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ENGINE CONTROL SYSTEM EC-571 [QG (WITHOUT EURO-OBD)] C D E F G H I J K L M A EC SYSTEM DESCRIPTION The ignition timing is controlled by the ECM to maintain the best air- ° BTDC During the following conditions, the ignition timing is revised by the ● At starting ● During warm-up ● At idle ● At low battery voltage ● During acceleration The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed Air Conditioning Cut Control EBS00QUT INPUT/OUTPUT SIGNAL CHART *1: These signals are sent to the ECM through CAN communication line. SYSTEM DESCRIPTION This system improves engine operation when the air conditioner is used. ● When the accelerator pedal is fully depressed. ● When cranking the engine. ● At high engine speeds. ● When the engine coolant temperature becomes excessively high. ● When operating power steering during low engine speed or low vehicle speed. ● When engine speed is excessively low. ● When refrigerant pressure is excessively low or high. SEF742M Sensor Input Signal to ECM ECM function Actuator Air conditioner switch *1 Air conditioner “ON” signal Air conditioner Air conditioner relay Throttle position sensor Throttle valve opening angle Crankshaft position sensor (POS) Engine speed *2 Engine coolant temperature sensor Engine coolant temperature Battery Battery voltage *2 Refrigerant pressure sensor Refrigerant pressure Power steering pressure sensor Power steering operation Vehicle speed signal *1 Vehicle speed |