1A-4 Engine Control System Function and Operation Electronic Control System The electronic control system processes the data, which has been collected with various types of sensors, by means of the control program installed to ECM (engine control module) to totally control engine parameters such as fuel injection amount, injection timing, engine startup, altitude compensation, and EGR. ECM ECM Description Function of ECM ECM supplies 5 V and 12 V voltages to various sensors and switches. Since powers are supplied via high resistances in ECM, Test Light, even when connected to the circuit, will not be lit.
In a special case, a normal voltmeter does not indicate correct values since the resistance of the instrument is too low. To get accurate readings, you need a digital voltmeter whose input impedance is at least 10 M Ω . The special tool 5-8840- 0366-0 is a proper choice for this measurement. In the ECM, the output circuit is controlled by regulating the The ECM is mounted in the glove box. The ECM monitors various data sent from diversified sensors and controls systems in the powertrain. The ECM diagnoses these systems to detect faults with respect to system operations and inform the driver of faulty condition via the CHECK ENGINE Lamp (MIL) and stores DTCs (diagnostic trouble codes).
DTC identifies the trouble generation area to aid repairs by service operators.
Sensor ECM Actuator Control Engine Rotating Speed Fuel Injection Volume Engine Driver Unit (Built-in Injection Pump) Control Fuel Injection Timing Crankshaft Position Injection Pump Control Idle Rotating Speed Control Spill Control Valve Accelerator Position Starting Control Timing Control Valve Coolant Temperature Altitude Control Fuel Temperature (Built-in Injection Pump) EGR Valve EGR Control Engine Control Module Intake Air Throttle Intake Throttle Valve Intake Air Pressure Control Exhaust Magnetic Valve Exhaust Brake Control Vehicle Speed Warm-Up System Glow Plug Control Idle Up Volume Glow Lamp Starting Aid Control Intake Air Temperature CHECK ENGINE Lamp Self Diagnosis Atmospheric Pressure Swirl Change-Over Valve Intake Air Swirl Control (Built-in ECU) LNW21ALF000301-X