INPUT/OUTPUT SIGNAL CHART

Sensor | Input signal to ECM | ECM function | Actuator
Crankshaft position sensor (POS) Camshaft position sensor (PHASE) | Engine speed | Turbocharger boost control | Turbocharger boost control solenoid valve ↓ Boost control actuator
Mass air flow sensor | Amount of intake air
Intake air temperature sensor | Intake air temperature
Engine coolant temperature sensor | Engine coolant temperature
Throttle position sensor | Throttle position
Accelerator pedal position sensor | Accelerator pedal position
Turbocharger boost sensor | Turbocharger boost
EVAP control system pressure sensor | Atmospheric pressure

SYSTEM DESCRIPTION

1. | Mass air flow sensor | 2. | Charge air cooler | 3. | Recirculation valve
4. | Turbocharger | 5. | Air fuel ratio sensor 1 | 6. | Heated oxygen sensor 2
7. | Turbocharger boost sensor | 8. | Electric throttle control actuator | 9. | EVAP canister purge volume control solenoid valve
10. | Turbocharger boost control solenoid valve | 11. | Boost control actuator |  |

Depending on driving conditions, the ECM performs ON/OFF duty control of the turbocharger boost control solenoid valve and controls the boost by adjusting the pressure to the diaphragm of the boost control actuator. When driving conditions demand an increase in boost, the ECM prolongs the ON time of the turbocharger boost control solenoid valve and moves the boost control valve towards the closing direction by reducing the pressure in the diaphragm of the boost control actuator. The emission gas to the turbine wheel is then increased. When driving conditions demand a decrease in boost, the ECM shortens the ON time of the turbocharger boost control solenoid valve and moves the boost control valve towards the opening position by increasing the pressure in the diaphragm of the boost control actuator. The emission bypassing to the turbine wheel is then increased. Thus, by performing the most optimal boost control, the ECM improves engine output and response.
NOTE：
The boost varies depending on the vehicle and driving conditions.
BOOST CONTROL ACTUATOR LINE DRAWING

1. | Boost control actuator (bank 1) | 2. | Boost control actuator (bank 2) | 3. | Turbocharger boost control solenoid valve
A. | Engine right side | B. | Engine left side | C. | Engine front side
: Vehicle front |  |  |  |