FUNCTION OF MAIN COMPONENTS
The main components of the 1AD-FTV engine control system are as follows:
| Components | 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 | The 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. |
| Manifold Absolute Pressure Sensor (Diesel Turbo Pressure Sensor) | Semiconductor Silicon Chip Type | 1 | This sensor uses built-in semiconductors to detect the intake manifold pressure. |
| Common Rail Assembly (Fuel Pressure Sensor) | Semiconductor Strain Gauge Type | 1 | This sensor uses built-in semiconductors to detect the internal pressure of the common-rail. |
| Crank Position Sensor (Rotor Teeth) | Pick-up Coil Type (36-2) | 1 | This sensor detect crank angle and engine speed. |
| Cam Position Sensor (No. 1 Crank Position Sensor) (Rotor Teeth) | Magneto-Resistance Element (MRE) Type (3) | 1 | This sensor performs the cylinder identification. |
| Accelerator Pedal Sensor Assembly | Non-contact Type | 1 | This sensor detects the amount of pedal effort applied to the accelerator pedal. |
| 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. |
| Injector Assembly | Piezo Type | 4 | The injector injects fuel by vertically driving the nozzle needle after activating the piezo actuator based on signals from the ECM. |
| Intake Air Temperature Sensor (Intake Mass Air Flow Meter Sub-assembly) | 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 Body Assembly (Diesel Throttle Control Motor) | DC Motor | 1 | The 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. |
| Intake Air Temperature Sensor (Turbo) | Thermistor Type | 1 | This sensor detects the intake air temperature after the intercooler assembly. |
SYSTEM CONTROL
System Control Table
The engine control system of the 1AD-FTV engine has the following systems.
| System | Outline |
|---|---|
| Fuel Injection Volume Control | Based on the signals received from the various 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 various sensors, the ECM determines the fuel injection timing in accordance with the engine condition. |
| Fuel Pressure Control | Based on the signals received from the various sensors, the ECM determines the fuel pressure via the metering unit and fuel pressure regulator in accordance with the engine condition. |
| Pilot Injection Control | Based on the signals received from the various sensors, the ECM determines pilot injection volume, timing, and 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 when the current is applied to the glow plugs, in accordance with the coolant temperature. |
| Turbocharger Control | Based on signals from the various sensors, the ECM controls the turbocharger in accordance with engine condition by adjusting the nozzle vane. |
| Cooling Fan Control | Cooling fan operation is controlled by signals from the ECM based on the coolant temperature, air conditioning condition, engine speed and vehicle speed. |
| Air Conditioning Cut-off Control*1 | By turning the air conditioning compressor on or off in accordance with the engine condition, drivability is maintained. |
| Starter Control (Cranking Hold Function)*2 | Once the engine switch is pushed, this control operates the starter until the engine starts. |
| Engine Immobiliser | Prohibits fuel injection if an attempt is made to start the engine with an invalid ignition key. |
| Oil Maintenance Management System | When the ECM determines that the engine oil has deteriorated, when the engine oil level sensor detects that the engine oil level has increased, or when the running distance exceeds a predetermined value, the oil change reminder indicator light turns on to inform the driver of it. |
| Brake Override System | Restricts the driving torque when the brake pedal is depressed while the accelerator pedal is depressed. (For the Activation Conditions and Inspection Method, refer to the repair manual) |
*1: Models with air conditioning system
*2: Models with entry and start system
FAIL-SAFE
When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in memory. For details, refer to the Repair Manual.
DIAGNOSIS
When the ECM detects a malfunction, the ECM diagnoses and memorizes information related to the fault. For details, refer to the Repair Manual.