FUNCTION OF MAIN COMPONENTS
The main components of the engine control system are as follows:
| Component | Outline | Quantity | Function |
|---|---|---|---|
| ECM | 32-bit CPU | 1 | The ECM effects overall control of the engine control system to suit the operating conditions of the engine in accordance with the signals provided by the sensors. |
| Injector Driver | Including Built-in DC/DC Converter | 1 | This injector driver is used to drive the injector at high speeds. The injector driver achieves high-speed driving under high fuel pressure conditions through the use of a DC/DC converter that provides a high voltage, quick-charging system. |
| Turbo Pressure Sensor | Semiconductor Silicon Chip Type | 1 | This sensor uses built-in semiconductors to detect the intake manifold pressure. |
| Atmospheric Pressure Sensor | Semiconductor Silicon Chip Type | 1 | This sensor, which is built into the ECM, uses semiconductors to detect the atmospheric pressure. |
| Fuel Pressure Sensor | Semiconductor Strain Gauge Type | 1 | This sensor uses built-in semiconductors to detect the internal pressure of the common-rail. |
| Crankshaft Position Sensor [Rotor Teeth] | Pick-up Coil Type [36 - 2] | 1 | This sensor detects the engine speed and performs the cylinder identification. |
| Camshaft Position Sensor [Rotor Teeth] | Pick-up Coil Type [1] | 1 | This sensor performs the cylinder identification. |
| Intake Mass Air Flow Meter Sub-assembly | Hot-wire Type | 1 | This sensor uses a built-in hot-wire to directly detect the intake air mass and flow rate. |
| Intake Air Temperature Sensor | Thermistor Type | 1 | This sensor, which is provided at the air cleaner outlet, detects the atmospheric temperature using an internal thermistor. This sensor is built into the intake mass air flow meter sub-assembly. |
| Diesel Throttle Control Motor | DC Motor | 1 | This diesel throttle control motor regulates the opening of the diesel throttle valve in accordance with the signals from the ECM. |
| Engine Coolant Temperature Sensor | Thermistor Type | 1 | This sensor detects the engine coolant temperature using an internal thermistor. |
| Inlet Air Temperature Sensor | Thermistor Type | 1 | This sensor detects the intake air temperature after the intercooler assembly. |
SYSTEM CONTROL
The engine control system has the following features. The ECM controls these systems:
| System | Outline |
|---|---|
| Fuel Injection Volume Control | Based on the signals received from the sensors, the ECM determines the fuel injection volume in accordance with the engine condition. |
| Fuel Injection Timing Control | Based on the signals received from the sensors, the ECM determines the fuel injection timing in accordance with the engine condition. |
| Fuel Pressure Control | Based on the signals received from the sensors, the ECM controls fuel pressure using the SCV in accordance with engine conditions. |
| Pilot Injection Control | Based on the signals received from the various sensors, the ECM determines pilot injection volume, timing, and the interval between pilot injection and main injection in accordance with the engine condition. |
| Idle Speed Control | The ECM determines the idle speed in accordance with the engine condition, and controls the fuel injection volume in order to maintain the target idle speed. |
| Glow Plug Control | Controls the length of time that the current is applied to the glow plugs for, in accordance with engine coolant temperature. |
| Turbo Pressure Control | Based on the signals received from the sensors, the ECM controls the actuator via the E-VRV in accordance with the engine condition by adjusting the nozzle vane. |
| Cooling Fan Control | Cooling fan operation is controlled by signals from the ECM based on the engine coolant temperature, air conditioning condition*1, engine speed and vehicle speed. |
| Diesel Throttle Control | Based on the signals received from the various sensors, the ECM determines throttle position in accordance with the engine condition and fully closes the diesel throttle control valve in order to reduce the vibration when the engine is stopped. |
| Air Conditioning Cut-off Control | By switching the air conditioning compressor assembly on or off in accordance with the engine condition, driveability is maintained. |
| Starter Control (Cranking Hold Function)* | Once the engine switch is pushed, this control continues to operate the starter until the engine is started. |
| Immobiliser System | Prohibits fuel injection if an attempt is made to start the engine with an invalid key. |
| Oil Maintenance Management System | When the ECM determines engine oil deterioration, "OIL MAINTENANCE REQUIRED" is shown on the multi-information display to inform the driver. |
| Brake Override System | The driving torque is restricted when both the accelerator and brake pedals are depressed. (For the Activation Conditions and Inspection Method, refer to the repair manual) |
| Diagnosis | When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section. |
| Fail-safe | When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in the memory. |
*: Models with entry and start system