V50 L5-2.4L VIN 39 B5244S7 (2005)
Mathematical calculations and signals from certain components are used to calculate the substitute values. Other substitute values are fixed, predefined
values in the control module.
The substitute value allows the car to be driven and for the emissions to be kept at a reasonable level even though vital functions/components are
malfunctioning.
Functions which may be limited are for example:
-
Camshaft control (CVVT)
-
fuel trim
-
throttle angle
-
fuel pressure regulation.
The substitute values are used and functions restricted so that the system is still able to work whilst protecting components that are required for safety
reasons (for example the throttle angle).
Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using VIDA via the data link connector
(DLC) in the vehicle.
Signals
The table below summarizes the input signals to and output signals from the Engine Control Module (ECM). The signal types are divided into directly
connected signals, serial communication and controller area network (CAN) communication. The illustration below displays the same information with
the Volvo component designations.
