The ECM monitors the internal fuel pressure of the common rail using the fuel pressure sensor, and controls the suction control valve to regulate the internal pressure to the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip. This sensor outputs the voltage in proportion to the internal fuel pressure.

To detect atmospheric pressure, the atmospheric pressure sensor built into the ECM is used in the common rail system. Following the changes in the atmospheric pressure, the ECM corrects the fuel injection volume, timing and duration, and adjusts the common rail internal fuel pressure for optimizing combustion.

Check the E-VRV for turbocharger control .

The exhaust gas temperature sensors are installed before and after the DPNR (*1) catalytic converter to sense the exhaust gas temperature.

A thermistor built into the sensor changes its resistance value according to the exhaust gas temperature. The lower the exhaust gas temperature, the greater the thermistor resistance value. The higher the exhaust gas temperature, the lower the thermistor resistance value.

The battery thermometer sensor is installed on the battery cover to detect battery temperature.

A thermistor is integrated into the battery thermometer sensor, and the resistance of the battery thermometer sensor changes according to the battery temperature.

The resistance of the thermistor in the battery thermometer sensor decreases as the battery temperature increases. The resistance increases as the temperature decreases.

The characteristic of the A/F sensor is such that it provides an output voltage (*1) that is proportional to the air-fuel ratio that it is measuring. The A/F sensor output voltage is used as feedback to allow the ECM to control the A/F mixture.

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

Warm up the engine.

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

Turn the engine switch OFF.