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 (DTC's)
A diagnostic trouble code (DTC) is stored if the control module detects a fault. The control module can store up to 10 diagnostic trouble codes (DTC's). A fault which is detected in the most recent operating cycle is defined as permanent. Other faults which are detected are defined as intermittent.

Reading and erasing diagnostic trouble codes (DTC's)
Stored diagnostic trouble codes (DTC's) can be read off and erased using this function.
Diagnostic trouble codes (DTC's) can only be erased once all the diagnostic trouble codes (DTC's) have been read off at least once.

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.

Reading off extended diagnostic trouble code (DTC) information
This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are called frozen values.
For further information, see: Description of frozen values, central electronic module (CEM) Description Of Frozen Values, Central Electronic Module (CEM)

Reading off the parameter values
Using this function, the status or value of parameters can be read off. The status/value is presented digitally.
For further information about the different parameters, see: Description of parameters Description Of Parameters

Activating components and functions
This function can be used to activate components and functions which affect the outputs of the central electronic module (CEM).
For further information, see: Description of activations Description Of Activation

Reading off and programming data
This function allows programmed data to be read off or data such as customer parameters to be programmed in.

Note! If possible, all data must be read out from the control module before replacement. After replacement the relevant data must be programmed into the new control module. The data must be read off before the control module is replaced. This is so that the same information can be programmed in to the new control module.

Programming keys

Add or Remove key
This function is used to add a new key or remove a non-functioning or lost key.