The ECM opens and closes the throttle valve using a rotary solenoid type actuator. Due to opening and closing the valve, the exhaust gas recirculation volume can be properly controlled. Also, engine vibration and noise will be reduced by closing the valve when the engine is stopped.

The EGR valve position sensor is mounted on the EGR valve and used for detecting the lift amount of the valve. The lift amount detected by the sensor is provided to the ECM as feedback. The ECM then regulates the lift amount of the valve in accordance with engine running conditions.

The A/F sensor has the characteristic of providing output voltage which is proportional to the existing air- fuel ratio. The A/F sensor output voltage (*1) is used to provide the ECM with feedback to control the air-fuel ratio.

The EGR system recirculates exhaust gases, in order to suit every driving condition. The recirculated gas mingles with the intake air, therefore the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emissions.

In order to increase EGR circulation efficiency, the ECM adjusts the lift amount of the EGR valve and intake shutter valve angle (throttle valve).

The camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil.

The G signal plate (timing sprocket) has one tooth on its outer circumference and is installed on the camshaft timing chain gear. When the timing gear rotates, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field that generate a voltage in the pickup coil.

To detect atmospheric pressure, the built-in atmospheric pressure sensor in the ECM is used for 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 in order to optimize engine combustion.

Disconnect the E81 sensor connector.

The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. Since this sensor is electronically controlled with Hall-effect elements, accurate control and reliability can be obtained. It has 2 sensors to detect both the accelerator position and a malfunction of the accelerator position sensor.

Connect the intelligent tester to the DLC3.

The EDU has been adopted to drive the injectors at high speeds. The EDU delivers high-speed drive signals under highly-pressurized fuel conditions using the DC/DC converter, which provides a high-voltage and quick-charging system.

Soon after the EDU receives an injection command (IJt) signal from the ECM, the EDU responds to the command with an injector injection confirmation (IJf) signal when the current is applied to the injector.