The fuel temperature sensor monitors the fuel temperature. The fuel temperature sensor has a thermistor that varies its resistance depending on the fuel temperature. When the fuel temperature is low, the resistance of the thermistor is high. When the temperature is high, the resistance is low. The variations of resistance are communicated to the ECM as changes of voltage (See Fig. 1).

Refer to DTC P0545 ().

Refer to DTC P0548 ().

The throttle position sensor is mounted on the diesel throttle body assembly and detects the opening angle of the throttle valve. This sensor is an electronic sensor and uses Hall-effect elements.

Refer to DTC P007C ().

Refer to DTC P0112 ().

A thermistor is built into the engine coolant temperature sensor and it changes its resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as that of the intake air temperature sensor.

The exhaust fuel addition injector assembly is mounted on the exhaust port of the cylinder head, and low pressure fuel is supplied to the exhaust fuel addition injector assembly by the feed pump in the fuel supply pump assembly. This exhaust fuel addition injector assembly adds fuel in response to a control signal from the ECM, in order to perform PM forced regeneration.

A thermistor is built into the engine coolant temperature sensor and it changes its resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as that of the intake air temperature sensor.

The intake air temperature sensor is built into the mass air flow meter and detects the intake air temperature.

A thermistor built into the sensor changes its resistance value according to the intake air temperature.

The lower the intake air temperature, the higher the thermistor resistance value. The higher the intake air temperature, the lower the thermistor resistance value (See Fig. 1).

The ECM reduces injector assembly operation speed and applied voltage to the injector assembly to reduce the sound it produces during idling. To do this, the ECM outputs applied voltage switching signals to terminal IJEN of the injector driver from terminal IDLO and IDL2 of the ECM.

The manifold absolute pressure sensor detects the intake manifold pressure. The ECM determines the basic injection volume and injection advance timing based on the voltage output by the manifold absolute pressure sensor.

The manifold absolute pressure sensor monitors the absolute pressure inside the intake manifold (default is 0 kPa [0 mmHg, 0 in.Hg]). As a result, the ECM controls the air-fuel ratio so that it reaches the proper level under any driving conditions.