Glossary of ECU Function Abbreviations from the General Wiring Diagram/FSM

This is cross posted in another thread but thought I would ask here, too, for the exposure.

Can anyone here point me to a glossary of Toyota ECU function abbreviations? I'm looking at the general wiring diagrams and ECU pinouts from a FSM but would like to know what their abbreviated functions mean as it will help with my motor install/ECU conversion on my 3RZ and Google ain't it this morning.

I think I've found the others but I can't figure out SIL, NSW, and SDL. Thank you in advance!

This isn't all of them but an example of the diagram I'm working from:
Some are self-explanatory (BATT, +B) but can't find the ones I've bolded. Thanks again!

 

nsw = neutral safety switch
The other 2 im not sure. Every pinout diagram Iv'e seen doesn't have a description for sil or sdl, just where they lead.

 

NSW is gona be Neutral Switch (A/T only).

SIL is the K-Line for scan tool communication to the DLC.

I'm not finding SDL on the diagrams.

 

Awesome! NSW makes sense. Thank you! One more puzzle piece.

SIL is present on the 2000 ECU and not on the 95.5 cab (which I think uses OBDI so that makes sense). Can the 2000 ECU run without it AKA can I omit it? Might have to try and see

SDL is present on the 95.5 ECU and is a bigger gauge white wire. Maybe it has to do with the scan comms too since SIL is also the white wire on the 2000 ECU? IDK just spit balling

 

Oh ok, I wasn't sure what the deal was and what particular vehicles we are looking at here.

Going back to a 95 Tacoma SDL is also a communication line to the DLC.

While you can run without the K-line you won't be able to talk to the ECM with a scan tool.

 

The 95.5 cab wire harness is so hacked up by someone in the past, I'm not sure that's even possible anyway. But the ECU, sensors, engine wire harness, etc is all complete out of a 2000 4Runner so I might be close with a little cab harness work. I'm dumb here so I'll ask again: would you butt cab harness SDL (white) into 4Runner ECU SIL circuit (white) or will that require a little more digging?

 

Apologies I haven't been following any of your other threads but we are putting a 2000 4runner engine and ECM in a 95.5 what? Tacoma or another 4runner?

 

That is correct. I purchased a 95.5 Tacoma that had the distributor 3RZ removed at some point in its past in place of a dual coil 3RZ. The dual coil motor blew the head gasket and the owner fire-sold the Tacoma to me. I should have spent more time pulling the dash apart to see why the OBD scanner was erroring out but found the culprit after I got it home; a hack job cab harness (to attach the dual coil ECU). So I set out to find a new motor and found a deal on a 2000 4Runner coil pack 3RZ with all sorts of complete goodies, including wire harnesses and the deal was just too good to pass on. Now I've got the 4Runner 3RZ installed and ready to go with one wiring harness to clean up and sort out and that's where I am.

 

Ok so yea you should be able to just hook the SIL circuit of the 4runner ECM to the SDL circuit on the 95 Tacoma, it's only used for scan tool communication.
You would need to move the pin at the DLC from pin 2 to pin 7 and id the truck as a 2000 4runner for the scanner to talk to it though.

 

Perfect! You got me sorted. Now just need to wait for new terminals so that all the wire colors are un-soldiered and intuitive for the next owner. Thanks again!

 

Gonna bump this thread. The 3RZ turns over but doesn't fire.

I've got the majority of connector E8 rewired but am having a hard time figuring out and finding out what the ELS function (E8-Pin 20, orange wire) is for. It looks like it's present on both auto and manual tranny 4Runner's. Looking at the connector/cab wiring harness from the 2000 4Runner I have, the orange wire is clearly in place in pin 20.

The 1998 and 1995.5 Tacoma do not list ELS function on their ECU's pinouts and so it doesn't have an obvious wire to connect like most of the others on the truck. Can anyone tell me what ELS function/abbreviation is and what should I do with it? Terminate it? ground it? add 12v to it?





I'm operating off of the 1996-2002 FSM on TTORA's archives but don't see anything about "ELS" from the general wiring diagram. Kinda lost on this one!

 

Does ELS stand for Electric Load Sensor circuit? The ELS and corresponding pin on the ECU is also on 2000+ 3RZ Tacomas.

If that's the case, perhaps the orange ELS pin can get hooked up to 12v+ from the 95.5 wiring harness as the older trucks do not have the sensors to support the ELS function, right?

 

It's just electrical load sense, looks like it tells the ECM when the lights and/or rear defogger are on so it bumps the idle up slightly.

 

Did you ever figure out SDL?

Pretty sure it stands for Serial Data Link. another name for the obd connector under the dash

 

Thank you. I couldn't seem to find that diagram; just that it was 12v and had a connector downstream. Think I can omit it?

Awesome! SIL (2000 4Runner) and SDL (95.5 Tacoma) both have white wires going to similar pins on the ECU. SIL is comms for the OBD2 and figured SDL was similar. Thanks for posting to confirm that.