I'm contemplating using an Auto-Tps on the emu .. need some help :)

Texx

Texx

Super Moderator
Just a thought, but could you use one of the sub injector channels? Set it to 'relay' and have it pull the PSW signal to ground, only thing being is that I can't tell if the sub injector channels in 'relay' mode can be configured to activate at a set throttle position? If they can then connecting the PSW terminal of the stock ECU to one of the EMU sub injector channels, setting the channel to 'relay' and configuring it to activate at 85% throttle position will do the same job as the manual TPS. The voltage output of the auto tps can be wired to the EMU only and the idle switch used as normal.
 
dark_knight

dark_knight

Member +
I got the variable TPS but haven't tried the setup (on the road) as shared by Texx yet. I was able to get the EMU to get the variable feedback it needs though. I'm not sure if the stock ECU was getting the necessary signals. I'm yet to run more conclusive tests as I have everything I need, everything but the time to test.. :)
 
dark_knight

dark_knight

Member +
4-Pin Variable TPS on MT Setup

So fellaz.. I am living proof that life indeed does happen and we forget to come back here to share the ideas and findings we get on topics such as this.. :)
We get too busy or lazy and just give up on being consistent here.. :D

Speeches aside, I have a small update. I managed to iron out more of the quagmire and here's how. Please note this is applicable to the EMU configuration which I'm running at the moment. I'm sure it can be copied across similar setups.
First off, you will need some things;

  • Diodes, x2 pieces
  • NO automotive relay
  • Soldering gun, solder, shrink-wrap etc
  • Multimeter
  • Loads of patience

What I did was;

  1. Identify the VCC feed to the MAPS and splice into it. Use enough wire to neatly reach the TPS area and tape everything off securely. You could also tap it from the ECU side. Whichever is easier for you
  2. Extend the TPS wires (not necessary but recommended).
  3. Solder the diodes on the VCC and IDL wires with the gate facing the TPS, meaning current will only be allowed to flow to the TPS. This is to prevent unwanted voltage feedback as the TPS operates.
  4. Connect the VCC feed to Pin #1, E2 to Pin #4 and IDL to Pin #3 (Pins on the TPS).
  5. Ignore the VTA/PSW feed on the harness.. or, as in my case, I used the existing wiring to feed the EMU TPS feedback wire instead of running fresh cabling.
  6. On the ECU side, I then used a fresh connector pin to connect Pin#10 (PSW) on the 16-pin plug to the relay. It needs to be a NO (Normally Open) relay in order to only bridge the link once the EMU is configured to do so.
  7. You can use either the VTEC/NVCS configs on the EMU to the trigger the relay when throttle input is at 65/70% and this will then trip the PSW feed at the relay to ground, which will then give the ECU the correct pedal information. This is the phase I'm currently at and haven't tried it hands-on but the theory makes sense and I'm sure it will work.

Short of drawing up a diagram, here's the look of things after it's all said and done.

Harness Side ---------------- TPS Side
VCC --------- >| ----- (diode) Pin#1
E2/GND ----------------------- Pin#4
IDL ---------- >| ----- (diode) Pin#3
EMU --------------------------- Pin#2 (to give variable throttle feedback)

Planning on a rolling road session so everything needs to be tip-top as I especially want to set up an acceleration map.. :cool:
 
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