BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE on combination meter. If any malfunction occurs in the ASCD system, it automatically deactivates control.
Note. Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor (POS) Camshaft position sensor (PHASE) | Engine speed (1) Piston position | Cooling fan control | IPDM E/R ↓ Cooling fan relay ↓ Cooling fan motor |
| Engine coolant temperature sensor | Engine coolant temperature | ||
| Refrigerant pressure sensor | Refrigerant pressure | ||
| Battery | Battery voltage (1) | ||
| Combination meter | Vehicle speed (2) | ||
| BCM | Air conditioner ON signal (2) | ||
| (1) The ECM determines the start signal status by the signals of engine speed and battery voltage. (2) This signal is sent to ECM via the CAN communication line. | |||
| (1) | The ECM determines the start signal status by the signals of engine speed and battery voltage. |
| (2) | This signal is sent to ECM via the CAN communication line. |
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor (POS) Camshaft position sensor (PHASE) | Engine speed | Engine mount control | Electronic controlled engine mount control solenoid valve |
| Combination meter | Vehicle speed (1) | ||
| (1) This signal is sent to the ECM via the CAN communication line. | |||
| (1) | This signal is sent to the ECM via the CAN communication line. |
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor (POS) | Engine speed (1) Piston position | EVAP canister purge flow control | EVAP canister purge volume control solenoid valve |
| Camshaft position sensor (PHASE) | |||
| Mass air flow sensor | Amount of intake air | ||
| Engine coolant temperature sensor | Engine coolant temperature | ||
| Air fuel ratio (A/F) sensor 1 | Density of oxygen in exhaust gas (Mixture ratio feedback signal) | ||
| Throttle position sensor | Throttle position | ||
| Accelerator pedal position sensor | Accelerator pedal position | ||
| Battery | Battery voltage (1) | ||
| Combination meter | Vehicle speed (2) | ||
| (1) ECM determines the start signal status by the signals of engine speed and battery voltage. (2) This signal is sent to the ECM via the CAN communication line. | |||
| (1) | ECM determines the start signal status by the signals of engine speed and battery voltage. |
| (2) | This signal is sent to the ECM via the CAN communication line. |
Scheme 137
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and idling.
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Note. Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.
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| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor (POS) | Engine speed and piston position | Intake valve timing control | Intake valve timing control solenoid valve |
| Camshaft position sensor (PHASE) | |||
| Engine oil temperature sensor | Engine oil temperature | ||
| Engine coolant temperature sensor | Engine coolant temperature | ||
| Combination meter | Vehicle speed (1) | ||
| (1) This signal is sent to the ECM via the CAN communication line | |||
| (1) | This signal is sent to the ECM via the CAN communication line |
Scheme 154
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.
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| Unit/Sensor | Input signal to ECM | ECM function |
|---|---|---|
| EVAP control system pressure sensor | Pressure in purge line | Fuel filler cap warning control |
| Combination meter | Fuel level sensor signal (1) | |
| Fuel filler cap warning reset signal (1) | ||
| (1) This signal is sent to the ECM via the CAN communication line. | ||
| (1) | This signal is sent to the ECM via the CAN communication line. |
INPUT SIGNAL SPECIFICATION
| Unit | Output signal | Actuator |
|---|---|---|
| ECM | Fuel filler cap warning display signal (1) | Combination meter |
| (1) This signal is sent to the combination meter via the CAN communication line. | ||
| (1) | This signal is sent to the combination meter via the CAN communication line. |
OUTPUT SIGNAL SPECIFICATION
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor (POS) Camshaft position sensor (PHASE) | Engine speed* | VIAS control | VIAS control solenoid valve 1 VIAS control solenoid valve 2 |
| Mass air flow sensor | Amount of intake air | ||
| Engine coolant temperature sensor | Engine coolant temperature | ||
| Throttle position sensor | Throttle position | ||
| Accelerator pedal position sensor | Accelerator pedal position | ||
| Battery | Battery voltage (1) | ||
| (1) ECM determines the start signal status by the signals of engine speed and battery voltage. | |||
| (1) | ECM determines the start signal status by the signals of engine speed and battery voltage. |
Scheme 169
In the medium speed range, the ECM sends the ON signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes the power valve. Under this condition, the pressure waves of the exhaust stroke do not disturb the pressure waves of the intake stroke of each opposite bank. Therefore, charging efficiency is increased together with the effect of the long intake passage.
However, in the high speed range, the ECM sends the OFF signal to the VIAS control solenoid valve and the power valve is opened. Under this condition, the pressure waves of intake stroke are resonant with those of each opposite bank exhaust stroke. Therefore, charging efficiency is also increased.
In addition, both valves 1 and 2 are opened or closed in other ranges mentioned above. Thus maximum charging efficiency is obtained for the various driving conditions.
