Saw a very well written response to a post on installing a broadband O2 sensor and A/F meter a while back. In which the responder mentioned Measuring the voltage reading to ECU from O2 sensor. The FSM says use SST 09842-14010 to do so.

So my question is does anyone have the pin out of the service connector? The one circled in green.


*** thank you 4crawler for the posted image.

Thanks,
Scott

 

Those are 85/86 connecotrs. I have an 85 FSM. I am blind as a bat but can you see the color code on this? I cant find my wifes glasses and I am still in denial of my eyesight.

This one is BR


This one is Left to right R,W, LG-R I think this one is the Green Circle.

 

I am not finding the "Service" connector in the FSM. Is that what it is called?

 

Someone liberated my hard copy of the FSM. But the my digital reference to the connect is FI-69 of the 85 FSM.

I apologize but looking through the wiring schematics on the digital copy is difficult and I didn't think of it till you post. But page 1 to 4 under EFI says test connector. Though it looks like only 2 leads coming off of it instead of the three physical wires at connector.

I'm I looking at the correct connector?

 

hey, I'm also trying to figure out the pinout of this connector. the instructions on checking the Ox sensor where the FSM says the voltage will "fluctuate" which makes me think there might be data sent over the connector. any idea? has anyone run this through a scope or logic analyser?

 

I don't have an '86, but the Ox1 connector on my truck goes straight to the O2 Sensor. There is no data. The O2 sensor is a "high-gain" oxygen sensor. With no oxygen, it produces about 0.9 volts, and as soon as it detects any oxygen at all it flips to about 0.1v. So, the ECU moves the injector open-time back and forth about 1/second to "find" the sweet spot -- no oxygen in the exhaust. That 1/second (8 times in 10 seconds) is the fluctuation you are looking for.

Once you get to about 1992, the ECU emits a data stream on TE2 when properly triggered. But not on older trucks.

 

Yeah, TE2 doesn't seem to exist on the ECM in the '85 FSM.. is this applicable for '86 and '87 as well? I only saw 1985 and 1988.

Do I basically have to build my own meter that ties into every single wire to read all of the data, then? or. forgive me if this is the dumbest thing you've ever heard as I am computer-proficient but car-stupid, but is it worth looking into putting a newer ECU into my truck?

 

Computer-proficient? I've got a 1985-vintage rotary-dial telephone. What do I have to do so I can watch Netflix movies on it?

I'm not sure what you really want to accomplish, but if you want your 33-year old truck to look and act like a new Tesla, you're going to need to do a lot more than replace the computer and run wires.

Having said that, your truck IS the pinnacle of 1980s technology. If you like studying that, then sure, run lots of wires and hook them up to an off-the-shelf data logger. It's actually quite interesting.

 

Well, first find yourself one of these....

You might need a serial-to-USB connector and a laptop... and maybe you'll be able to get 144p

Or just throw it all in the garbage and get a free cellphone out of the Best Buy e-cycle bin!


Tesla already said they would not sponsor my efforts when I dropped by and for the record I'm not trying to improve performance through chiptuning (to me chiptune means something more like this) or whatever, I just want to update my dash. Right now I have the old no-tach dash with an aftermarket tach ghetto-rigged to it and no trip odo. I read (am still reading, actually) this fantastic dash swap thread but I keep thinking to myself... "why not make it even better?"

Well, the hope is that I can build the off-the-shelf data logger... one of my plans is to just log the data indefinitely and have an "incident" button which would just put a timestamp in the log so I can look for inconsistencies in the data when I, say, hear a noise or have to stomp on the brakes for some reason or whatever. I am just a noob on the car side and have a pile of things to learn.

 

Yes you need to snoop each sensor, Toyota used an "SST" that went between the engine harness plugs if you tried hard enough you might be able to find one it had a serial output that was horrid slow (slow as in most people now a days can type faster with a single thumb..)

 

hmmmmmmmmmmmm for the sake of historical preservation or something like that -- or so that I can demonstrate how much cooler my solution is, if/when it works -- I would be interested in obtaining one. any idea what it would be? should I ask at a dealer? I think the serial output thing you're talking about is what this other dude learned to handshake with and it would save me a lot of time.

 

Nope not off hand just SST #, might be listed in the FSM section. Best bet is to dig through the toyota PDF's that were/are available on autoshop101 in the way back machine.

It wouldn't surprise me if you could find that "TE2" on the CPU board just not broken out to an external pin. The good news is you don't need a fancy scope, a modern logic sniffer is going to be plenty fast enough for the clock rate on these but you need to know quite a bit of electrical and computer engineering or an endless supply of ECU's

 

Not until about 1992; I think UGR is back in the 80s. I can't prove it (I don't have an '88), but I would be really surprised if Toyota built all the hardware to support TE2 and just hid it in earlier models.

The output is about 110baud (but not EXACTLY RS232), andit repeats about every 1.2 seconds. Plenty fast for the 90s, but not CAN-bus speed today.

I have a bluetooth-connected translater -- very cool!

 

Yep, I'm working with an '86.

I have code to read the TE2 interface if I need it.

I started a new thread for this because I think my needs are uh, a little bit different than everyone here even though my goal is similar. If anyone wants to jump in on that thread (or just watch with dismay) it's here: https://www.yotatech.com/forums/f98/.../#post52408403