FUNCTION OF MAIN COMPONENTS
The main components of the 1ND-TV 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. |
| The atmospheric pressure sensor built into the ECM measures the atmospheric pressure. | |||
| Atmospheric Temperature Sensor | Thermistor Type | 1 | This sensor is built into the air flow meter and detects the atmospheric temperature by means of an internal thermistor. |
| Intake Mass Air Flow Meter Sub-assembly | Silicon chip Type (Digital Signal Type) | 1 | This sensor has a built-in hot-wire to directly detect the intake air mass and flow rate. |
| Crank Position Sensor (Rotor Teeth) | Pickup Coil Type (60-2) |
1 | This sensor detects the engine speed and performs cylinder identification. |
| Cam Position Sensor (No. 1 Crank Position Sensor) (Rotor Teeth) | Magneto-Resistance Element (MRE) Type (3) | 1 | This sensor performs cylinder identification. |
| Engine Coolant Temperature Sensor | Thermistor Type | 1 | This sensor detects the engine coolant temperature by means of an internal thermistor. |
| Accelerator Pedal Sensor Assembly | Non-contact Type | 1 | This sensor detects the amount of pedal effort applied to the accelerator pedal. |
| Diesel Throttle Body Assembly (Throttle Position Sensor) | Non-contact Type | 1 | This sensor is built into the throttle body and detects the throttle valve opening angle. |
| Injector Assembly | Solenoid Type | 4 | The fuel injector assembly is an electromagnetically operated solenoid with a nozzle which injects fuel in accordance with signals from the ECU. |
| Diesel Turbo Pressure Sensor | Semiconductor Silicon Chip Type | 1 | This sensor uses built-in semiconductors to detect the intake manifold pressure. |
| Intake Air Temperature Sensor (Turbo) | Thermistor Type | 1 | This sensor detects the intake air temperature after the intercooler. |
| 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. |
| Supply Pump Assembly (Fuel Temperature Sensor) | Thermistor Type | 1 | This sensor detects the fuel temperature in the supply pump by means of an internal thermistor. |
| Engine Oil Level Sensor | ON/OFF Switch Type | 1 | This sensor detects the engine oil level via the oil upper level switch and the oil lower level switch. |
SYSTEM CONTROL
System Control Table
The engine control system of the 1ND-TV 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 operating conditions. |
| 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 operating conditions. |
| 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 operating conditions. |
| Idle Speed Control | The ECM determines the idle speed in accordance with the engine operating conditions, and controls the fuel injection volume in order to maintain the target idle speed. |
| 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 operating conditions. |
| 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. |
| Intake Throttle Control | Based on the signals received from the various sensors, the ECM determines throttle position in accordance with engine condition. |
| Fully closes the diesel throttle control valve in order to reduce the vibration when the engine is stopped. | |
| Cooling Fan Control | Cooling fan operation is controlled by signals from the ECM based on the coolant temperature, air conditioning operating conditions, 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 operating conditions, drivability is maintained. |
| 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 engine oil change reminder indicator light turns on to inform the driver of it. |
| Starter Control (Cranking Hold Function)*2 | Once the engine switch is pushed, this control operates the starter until the engine starts. |
| 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) |
*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 the memory. For details, refer to the Repair Manual.
DIAGNOSIS
When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section. For details, refer to the Repair Manual.