MikePowers

Thanks for the replies people I did get plugs from RS, thanks for the tip. The car has been test started on the gen4 ecu, yes. We didn't run it for long as intakes, coolers etc are still being installed. With our lockdown it's hard to work on the car at the moment. The plan is to build this mini adapter loom so the stock ECU can still be used until we can get to the dyno for full mapping. Any issues and the stock ECU can go back on. A summer wire tuck project will then remove the gen4 loom and ECU, move the G4+ to the cabin and fully rewire the engine loom for that routing. This way the stock parts can be used for our other gen4 swap, or sold off.

thanks for the fast replies! Adamw. thank you, that's so simple. I had hoped it would work like that, cheers for confirming it. Ellisd1984. I could get some gen3 plugs and just repin it, can't take them off the old loom as they are in use in another project. should be easy enough to get hold of new plugs. Someone else told me there is already an off the shelf adapter mini loom which would be great too. thanks for the help.

Hi all, Please be gentle, this is my first time setting up an ECU. My car is an SW20 MR2, when I got the PNP ECU the car had a gen3 3sgte engine. However that engine was bad so we swapped it for a gen4 3sgte. They are very similar engines however there are some notable differences. Gen3 only has 3 plugs at the ecu, which fit directly into the Link G4. Gen3 uses a distributer and single coil. The gen4 has 4 plugs at the ecu, so will need to make a small conversion harness here. Gen4 uses CoP ignition with triggers from crank and cam sensors for timing. Otherwise the wiring setup and sensor setup is almost identical. I have pinouts for both the gen3 and gen4 stock ecu, also the Link g4. most of the pins in the mini conversion loom are simply just moving a single wire to the correct pin for the Link from the gen4 loom. The ecu is tst205+ with rev 1.5 pcb. with the extended input wiring also. Link map sensor, all other sensors are Toyota. My questions are: How do I change the pin/wire setup to fire direct ignition for the CoP instead of a single coil? Which of the timing triggers will the ECU use? Can it use both crank and cam and is there an advantage to using both? Which pins on the Link would be used for these timing triggers? I realise this isn't an ideal setup but with the ECU already here I have to work with what I have. The plan is to get some new connectors, one end with a female ecu plug for the gen4 loom and the other 3 male gen3 plugs to wire into the Link. The task is slightly simpler as Power Steering, Air Con and ABS have been removed, saving needing those connections. Also boost is controlled via a boost controller and not the stock VSV.