A442F controller pins functions. (1 Viewer)

[jimbote]

Planning a 14bt diesel swap into my very rough and ugly fjz. This is a super low budget build, so keeping the stock TCM is paramount. I have the FSM, along with the diagrams. By reading the diag flow charts, I've put together the functions of most of the pins. The three that are not giving up their secrets are ESA1,2, and 3, between the ECM and the TCM. Anyone have insight on these?

 

[Malleus]

I believe those are the signal inputs that "connect" the engine and transmission control logic. How you actually use them is a mystery to me.

 

[Malleus]

If you have a TCM map, I'd be very grateful if you'd share it. It would save me the trouble of combing through the EWD and putting a single view map together.

 

[jimbote]

The wiring diagram manual describes operation as using four ECM inputs to pins 5,6,7,13 on the TCM as well as a dedicated speed sensor to pin 4 on the TCM.
These inputs, as far as i can tell;
#5: NE, pulsed engine speed signal (three per rev?)
#6: IDL, throttle sensor, 0-3v closed, 9-14v w.o.t. I imagine this is an ascending voltage from 0-14
#7 VA, also a throttle sensor circuit, closed= 3.5 to 4.5v, open=2.5 to 3.5
#13 ECT2, fail safe signal? @ 176°F 2-3v

 

[Malleus]

I was hoping to gather all this into one image:

#5 is either three or four, I cant' remember how many lobes the spinner has on it right now.
#13 is the shift map switch position; along with #2 switches from normal (ECT1) to sport (ECT2) (my terms). Same as the PWR switch on the 3rd gen 80 series.

 

[jimbote]

I was hoping to gather all this into one image:
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#5 is either three or four, I cant' remember how many lobes the spinner has on it right now.
#13 is the shift map switch position; along with #2 switches from normal (ECT1) to sport (ECT2) (my terms). Same as the PWR swtich on the 3rd gen 80 series.

Ok, on #13, i don't think my 93' has a sport mode for the trans? Or does it?

 

[Malleus]

 

[Malleus]

Ok, on #13, i don't think my 93' has a sport mode for the trans? Or does it?

That's what the ECT button on the dash does. It's a pattern select switch. There are two, which I haven't found rpm/speed tables for, but when it's pushed in the shift points are later than when it's out. You're farther down the HP/T curve.

 

[jimbote]

That's what the ECT button on the dash does. It's a pattern select switch. There are two, which I haven't found rpm/speed tables for, but when it's pushed in the shift points are later than when it's out. You're farther down the HP/T curve.

Ok, got it, and now I see it in the diagrams.

 

[Malleus]

Now you see why I was hoping for a single image...

 

[Malleus]

FWIW, this post about Haltech control of the A442F may have some useful information in it. I haven't read it. Yet.

 

[jimbote]

FWIW, this post about Haltech control of the A442F may have some useful information in it. I haven't read it. Yet.

Are you attempting a similar swap?

 

[Malleus]

No, just documenting an A442F I'm rebuilding. I'm a sucker for rabbit holes.

 

[jimbote]

Very cool. More info is better. Below, is from the thread you linked . I think what i'll do is depin one wire at a time in order of perceived redundancy, then drive and take notes.

 

[Malleus]

That thread is a wealth of good to know stuff.

 

[ToyotaDon]

According to the System Outline that is part of the Engine Control wiring diagram, ESA stands for Electronic Spark Advance. It is not clear how this affects transmission operation, or why three separate circuits are needed, but your diesel engine will not be using this system and it appears the transmission control does not "need" this info.

 

[jimbote]

According to the System Outline that is part of the Engine Control wiring diagram, ESA stands for Electronic Spark Advance. It is not clear how this affects transmission operation, or why three separate circuits are needed, but your diesel engine will not be using this system and it appears the transmission control does not "need" this info.

Thanks. I'll also do some testing on the various outputs from the ecm to tcm while the 1FZ is still in the truck.