Just to keep you updated guys :
This winter, I redid my engine wiring harness. The car runs well, but I cannot get the following things to work :
-IAC valve : I have the PWM mod done to my v3.0 MSII board and I can modulate the valve opening while idling, but even when it's set to 100% PWM (0% = fully open), the valve isn't shut totally. I tried to add a 40 ohms, 50 watts resistor on the RSC pin. The lowest idle speed I was able to reach was 1500 RPM with the throttle body screw removed (lowest throttle body screw setting possible). So, I came to the conclusion that my IAC isn't the same as other 3SGTE gens IAC and cannot be fully closed by the MSII. So, I run a 1200 idle for now and I tuned warm-up enrichment so I can idle the car without IAC even on cold mornings.
-Electric fan control : I used the JS2 pin (IAC2A port) to trigger an automotive relay to run a spal rad fan. I want it to be set like this :
1-when the coolant temp is higher than 200°F with a 5°F hysteresis
AND
2-when the engine's RPM is higher than 600 RPM (to not start the fan when cranking).
I've set the port to PT7 (IAC2A = JS2)
Power-on value = 0
Triggered value =1
I've wired the JS2 port directly to the pin 85 (- coil side) of my relay exactly like this diagram minus the transistor, diode and resistor because I'm running it directly :
http://www.megamanual.com/ms2/SpareCircuit.gif
Now, the problem is that when the MS-II is plugged in my wiring harness, the JS2 pin is grounded automatically (the key is not even at ACC or ON position, the ECU is completely off). This means that the fan will run when the car is off. And when the ECU is on (key is siwtched to ON position), it's no more grounded, but I got continuity between battery + and this JS2 wire...
What did I do wrong... I'm supposed to received ground from this JS2 pin when the spare output is triggered on which means that the conditions are met (coolant > 200°F and RPM > 600 RPM).
Let me know if you have any ideas. Forget about the IAC problem, I'll simply run no idle control for now until I can afford a kind of PWM industrial in-line air valve.
Thanks
Sam