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control logic 700 1987

posted by  someone claiming to be j on  Wed Dec 10 09:56 CST 2003 [RELATED]

The FI ECU compares the resistance value recieved from the ECU Temp sensor to values hardcoded into memory and then provides the appropriate pulses (not static voltage)to the IAC to increase RPM as well as increasing the pulse to the fuel injectors to enrichen the fuel/air mixture.Also note that the ignition ECU adjusts the timing for cold vs hot temperature from the same sensor.
I don't believe that the ECU uses the O2 sensor to very the fuel injection when cold since they are inoperable until they are at temperature.

Hope this will help in your quest for understanding.
Joe






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New control logic [700][1987]
posted by  ronald subscriber  on Wed Dec 10 04:33 CST 2003 >


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