section of solenoids, the only way to get at them would be to 1) have small hands and fingers 2) remove the passenger side axle as well as the rear engine mount. This is a guaranteed route for access but quite the PITA to do if you need to.

So, I gather that the EGR position sensor must be in that inconvient mess that's called a junction, correct?

I happen to be underneath because I am changing out my GF's oil pan (Jiffy Lube cross thread her oil drain plug last time) I thought about using the next size drain plug but I'd rather fix it correctly the first time than deal with it again or have her lose her oil on the freeway. Plus this gives me a chance to fix the oil hole and tap her old oil pan for the turbo that I'll be putting in as well

FYI- A new oilpan runs $85 at Autozone.

Have any of you ever dealt with the EGR position sensor or the vacuum lines and solenoids? I'm thinking that once I actually get to them that I will extend the wiring harnesses and put the junction on the firewall instead. It's not like they make it easy to get to with a huge piece of cast iron in the way, tucked behind the axle, underneath the intake manifold and dynamic chamber, in a place that will cause you to use all your four letter words in one sentence.

Maxemily · 09-12-2005, 10:47 AM

Let me clarify that EGR position sensors are on V6 only. The fours use the map sensor to determine egr function.

If you jack up the R/F wheel and pop the tie rod end from the spindle you will find there is plenty of room to access the vsv. These vsv's go bad alot.

mazdaverx7 · 09-12-2005, 05:49 PM

the egr position sensor is located on right on top of the egr valve. its secured by couple of screws. it moniters how far the egr valve is open. its only for obd II emissions.

mazdaverx7 · 09-13-2005, 09:56 PM

did you get a chance to check check and confirm??

REAPER STRAIN · 09-13-2005, 10:20 PM

I am having the same problem too with the code 71 and then it disappears when I hit the highway. Someone please show us what an EGR valve or VSV looks like? I have no idea what to look for and the pdf or haynes manual isn't helping. Do I change it out or use seafoam for a while to solve the problem? Part no. would be good too so I can see how much it costs. Thanks

Oh, does this affect gas milages or emissions in anyway?

mazdaverx7 · 09-13-2005, 10:47 PM

the egr valve is located on the upper plenum. its actually kind of behind the throttle linkage or to the left of it if you're facing the engine. i guess it's how you look at things. it'll be kinda rusty looking with a diaphram and a vaccume line. on the 1mz, the egr position sensor is located on top of the egr valve. the 3vz has no such sensor. yes it effects emissions. you can remove it and use seafoam to clean the carbon out. you my need a dental pick to help remove the crud inside. be careful to not damage the diaphram. make sure the vaccume nipple is clean and unobstructed.

REAPER STRAIN · 09-19-2005, 05:54 PM

I solved my code 71 issue. It was a bad VSV. Luckily I had had access to my old engine that had one. I replaced it, pulled the IGN fuse to reset the codes and the error never came back. Dont know how this bad module (located on the far left side of the intake manifold) affects gas milage or how the engine runs but my check engine light is gone and I'm happy.