Has any one got a pin out for the LJ78 ECU 175800-1070-12volt.

In particular looking for the pins that the THW sensor ( water temp Sensor)
connect to at ECU.

Regards

 

http://www.toyotadiesel.com/forums/s...ead.php?t=3313

Is this it?

 

Thanks that is a start.
and his findings for the THW sensor concure but then he could be working with an ecu different than mine. 175800-1070-12Volt.
I wonder which ecu part number he was working with that thread is 2005

What I'm looking for is the TWH wiring colour code or ECU pin out of where it connects on my ECU.
SO I can test the water temp sensor. It's a very difficult item to get at in the LJ78.

 

Oh shoot didn't see the second page.

Thanks again I'll keep on with my hunt.
If any one can help please do..

I guess I'l lhave to go get the ecu part number maybe that will make it easier for every one.

Regards

 

Ok was our in the dash after work.
Here is my ECU PART NUMBER 89661- 60111 this was hard to read.
Also the ECU is labeled 2L-TE A/T
PLUGS are 26 16 and 12
and again these numbers under the part num. 175800-1070-12volt.

If any one can help????
It would be great.

Richard

 

OK
I had tested the sensor from the wire harness plugged into the ECU.
and found that as the sensor was cold it went out of spec. there for hard starts on cold mornings and especially in the winter. As it was heated and up to running temp went within spec..

I just wanted to verify things before I cut into the wire harness..
We I received some info from all the major boards on the internet as I tried to ask the same question on each.

Mainly pin out and colour code of the wires feeding the sensor..

We last night I pulled the battery leads off the battery, pulled the 26 pin plug out of the ECU got hold of that pesky (red and White wire in my truck) THW sensor feed wire ...I then proceeded to cut it. That's right I cut it stripped and tinned the ends. My wire harness is no longer virgin..
I then wired in a variable resistor, mounted the knob in the dash..

Results -- Fixed my cold start issue. dial in high resistance for first start of day.. tells the ECU to fuel more and away I go. As It warms up dial out the extra resistance.

As long as there is continuity in the sensor this can be applied.
If the sensor is open this will not work.

Thanks to all that gave me some badly needed help.
This has been a persistent problem for me since last winter.
Tried a lot of things..Tested just about every testable sensor on the truck & the best thing of all Learned so much along the way.

Regards