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 then it stores a diagnostic trouble code (DTC). If a fault disappears for any reason after a diagnostic trouble code (DTC) has been permanently stored in the control module then the information on the diagnostic trouble code (DTC) remains in the control module.

Reading and erasing diagnostic trouble codes (DTCs)
Diagnostic trouble codes (DTCs) stored in the control module can be read off using these functions.

Reading off input and output signals
This function can be used to continuously read off the status of the control module's input and output signals.
For more information about parameters, see Vehicle communication information in Specifications, other.

Reading off the control module identity
By reading off a number of codes from the control module memory, the control module can be identified. The codes contain the following information about the control module:
- hardware P/N
- software P/N
- diagnostic software P/N