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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

egr air temp delete

Old 04-25-2019, 05:16 PM
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Exclamation egr air temp delete

I have a 1991 Toyota pickup and I need to know if I buy a 1/4 watt or 1/2 watt 10K resister my cel is on with code 71.
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Old 04-25-2019, 08:01 PM
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Welcome to YotaTech.

I assume you're trying to pass smog (which is an automatic fail with a CEL). You would have to be REALLY lucky to find a smog tester so dim that he'd miss a hacked EGR temp sensor. And that sort of attempt to work around the regs could end up being very expensive.

Here's the FSM on the EGR. http://web.archive.org/web/201204061...77exhaustg.pdf Work your way through that, and fix your EGR. If you have questions, come back here. Your posted question suggests your understanding of automotive electronics is limited.

Not only will you avoid a whole mess of trouble, you be cutting back on NOx pollution. It's the air you're breathing, too.
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Old 04-25-2019, 09:05 PM
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EGR air temp delete

Thank you. No I'm not trying to pass smog we just wanted to delete it because we have tried almost everything to fix it and the cel Keeps coming on.
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Old 04-26-2019, 06:42 AM
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EGR air temp delete

Just wanted a simple question answered did not need the schooling or any other comments. Thanks for nothing!
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Old 04-26-2019, 08:38 AM
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Thats not a great attitude to get help. You got that answer because a very high percentage of people ask that question for that reason. And then scream when they failed smog. If your so set on "you tried everything to fix it" then I bet we can help you fix it. There are several people on here that are amazing at trouble shooting EGR systems.

If you want a "patch with a resistor" then just google it... or try the 2 you think will work. But check the bitter attitude at the door if your asking for help.
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Old 04-26-2019, 08:38 AM
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If you had tried "almost everything," you would have fixed it long ago. So I assume you tried one or two things you found posted on the internet, and now you want to give up. That's why I provided you with the FSM on EGR; just follow that and you'll be good.

You do realize that the resistor hack doesn't fix anything? It's basically the same as putting electrical tape on the instrument panel. Just costs a little more.

But your "simple question" is something you can figure out on your own. You could measure the sense voltage (I'm guessing it's around 5v), but you don't even need to do that. You know that the sense voltage can't be any higher than battery voltage (figure 14.1v with the alternator running). Now you know the resistance and maximum voltage. I'll leave it to you to look up how to figure power dissipation from those two numbers.
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Old 04-26-2019, 10:44 AM
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No attitude just wanted to know if I need 1/4 watt or 1/2 watt 10K resisters come in different watts. So this YOTATECH is quite pointless if you want a simple answer.
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Old 04-26-2019, 10:49 AM
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Sounds like a bunch of macho guys on here that can't answer a simple question!!!
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Old 04-26-2019, 10:53 AM
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Nah, we just want to help you fix your Toyota right.

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Old 04-26-2019, 12:59 PM
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Originally Posted by CindySue
Sounds like a bunch of macho guys on here that can't answer a simple question!!!
There are other websites available and a few you should probably avoid. We will let you figure that out on your own. We just like to fix it right. So someone isn't screaming at us for either I didn't pass smog and I need this fixed yesterday. Or my motor blew up and I meed to know why.

If you want an answer. Stop being lazy and get to radio shack and buy both resistors. Solder one in and if it works great. If not remove it and do the other. Seems like you know enough already. Or just put a piece of electrical tape over the CEL. Its the same quality of "fix". Its a lot quicker and cheaper.

Edit: took me 20 seconds of googling to get the correct answer... hope you fix stuff better than you google.

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Old 04-27-2019, 04:53 PM
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Originally Posted by thefishguy77 View Post
...
get to radio shack and buy both resistors. Solder one in and if it works great. If not remove it and do the other.
A: what is a radio shack? They'll let me have parts out of my local cell tower?!

They went bankrupt again, this last time was fatal. If you still have one locally it is privately owned and not a franchisee.

B: that isn't how resistor power ratings work. Best case scenario if you exceed the power rating it burns out internally with no fire or explosions, worst case it explodes and sets something on fire..


Anyways this circuit is low voltage and current limited. It doesn't matter what the power rating of the resistor used is.
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Old 04-28-2019, 06:50 AM
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Amazingly accurate, helpful info...
Thank you macho men that take your time and share your experience and expertise with those of us that are electronically challenged and appreciate your help.
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Old 04-28-2019, 09:08 AM
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Originally Posted by old87yota View Post
Nah, we just want to help you fix your Toyota right.

You must have missed this part.

A resistor does not actually fix anything, it just gives some the warm and fuzzy feeling that the check engine light is no longer on.

What we were suggesting is that since the Thread Starter said that they tried multiple times to fix the problem but could not find what is wrong, is that we can help figure out what is actually wrong.

I think this rings true for the people who have already posted, regardless of the system we are working on.

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Old 04-28-2019, 11:51 AM
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No, I think old87yota hit the point just as you described it. He was responding (I think) to a complaint that "we" are macho guys who can't answer a question. Sure, we can answer it, but it's the wrong question.
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Old 04-30-2019, 11:46 AM
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What scope said is right. The resistor will take the code away, but that will not fix your issue. I had the code 71. Slapped a 10 ohm resistor on and it went away, but I still tried to everything I could to fix the EGR system. Which it turned out to be the temp sensor. Swapped that bad boy and the thing works like a charm.
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Old 05-09-2019, 09:26 AM
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OTher options to consider.
1. burn the CEL bulb
2. Put black tape over the CEL bulb
3. Change CEL bulb to a black bulb
4. Add a resister to CEL bulb
5. Remove the CEL bulb
6.... I can't think of anymore. lol
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Old 05-09-2019, 10:11 AM
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But in the interest of efficiency, you could replace the CEL with a DED (Dark Emitting Diode) https://www.edn.com/electronics-prod...Dark-Flux-Watt when you use LEDs in the back lighting.
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