Need some quick help with wiring and more(time sensitive)
- Thread starter IwantMKIII
- Start date
The TEWD ('89) shows the brown w/ red stripe wire to power and the red w/ blue stripe to the ECU...these are for the O2 heater. The TEWD shows a white wire for the O2 input to the ECU.
Doesn't matter as long as you get the signal one right. After all it's just a resistance heater. If you want to know for sure which is the harness side signal measure it to the diag block. It'll share continuity with the OX terminal....
this is a pre89 btw. The OX signal is a brown wire...so im guessing the other two are not polarity dependent according to jj's statement
ok im lost
what would cause an engine to suddenly lean out. Were talking towards 21 AFR's unless i press on the gas. Other times itgoes to 15ish then goes back up to 21.
I see no fuel leaks, hear no misses (well when i hit the throttle), have fuel pressure. Im at a loss here
Can someone please verify the brown wire is the OX signal? My narrowband gauge is tapped into it but its not reading anything as well, even when the wideband was simulating.
what would cause an engine to suddenly lean out. Were talking towards 21 AFR's unless i press on the gas. Other times itgoes to 15ish then goes back up to 21.
I see no fuel leaks, hear no misses (well when i hit the throttle), have fuel pressure. Im at a loss here
Can someone please verify the brown wire is the OX signal? My narrowband gauge is tapped into it but its not reading anything as well, even when the wideband was simulating.
'88 GTE OX is labeled as being white in the '88 TEWD. You should only see the AFRs hit the 20's when you're coasting in gear... then the ECU cuts the injectors.
CRE;1069591 said:
can you please post location at ECU, be specific as according to what i read it should be brown and is brown where the harness ox connector is
Look at the pinout in the last diagram on the following page for the pre89 GTE TCCS.
http://www.fadingworld.com/Supra/Electrical/MAFT%20Pro/MAFTwriteup/WiringDiagrams.html
http://www.fadingworld.com/Supra/Electrical/MAFT%20Pro/MAFTwriteup/WiringDiagrams.html
^shit damn fuck,
looked at it upside down when i wired it
I simulated a narrowband voltage to this brown plug.....did i screw up the ECU???
looked at it upside down when i wired it
I simulated a narrowband voltage to this brown plug.....did i screw up the ECU???
just changed it, still doing the same thing, think maybe i burned out the internal ground or something?
can i cut and ground the terminal externally?
can i cut and ground the terminal externally?
For some reason i would think it would be more likely that you would have killed the LC-1's output then to kill the ECU's sensor ground by feeding it a 0 to 1v signal... Test the LC-1's output and test E2 against +B and then against VC. Against +B you should see >11v, against VC you should see ~4.8v. The narrowband output from the LC-1 should move around between 0v and 1v, in the open air it'll be closer to .1v.
Ground the incoming E2 line to the chasis? Errr.... only if I were stuck in the desert. I don't see why it wouldn't get you home... but personally I'd find another way until I knew exactly what you f#$ked up. I wouldn't boost or anything if did try it though. There is liable to be a voltage offset so sensor readings could be skewed a fair amount.
JJ's probably the one you should ask about this.
Did you have anything patched into the O2 wire? Just making sure you weren't dumping the power from the heater circuit into it or something.
Ground the incoming E2 line to the chasis? Errr.... only if I were stuck in the desert. I don't see why it wouldn't get you home... but personally I'd find another way until I knew exactly what you f#$ked up. I wouldn't boost or anything if did try it though. There is liable to be a voltage offset so sensor readings could be skewed a fair amount.
JJ's probably the one you should ask about this.
Did you have anything patched into the O2 wire? Just making sure you weren't dumping the power from the heater circuit into it or something.
CRE;1069618 said:
voltage was only applied to the E2. I rehooked the o2 properly and is now working. Ill be checking for bad tears in a coupler quick cause i overlooked that.
Im officially the dummy of the night.......popped a pipe clear off. Didn't notice it b/c it appeared okay resting up against the coupler
Well, and on the upside you've got system rewired so it'll actually be able to do it's job! Woot!