MAF ISC TRIM) __________________________________________ (range not available) Indicates the amount of air that bypasses the throttle at idle. The motor that drives the IAC valve returns a value of 0 to 255 to the ECM. The ECM then converts this value into an airflow value as a percentage of the total airflow.
125 Data Parameters Gas Engine Parameters MAF-SENSOR(V) ___________________________________________ (range not available) Indicates the actual voltage signal from the Mass Air Flow (MAF) sensor. This voltage is used by the ECM to calculate the maximum amount of air being drawn into the engine. MAF TRIM(g/s) _____________________________________________ (range not available) Indicates the amount of extra air mass required to keep the engine idle speed correct when a change in load occurs, such as when the air conditioning or the rear heater is switched on.