Controlling Turbocharger (TC) Boost Pressure

The turbocharger (TC) control valve duty cycle (pulsed signal) is controlled by a desired value computed by the engine control module (ECM).

To calculate the desired value for the turbocharger (TC) the engine control module (ECM) uses signals from the following sensors: 

• throttle position (TP) sensor (8)
• mass air flow (MAF) sensor (9)
• engine speed (RPM) sensor (10)
• atmospheric pressure (11).

There is no boost pressure sensor in this turbocharger (TC) system. The engine control module (ECM) uses the mass air flow (MAF) sensor signal (air flow through the air cleaner (ACL)) to calculate boost pressure.