Diagnostic Functions

Diagnostic functions

General





The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.

Diagnostic trouble codes (DTCs)
A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined as permanent. Other faults which are detected are defined as intermittent.

An operating cycle always covers ignition on and then ignition off.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.

Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.

Reading off input and output signals
This function can be used continuously to read off the values of the control module's input and output signals.

For further information about parameters, see Description of parameters.

Activating components
This function can be used to activate components to check that they are working.

For further information about activation, see Description of activations.

Calibration
To check that Four-C is working correctly, adaptive data must be calibrated in the suspension module (SUM) after repair or if the control module has been repaired. Calibration is carried out according to VIDA vehicle communication.

Reading off the control module identification
VIDA identifies control modules by reading off a number of codes from the control module memory. The codes contain information about the control module:
^ hardware P/N (control module without software)
^ hardware serial number (control module without software)
^ software P/N
^ diagnostic software P/N (part of the software).