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)
If the control module detects a fault, a diagnostic trouble code is stored. A fault that was detected during the last driving cycle is defined as permanent. Other faults that are detected are defined as intermittent.

Reading out and erasing diagnostic trouble codes
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 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 more information, see Vehicle communication information in Specifications, other.

Reading off parameter values
Using this function the status or value of parameters can be read out. The status/value is presented digitally.
For more information, see Vehicle communication information in Specifications, other.

Restoring spare battery (Volvo On Call)
This service is used when the reserve battery has been replaced to reset the value to 100%. The algorithm of the battery must be reset if the reserve battery in a phone module (PHM) with Volvo On Call is replaced.