[CJMR2T]

Nope, no CSI (Cold Start Injector) on the Gen 3. With the Gen 3 engines toyota just batch fires the injectors during cranking to for cold start inrichment. This actually works better then a CSI setup.

As for the problem, have you checked the coolant temp sensor and its associated wiring? The ECU relies heavily on it for fuel correction, timing correction and idle control. Its also possible for there to be an issue with the sensor but not cause any code to appear.

As for some "idle control module" under the dash, there is no such think.

 

[CJMR2T]

Not exactly like our MR2 version but pretty close. The section EG-166 under TB has method to adjust diaphram for idle or can roatate TPS which I've always been told not to touch on a gen 2. Anyone game?

http://www.celicatech.com/bgbonline/94_205_engine/EG/EG.htm

No electrical schematics on idle control.

The MR2 Gen 3's dont have the Throttle opener assembly (diaphram that you are refering to) so nothing to adjust there. The TPS should be check with the .50mm and .90mm feeler gauges while check for continuity between IDL and E2 as suggested in the BGB. Basically you want make sure that there is continuity with the .50mm feeler installed between the throttle linkage and throttle stop screw and no continuity with the .90mm feeler installed.

If checking it reveals that it doesn't match the above, then you want to insert a .70mm feeler and adjust the TPS just to the point that it has continuity between IDL and E2 and lock it down. If you got it right, in will pass as mentioned above, continuity with the .50mm feeler and no continuity with the .90mm.

It also wouldn't be a bad idea to pull the EFI fuse to reset the ECU and allow it to relearn the idle characteristics of the engine and IACV.

 

[CJMR2T]

Oh, one other thing, does the engine actually seem like its idling low? Have you checked the idle speed with a good external tach of some sort?

I say this cause its possible that your dash tach is off if thats what you're going by.