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

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Old 02-06-2011, 01:43 PM   #21 (permalink)
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so could this part keep my engine from starting? I would just take it off and check it but im unable to check it without breaking the connector, as it permanently attached.
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Old 02-06-2011, 05:40 PM   #22 (permalink)
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Oh, I wouldn't think so. But I suppose it could. That's just not very common atleast. Why is the connector permanently attatched? That won't make replacing it any fun...
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Old 02-06-2011, 05:59 PM   #23 (permalink)
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Alright well thats nice to know, Im just not getting injector pulse so trying to see what could cause the ECU not to fire the injectors, when I did the head gaskets the little clip on the harness broke so my dad had the idea we could put some blue silicone on the connector and it would hold it on, well now there is no way to get it off without breaking it to pieces.
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Old 02-06-2011, 06:41 PM   #24 (permalink)
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Well, you gotta do what ya gotta do.

So you're not getting any codes? I would think you would if the injectors aren't firing. And if the ECT sensor's not working, there's a code for that too. So if you're not getting a code 22, then you can look elsewhere for the root cause the issue. It could be a number of things that would cause that, from shorts in the wiring harness to a faulty ECU. Most of those would throw a code though.

Here's the list of codes and how to check for them. http://personal.utulsa.edu/~nathan-b...85diagnosi.pdf

There's ways to replace the connector too, if need be.
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Old 04-03-2011, 09:12 AM   #25 (permalink)
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This thread had both helped me and confused me. My '92 3VZE Pickup only has 3 sensors in that coolant manifold. My '91 Runner had more and they were in different locations, and there also wasn't a big heater hose coming off the manifold.

Here are two pics of the coolant manifold on my '92. I am pretty sure they are (from left in these pics to right in these pics), CSI time switch to the left of the heater hose, ECT sender (for gauge) to the right of the heater hose, and then the ECT Sensor last, all the way to the right, and then another heater hose. It's pretty similar to the picture above with all of the arrows, except I don't see a ECT Switch located anywhere back there.

Has anyone else seen them configured like this? Is it possible that they did away with the ECT Switch at some point? Doesn't seem likely to me, but I don't see it anywhere. Trying to diagnose a hard warm start issue, and have the ECT Sensor disconnected right now, starts perfect with it disconnected, but have the CEL on. Ohmed out the ECT Sensor with my meter on the 2000K ohm setting and got .79 when the engine was warm, need to find a chart to see if that's within specs.

Anyway here are the pics of the back of my engine, anyone see an ECT Switch back there?

Click the image to open in full size.

Click the image to open in full size.
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Old 03-13-2012, 09:14 PM   #26 (permalink)
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Raising the dead here...

I've noticed a third coolant manifold. All of my research has led me to either the newer manifold here (bypass hose in center, ignore the red circle):

Click the image to open in full size.

or the older manifold here (bypass to the side, ignore the red circle):

Click the image to open in full size.

but nothing like my manifold below (bypass to the side, additional sensor). '90 4x4 all options, was originally an AT.

Click the image to open in full size.

I know the ones in white are correct but I'm looking for confirmation on 1 & 3:

1 - temp switch (AT/OD?)
2 - time switch (CSI)
3 - temp switch (AC cut/ECM?)
4 - temp sensor (ECM)
5 - temp sender (gauge)
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Old 03-14-2012, 05:18 AM   #27 (permalink)
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i know some 4runners have extra heater hose because they have rear heat under the center console
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Old 09-23-2012, 08:41 AM   #28 (permalink)
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Quote:
Originally Posted by BMcEL View Post
but nothing like my manifold below (bypass to the side, additional sensor). '90 4x4 all options, was originally an AT.

Click the image to open in full size.

I know the ones in white are correct but I'm looking for confirmation on 1 & 3:

1 - temp switch (AT/OD?)
2 - time switch (CSI)
3 - temp switch (AC cut/ECM?)
4 - temp sensor (ECM)
5 - temp sender (gauge)
I'm not 100% sure what they do. But I do know for sure what they are so far as their Part Name Codes.

However...

I think the purpose of 1 is probably related to the A/C cut off relay, and would be used to limit the use of A/C to when engine coolant temperature is below a certain threshold. Which the terms temperature detection switch imply(as apposed to sensor, sender, or gauge). Since it essentially switches the A/C ON/OFF.

I think the purpose of 3 is probably related to the FPU(Fuel Pressure Up) system. In which case it would be used to actuate the VSV for the FPR(Fuel Pressure Regulator) when engine coolant temperature is above a certain threshold. Which the terms temperature switch (for E.F.I.) imply(as apposed to sensor, sender, gauge, or switch for another system). Since it essentially switches the FPU system ON/OFF(and since FPU is an E.F.I. subsystem).

1 - 89428 NO.2 TEMPERATURE DETECT SWITCH
Click the image to open in full size.
http://www.toyotapartseast.com/Page_...3521,3523,3524

3 - 89428A WATER TEMPERATURE SWITCH (FOR E.F.I)
Click the image to open in full size.
http://www.toyotapartseast.com/Page_...3521,3523,3524
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Last edited by MudHippy; 09-23-2012 at 12:58 PM.
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Old 10-13-2012, 03:55 PM   #29 (permalink)
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Need help matching wires with sensors!

After doing a lot of research as to why my O/D doesn't kick in, I think that it is probably my ECT sensor. I have an 89 pickup automatic with the 3vze that I bought about a year ago, and I am slowly bringing it back from hell.

I'm thinking the sensor is done for and sending bad readings to the computer. The temperature gauge seems to work fine but the sensor must be faulty and making the computer think its never at operating temperature.

I bought this truck about a year ago, and it had tons of problems. The wiring harness had been completely cut around the intake/tps area and almost every plastic connection was falling apart. I have replaced many connectors like the fuel injector connectors and I though I had fixed all wire cuts that were made in the past, but today I found a few more when I went to check out the ECT sensor area.

I took this picture today and found some problems:
Click the image to open in full size.

By looking at the picture, it seems the connectors to the ECT sensor (#2 in pic) and CSI Time Switch (#1 in pic) fell apart or were cut. But the only one that was "temporarily fixed" was the ECT. The wires for the CSI time switch have been cut and are to the left of the picture. I realize now that I need a new connector for the ECT sensor and for the CSI time switch. But since all I have is wires, I need to know where each wire is supposed to go so when I get replacement connectors I install them right. If someone could help me out in identifying what color wire is supposed to go where It would really help me out.

So it seems that I have not had my Cold Start Injector Time Switch connected since I have had my truck. My truck does have trouble starting when its cold out, is the reason why? and my ECT sensor looks like it has never been replaced so could this is be why my O/D never works?


I have a couple other questions after taking this pic:

Where is the ground labeled in the pic supposed to be connected to? You can't see it in the pic but it has been cut and I moved it to the right to be out of the way.


The TVV/BVSV is labeled but not really in the pic.

A while back, I used to have "fume" smells in the cab and I came to find out it was a hose from the charcoal canister that was to be plugged into the TVV/BVSV. I plugged it in to the empty slot of the TVV/BVSV but according to a FSM diagram the hoses should be plugged in opposite of where I have them. The diagram showed that the small hose coming from the charcoal canister should be plugged to the top slot of the TVV/BVSV and the bottom one to the metal line to purge.

Does this make sense? Does it matter what slot of the TVV/BVSV these hoses are plugged to? This is the diagram I came across and currently my hoses are plugged opposite of this diagram. I just want to know if I should switch them or if it doesn't matter.Click the image to open in full size.
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Old 10-13-2012, 04:49 PM   #30 (permalink)
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So it seems that I have not had my Cold Start Injector Time Switch connected since I have had my truck. My truck does have trouble starting when its cold out, is the reason why?
Without the CSI, the truck should be harder to start when cold. (Other things can make it hard to start, but it is designed to have a CSI and that is its purpose.)
Quote:
Originally Posted by MGM719 View Post
and my ECT sensor looks like it has never been replaced so could this is be why my O/D never works?
There is a temperature sensor for the O/D, but I can't say for sure which one it is. The transmission won't go into O/D when coolant is cold.
Quote:
Originally Posted by MGM719 View Post
Does it matter what slot of the TVV/BVSV these hoses are plugged to?
No. It doesn't matter, it's just a "valve."
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Old 04-20-2013, 02:43 PM   #31 (permalink)
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I got a 91 yota 6cyl and it is very hard to start when cold it fires quik as normal but seems as if something is being choked fuel is my guess I do not smell excess fuel there is a lot more smoke than normal until its reached temp. And it idles ruff until it reaches temp also the check engine is on while this is going on I pulled the code it say the coolant temp sensor. Could that be the culprit I just did the knock sensor job (nightmare) and remember bumping that coolant sensor with the upper intake. Mechanic told me it was the cold start injector which would make more sence to me once its warm it fires up perfect runs great and I don't have any cooling issues just in the morning when I get up depending on the temp outside I could be trying to start it for 15 min I know this ain't no cold blooded Chevy any suggestions badass site by the way got me threw my knock sensor job
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Old 12-08-2013, 09:35 AM   #32 (permalink)
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Quote:
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Ok, so in that photo. The blue Sensor with the square plug... How important is that? My actual wire snapped off the plug on mine and I have no idea where to get a new one. Does anyone have a wiring harness laying around that they can cut one off? Can I leave this unplugged? Help.....
I cracked the housing for all thecoolant sensors while trying to remove the vsv (two nipple vacuum switch) So I bought another 'coolant manifold' from someone but heres my issues: the replacement doesnt have a port for coolant tempurature switch (small blue plug) ...im guessing that this is because his truck was a stick and mines an auto....so should I jb weld my original coolant block or ? Im thinging theyre not interchangeable....what is the purpose of the little blue sensor (found on automatics only from what ive read)....something to do with over drive?

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Old 03-17-2014, 01:04 PM   #33 (permalink)
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Hi Guys, need some help on this topic.

I am trying to find the right part number to get for my 3vze. I need this temp switch.
http://www.toyotapartsoverstock.com/...942814070.html

However, when I go to the following link and check fitment against vin number, it says it is not the right one. But, i can't find another part number.
http://www.toyotapartszone.com/Page_...VN39W4M0072152

The issue is that my 4Runners production date is August 1990 and in august some things changed so bunch of part numbers/parts changed. How can I confirm if this part number will work on my engine?

EDIT:
In addition.. i can't find this "Engine Temperature Switch" in the FSM, or the wiring diagrams available. I even looked at the whole list of the connectors going into the ECU, and none are the elusive temp switch. What does this engine temp switch do?


Thanks.
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Old 03-17-2014, 07:15 PM   #34 (permalink)
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I can't tell from your description what you are looking for, but ...

IF you have 4wd and AC, then there is an additional temp switch (to shut off the AC if the engine gets too warm).
http://www.toyotapartsoverstock.com/...942889101.html
http://personal.utulsa.edu/~nathan-b.../2aircondi.pdf
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Old 03-17-2014, 08:47 PM   #35 (permalink)
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Yes, that is the one I am talking about scope. I guess it shouldn't effect the engine or ecu system then. I won't have to get this one for now

Thanks for the reply! The part number I had was for the pre August 1991 cars.

Click the image to open in full size.
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Old 03-17-2014, 08:47 PM
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