GENERAL INFORMATION
System Block Diagram
Control System Diagram
List of Components and Functions
| Name |
Function |
|
| ECU |
Engine-ECU |
Effects control to actuate the actuators in accordance with the driving
conditions, based on the signals input by the sensors. |
| Sensors |
Ignition switch-IG |
Detects the ignition switch-IG ON/OFF signals. The engine-ECU turns
the engine control relay ON/OFF in accordance with these signals. |
| Ignition switch-ST |
Detect the ignition switch-ST ON/OFF signals. The engine-ECU turns
the starter relay ON/OFF in accordance with these signals. |
|
| Accelerator pedal position sensors (main and sub) |
Detects the position of the accelerator pedal and input it into the
engine-ECU. Based on the voltage output by these sensors, the engine-ECU controls fuel injection
amount in accordance with the accelerator pedal position. |
|
| Rail pressure sensor |
Detects the fuel pressure in the common rail and input it into the
engine-ECU. The engine-ECU uses the voltage that is output by this sensor to regulate the fuel
pressure in the common rail. |
|
| Engine coolant temperature sensor |
Contains a thermistor to detect the engine coolant temperature. The
engine-ECU determines the warm-up condition of the engine based on the signals output by this
sensor, and controls the pre-glow time and fuel injection amount. |
|
| Fuel temperature sensor |
Contains a thermistor to detect the fuel temperature. Based on the
voltage that is output by this sensor, the engine-ECU corrects the fuel injection amount to
suit the fuel temperature. |
|
| Crank angle sensor |
Detects the engine speed and crankshaft position. Based on this signal,
the engine-ECU controls the fuel injection amount and fuel injection timing. |
|
| Air flow sensor |
Measures the current air mass. The engine-ECU calculates the exhaust
gas recirculation rate based on this output signal. |
|
| Air temperature sensor |
Contains a thermistor to detect the air temperature. Based on the
voltage that is output by this sensor, the engine-ECU corrects the fuel injection amount and
the fuel injection timing. |
|
| Intake air temperature sensor |
Contains a thermistor to detect the intake air temperature. Based
on the voltage that is output by this sensor, the engine-ECU corrects the fuel injection amount
and the fuel injection timing. |
|
| Camshaft position sensor |
Detects the No. 1 cylinder compression top dead centre position by
means of a Hall element. |
|
| Intake air pressure sensor |
Detects the absolute pressure in the inlet manifold. The engine-ECU
uses the voltage that is output by this sensor to control the boost pressure. |
|
| Barometric pressure sensor |
Detects the barometric pressure. The engine-ECU corrects the boost
pressure and EGR amount to suit the barometric pressure. |
|
| EGR valve position sensor |
Detect the opening amount of the EGR valve and input it into the
engine-ECU. Based on the voltage output by these sensors, the engine-ECU effects feedback control
for the EGR valve position. |
|
| Throttle position sensor |
Detect the position of the throttle valve and input it into the engine-ECU.
Based on the voltage output by these sensors, the engine-ECU effects feedback control for the
throttle valve position. |
|
| Variable geometry position sensor |
Detect the position of the variable geometry control motor and input
it into the engine-ECU. Based on the voltage output by these sensors, the engine-ECU effects
feedback control for the variable geometry control motor position. |
|
| Proportional oxygen sensor |
The proportional oxygen sensor is used to detect the excess-air factor
"Lambda" in the exhaust gas. The engine-ECU calculates the exhaust gas recirculation rate based
on this output signal. |
|
| Exhaust gas temperature sensor |
Detect the exhaust gas temperature at the downstream of the catalytic
converter and input it into the engine-ECU. The engine-ECU uses the voltage output by those
sensors for controlling the DPF regeneration. |
|
| Exhaust differential pressure sensor |
Detects the pressure difference between upstream exhaust gas pressure
of the DPF and the atmospheric pressure. The engine-ECU assumes the rate of PM anticipates in
the DPF using the voltage output by this sensor. |
|
| Alternator FR terminal |
This terminal is used for detecting the duty cycle ratio that energizes
the alternator field coil. |
|
| Engine oil pressure switch |
Detects the conditions of the engine oil pressure and inputs it to
the engine-ECU. |
|
| Cruise control switch |
Detects the ON of cruise switch and inputs it to the engine-ECU. |
|
| Stop lamp switch |
Detects the depression of brake pedal and inputs it to engine-ECU. |
|
| Clutch switch |
Detects the depression of clutch pedal and inputs it to the engine-ECU. |
|
| Glow diagnosis signal |
Detects the malfunction of the glow system and inputs it to the engine-ECU. |
|
| Actuators |
Injectors |
Inject fuel in accordance with the actuation signals provided by
the engine-ECU. |
| High pressure fuel regulator |
Controls the fuel pressure in the fuel rail in accordance with the
signals provided by the engine-ECU. |
|
| Fuel flow regulator |
Adjusts the fuel flow into the fuel rail in accordance with the signals
provided by the engine-ECU. This allows controlling the fuel pressure in the common rail. |
|
| Engine control relay |
In accordance with the signals provided by the engine-ECU, this relay
controls the power supply for the engine-ECU, sensors and actuators. |
|
| Glow plug relay |
Controls the actuation of the glow plugs in accordance with the signals
provided by the engine-ECU. |
|
| A/C compressor relay |
Controls the actuation of the A/C compressor in accordance with the
signals provided by the engine-ECU. |
|
| Throttle valve control motor |
Controls the throttle valve opening angle in accordance with the
signals provided by the engine-ECU. |
|
| Swirl control solenoid valve |
Open and close the swirl control valve in accordance with the signals
provided by the engine-ECU. |
|
| EGR valve (DC motor) |
Controls the exhaust gas recirculation flow volume in accordance
with the signal provided by the engine-ECU. |
|
| EGR cooler solenoid valve |
Open and close the exhaust flap in accordance with the signal provided
by the engine-ECU. |
|
| Variable geometry control motor |
Controls the angle of the variable nozzle in accordance with the
signals provided by the engine-ECU. |
|
| Proportional oxygen sensor heater |
Controls the current applied to the proportional oxygen sensor heater
circuit in accordance with the signals from the engine-ECU. |
|
| Alternator L terminal |
Controls the initiating excitation current to the alternator in accordance
with the signals provided by the engine-ECU. |
|
| Fuel pump relay |
Controls the power supplied to the fuel pump in accordance with the
signals provided by the engine-ECU. |
|
| Starter relay |
Controls the power supplied to the starter in accordance with the
signals provided by the engine-ECU. |
|