Controlling Turbocharger (TC) Boost Pressure
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
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.