Driver Information Module (2001): Function: Tachometer
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
A flywheel sensor (7/25) is connected to the engine control module (ECM) (4/46). The engine control module (ECM) transmits the engine speed signal onwards via the high speed section of the Control Area Network (CAN). The central electronic module (CEM) (4/56) receives the signal and generates a corresponding signal on the low speed section of the Control Area Network (CAN). The driver information module (DIM) (5/1) reads the signal from the low speed section of the Control Area Network (CAN). The driver information module receives the value and presents the actual engine speed for the driver.