1FZ-FE head sensor ID (1 Viewer)

[Malleus]

I have a broken head sensor that I need to ID. The truck is a JUL1995 model, US spec. The photos show the intake side, front is to the left. The sensor photo wouldn't cooperate; the order shown is top-bottom = front to back.

The first (leftmost, or front) sensor should be Gage assy, water (83420-16040)
the second sensor should be Thermistor assy (88790-60050)
the third, I can't find in the parts diagrams.

It's clearly not the same as 83420-16040, that one has a 14mm thread. The port in the head is 10mm.

 

[COYS]

Temp sensor part number

I've spent considerable amount of time trying to find this part number, and I now concede defeat. lol I'm sure it's here somewhere... Can someone provide the name or part number for this sensor? Thank you!

forum.ih8mud.com

The ECT sensor which I bought new, IIRC, came with the washer. The others, which I also bought new from T, came with loctite on the threads.

 

[Tedward]

Here:

Just be careful not to knacker your knock sensors, they are expensive to replace.


View attachment 2170807View attachment 2170814

 

[Malleus]

Yeah, lost that battle already; 1 of 2 disintegrated. The entire engine harness on the intake side is rotten.

 

[Malleus]

Temp sensor part number

I've spent considerable amount of time trying to find this part number, and I now concede defeat. lol I'm sure it's here somewhere... Can someone provide the name or part number for this sensor? Thank you!

forum.ih8mud.com

View attachment 2918575

The ECT sensor which I bought new, IIRC, came with the washer. The others, which I also bought new from T, came with loctite on the threads.

Many, many thanks! I still can't find that on any parts diagram. PartSouq lists it as

SENSOR, DIESEL ENGINE WATER TEMPERATURE​

for some odd reason. Now all I have to find is the harness connector housing

 

[COYS]

Many, many thanks! I still can't find that on any parts diagram. PartSouq lists it as

SENSOR, DIESEL ENGINE WATER TEMPERATURE​

for some odd reason. Now all I have to find is the harness connector housing

You're always so helpful, good to pay ya back. I'm clueless on the connector as I just used a new engine wire harness as part of my long block build.

Big ups to @flintknapper for the most excellent visual. Good luck.

 

[PIP]

Temp sensor part number

I've spent considerable amount of time trying to find this part number, and I now concede defeat. lol I'm sure it's here somewhere... Can someone provide the name or part number for this sensor? Thank you!

forum.ih8mud.com

View attachment 2918575

The ECT sensor which I bought new, IIRC, came with the washer. The others, which I also bought new from T, came with loctite on the threads.

I got a close up look at the ECT sensors recently and the gauge sensor and AC cutout switch seal into the head on a taper that is below the threads. Ingenious design. The ECT sensor for the ECM seals on the surface with a washer. I can only surmise Toyota did this to prevent mixing them up?

 

[Malleus]

I got a close up look at the ECT sensors recently and the gauge sensor and AC cutout switch seal into the head on a taper that is below the threads. Ingenious design. The ECT sensor for the ECM seals on the surface with a washer. I can only surmise Toyota did this to prevent mixing them up?

That's my guess, too, but IMHO, it was much ado about nothing. There's no magic in those switches.

 

[Malleus]

Here's a little nugget (post #5649) that will hopefully help someone else:

I either managed to destroy the ECT gauge sensor (83420-16040) harness connector housing, or it just rotted in place and waited for me to pull the head until it STB. At any rate, I need a new one. Fortunately, they still appear to be available (MTF on that): 90980-11428. Oddly enough, you can get aftermarket connector housings for the ECT sensor (89422-35010), which is a two terminal housing, but not the other, which is a one terminal housing.