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

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Old 11-28-2010, 01:53 PM   #1
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Coolant temp sensors 3vze

On the back of the engine(3vze) there is coolant manifold thingy(technical term). If you are looking over the back of the engine starting on right(passenger side). You have a sensor with a black plug, Then sender for the temp gauge, another plug with a grey connector, then in front of that you have a sensor with a bluish plug. What is what? I am sorta confused.

Black plug?
Brass sending unit- Temp gauge on dash
Grey plug? - This is the temp sender for the ecm?
Bluish plug in front of grey?

Keep in mind this is a 3vze with auto and 4wd. I know there is a Water Temp Switch that is wired to the A/C Cut Relay. Is this the blue plug?

So that leaves us with the black plug. What does this do?
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Old 11-28-2010, 03:12 PM   #2
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The black plug should be the cold start injector time switch. But the colors of each sensor/sender/switch/connector can vary from year to year, or if they've been replaced with aftermarket parts. It's best to identify them by their positions. Each wire connector will have a unique shape and will only plug into it's specific sensor/sender/switch.

Seen from the front of the engine, right to left, they are:

1. Engine Coolant Temp Sender
2. Engine Coolant Temp Sensor
3. Cold Start Injector Time Switch
4. Engine Coolant Temp Switch
5. TVV/BVSV for the EVAP

PNC 89422 is the Engine Coolant Temp Sensor
PNC 89462 is the Cold Start Injector Time Switch
PNC 89428A is the Engine Coolant Temp Switch for the E.F.I.(not for the A/C, or the A/T)
Quote:
89422 SENSOR, WATER TEMPERATURE (FOR E.F.I.)
89462 SWITCH, START INJECTOR TIME
89428A SWITCH, WATER TEMPERATURE (FOR E.F.I)
Click the image to open in full size.

PNC 83420 is the Engine Coolant Temp Sender
Quote:
83420 GAGE ASSY, WATER TEMPERATURE SENDER
Click the image to open in full size.

PNC 23262 is the TVV/BVSV for the EVAP
Quote:
23262 VALVE, BIMETAL VACUUM SWITCHING, NO.1
Click the image to open in full size.

Here's a thread that also has the correct info on the locations of all of them.
http://www.toyotanation.com/forum/sh....php?p=3251158

*PNC = Part Name Code
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Last edited by MudHippy; 11-28-2010 at 03:57 PM.
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Old 11-28-2010, 05:15 PM   #3
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okay so if you look at this picture:

Blue Arrow: Engine Temp Sender for gauge?

Red Arrow: Engine Coolant Temp Sensor for EFI?

Yellow Arrow: Cold Start Injector Switch?

Green Arrow: Engine Coolant Temp Switch?

Forward of the green arrow out of sight is the TVV/BVSV

this just doesn't look right to me.

Yellow should be the sender for the gauge right?. Straighten me out.
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Coolant temp sensors 3vze-3vzemodded.jpg  

Last edited by Broncoman; 11-28-2010 at 05:40 PM.
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Old 11-28-2010, 06:19 PM   #4
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Click the image to open in full size.
Well, that is a bit odd. They're all in the "wrong" spots, except the ECT sensor. And what's with that hose connected where the CSI time switch should be? There's no such hose on mine, or any of the others I've seen. Wierd.

Not to worry, I can tell just by looking at them which is which. Regardless of where they are.

Blue arrow: Engine coolant temp switch
Red arrow: Engine coolant temp sensor
Yellow arrow: Engine coolant temp sender
Green arrow: Cold start injector time switch

I'm 99.9% positive I've got that right.

I'm gonna go look at mine to be extra sure...

Yep, that's what mine look like, just in different locations.

Mine looks just like this one(with the ECT sensor in the empty hole of course). Circled in red is the engine coolant temp switch.
Click the image to open in full size.
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Last edited by MudHippy; 11-28-2010 at 06:27 PM.
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Old 11-28-2010, 07:10 PM   #5
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Okay you confirmed what I thought was what. I have a 93 and it looks identical to the above image I snagged off this site when I was searching. You and the service manual had me lost because you and the service manual did not have the sensors in the correct location for my application.

What year do you have? It looks as though they added one hose and rearranged the sensors.

Last edited by Broncoman; 11-28-2010 at 07:14 PM.
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Old 11-28-2010, 07:27 PM   #6
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Hmmm... Mine looks like the one with all the arrows. I have that strange hose too. 94, Auto.
I've never seen it before though.... and honestly, I have no idea where it goes. I just went to install this on the new engine today and am confused
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Old 11-28-2010, 07:31 PM   #7
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The 92-95 3VZEs have a different arrangement of sensors on the coolant outlet than the 88-91 trucks did. Just to confuse matters, I guess.
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Old 11-28-2010, 07:33 PM   #8
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That would make sense. Actually looking at it, I believe the big hose connects to another hose on the firewall.... looks like it goes to the cab
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Old 12-07-2010, 10:42 PM   #9
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i have the same problem so where is the the blue connect to cause idk either....PLEASE HELP
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Old 12-08-2010, 11:55 AM   #10
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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.....
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Old 12-08-2010, 12:24 PM   #11
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Quote:
Originally Posted by banoobee17 View Post
i have the same problem so where is the the blue connect to cause idk either....PLEASE HELP
Where is the blue connect to? Blue what? Do you mean the blue sensor? Or blue connector?

Either way they should go togethor. Blue matches blue. Of course that's not always the case. The connector that plugs into my blue sensor is actually clear(no color).

Like has been stated the blue sensor is the engine coolant temp switch, if that's what you're wondering.

Quote:
Originally Posted by Swim View Post
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.....
Blue sensor square plug??? I assume you mean blue sensor with a rounded plug.

How important is it? Important enough.

If the wire is snapped off the plug, then just pull the plug apart and reconnect the wire. Shouldn't be that hard to do. They're made to be serviceable that way. If the wire isn't long enough anymore, then splice in a short piece to make it a little longer.

I wouldn't leave it unplugged.
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Last edited by MudHippy; 01-08-2011 at 04:13 PM.
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Old 12-08-2010, 03:10 PM   #12
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MudHippy - I owe you a growler of Alaska's Finest. You seriously saved me a ton of time. I did some surgery to the plug and managed to get some extra wire attached. Looks good as new.

Seriously, if you come up this way, look me up. I owe you a scenic flight and some good beer.
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Old 12-08-2010, 03:16 PM   #13
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glad you got this figured out, i was just about to fill ya in on which ones are which lol i had to figure em out too
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Old 12-08-2010, 04:56 PM   #14
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Quote:
Originally Posted by Swim View Post
MudHippy - I owe you a growler of Alaska's Finest. You seriously saved me a ton of time. I did some surgery to the plug and managed to get some extra wire attached. Looks good as new.

Seriously, if you come up this way, look me up. I owe you a scenic flight and some good beer.

Yeah, no problem. I'll do just that, should I ever end up in Alaska.
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Old 02-06-2011, 06:08 AM   #15
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I would like to figure out where the coolant sensor is that the ECU gets it's readings from which directly effects how the engine idles. My truck has issues with being able to hold a steady idle although the coolant level is ALWAYS full when I check it. I can't make any sense out of the information provided here. The picture with the 4 colored arrows 'may' have finally been broken down correctly, but it is such a small pic that I can't tell one sender/sensor/switch from the other.
I'm guessing that the sensors/senders/switches can be located in slightly different orientations and even colored differently. so maybe if someone could offer a pic of what the connector looks like for the ECU sender?/switch?/sensor? that would have an effect on how the engine idles?
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Old 02-06-2011, 07:33 AM   #16
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It looks like these on the 89 and newer models. Notice how the tabs are located vs. the cold start injector time switch that's relatively similar in appearance(center in pic below).
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Is it going to affect how the engine idles? Possibly. But so could a lot of things.
http://personal.utulsa.edu/~nathan-b...63troubles.pdf
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Old 02-06-2011, 08:58 AM   #17
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Old 02-06-2011, 09:47 AM   #18
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Well, I'm sure ALOT of things can effect the idle. How does one figure this out though without somehow eliminating components?
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Old 02-06-2011, 10:36 AM   #19
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Simple. You look in the FSM troubleshooting section under the heading "Poor idling". Determine based on the symptoms which sub-heading applies. Is it "Incorrect first idle", "High engine idle speed", "Low engine idle speed", "Rough idling", or "Misfire"? Then start with number 1 under the appropriate sub-heading and work your way down the list untill the problem is solved. Then you know which components need eliminated/ruled-out, and in which order to do so. How the hell would I know how to "figure this out"? I don't even know which sub-heading applies.

Here's that link again, in case you missed it. http://personal.utulsa.edu/~nathan-b...63troubles.pdf
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Old 02-06-2011, 11:42 AM   #20
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MudHippy, I'm sorry. You're correct.
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Old 02-06-2011, 11:42 AM
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23262, 3vze, blue, bvsv, cold, coolant, engine, sensor, snsors, start, switch, temp, temperature, time, toyota, tvv

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