| Message |
I don't have an official document outlining ECU modes, but I can analyze the ECU source code to determine what it does. O2 feedback is by far the most complex aspect of this ECU, and there is still a lot more to figure out, but what I can say is that it DOES calculate O2 feedback fuel trims just for idle. Exactly how/when it uses the idle fuel trim is still unclear so I'll have to get back to you on that.
PRVR operation is quite simple, the ECU activates the solenoid under the following conditions:
1.) Fuel temperature at engine start is greater than 75C
2.) Less than 30 seconds has elapsed since engine start
3.) RPM is less than 3000
4.) Engine Load (TP) is less than 40 (for 370cc injectors)
5.) There is no fuel-temp sensor error code The ECU can also use engine-start coolant temp. instead of fuel temp. to control PRVR, but doesn't in the factory tune.
Sam
|
 |
