I found a cartridge and the toyota cable by themselves for $25 each now... but the cable has a round end. It looks like the round end might unplug to reveal a square plug behind the round one, some sort of dual-fit setup, but I can't tell. OTC's website says it fits these cars:
Lexus-Engine ’90–’93
Camry-Engine ’92–’94
Cressida-Engine ’89–’92
Lexus ’90–’93
MR2 ’85–’91
Cressida ’83–’92
Supra ’83–’91
Camry ’83–’94
Celica ’85–’91
Corolla ’85–’91
Starlet ’83–’84
Truck ’85–’91
4Runner ’91
Van ’90
Does anyone know if the stock diagnostics plug on any of these look the same as the 23pin one on the Soarer 1J harness? I'll check out my 87' 7M harness tomorrow, along with my mom's 94' Camry. I think I also have a 90' Corolla harness laying around.
I also found some interesting reading related to this, which explains my whole reasons for trying to read the fuel trims... for anyone who isn't sure what I'm talking about or why I'm bothering with this. This is an old toyota file I dug up on google....
http://www.autoshop101.com/forms/h48.pdf
Looking at this info... maybe I
could build my own datalogger for this car. :naughty:
It even states that on models that have no serial datastream there's a voltage output that corresponds to the LTFT on the VF1 pin in the DLC.
That would be sweet.... you basically can tune your part throttle using nothing but a freaking volt meter as a gauge to see the LTFT in the ECU. That is.. if this ECU has no serial datastream of course... if it does you'd need a cable and a scan tool. If the ability is there though... chances are the OTC tool can read it.
From the info I found before, the absence of a pin in TE2 probably indicates that there's no serial datastream available.... which means it's as simple as using a volt meter to read the output of VF1. There's a note in one of the charts about TE1 being "off" while doing this. I'm assuming that TE1 is "off" by default, and that either grounding or putting power to TE1 would be turning it "on". It says that turning TE1 "on" and negating "IDL/CTP" (which I'm translating to "opening the throttle above idle/closed throttle position") would then cause VF1 to display an indication of whether the car is in closed loop or open loop mode.
This would make an awesome display gauge for the dash... one that displays fuel trim, and with the flip of a switch, also displays fuel system loop status.
I'm gonna check this all out tomorrow. I wonder what other stuff can be read from the DLC?
