The plug for my AFM (7mgte) was cut off. I know where the wires are suppose to go in the plug but there are two brown wires. I do not know which brown wire goes where. Can anyone tell me which brown wire goes where?
AFM Plug Wire Locations
- Thread starter closetnerd
- Start date
ill look on mine tommorow in the daylight, but i dont think it really matters iirc, the brown are just ground wires so i dont think it will matter if you hook them up wrong
edit: ok im looking at the tsrm....they are grounds but they do seem to matter. ill trace them and be sure. one goes to the check connector at E1 the other goes to like 4 other systems and the tccs.
edit: ok im looking at the tsrm....they are grounds but they do seem to matter. ill trace them and be sure. one goes to the check connector at E1 the other goes to like 4 other systems and the tccs.
Last edited:
They're not the same grounds. One is chassis ground while the other is sensor ground. Not that it matters...much 
I know this is an old thread, but is it alright for both the karman vortex unit and the air temp sensor to be grounded to the ECU sensor ground (pin E2)? I suppose it wouldn't be a problem but then again, Toyota ran two different grounds, probably for a particular reason that I can't think of.
K thanks JJ. Any idea why the AFM is chassis grounded? Either there's a lot more going on in there than the schematic illustrates or I just don't understand how it works. It looks as if vref comes in, goes through a diode, then goes strait to ground, without anything else using the vref.
Last edited:
Ks is a digital signal, and any good designer will be careful to keep his analog grounds separate from the noisy digital grounds. Treat the "schematic" shown on the symbol as notional, it does not represent in any true way what is going on.
Intuitively I would think the battery/chassis ground would be more noisy than the E2 sensor ground, is this incorrect? Do you think it is important to keep them separate or would it make a negligible difference?
That is correct E1 is noisier than E2. The analog THA signal is referenced to the clean E2 ground. The digital Ks AFM signal is referenced to the noisier E1, since Ks has a much higher noise margin.
Ah thanks, I just re read your first post and I had read it backwards for some reason, that makes sense.
Basic stuff, although way before they learned about cars the Japanese learned a thing or two about electronics.
