22RE Air/Fuel ratio test
#1
22RE Air/Fuel ratio test
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
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
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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.
This one is BR
This one is Left to right R,W, LG-R I think this one is the Green Circle.
Last edited by Terrys87; 03-19-2015 at 08:19 PM.
#4
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?
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?
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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?
Last edited by UGR; 09-18-2018 at 10:50 AM.
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Once you get to about 1992, the ECU emits a data stream on TE2 when properly triggered. But not on older trucks.
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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?
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?
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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.
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.
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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!
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.
Last edited by UGR; 09-18-2018 at 02:05 PM.
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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..)
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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..)
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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.
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
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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..)
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!
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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
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
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