Diagnostic Functions

Diagnostic functions

General
The control module has an integrated diagnostic system, which continuously monitors its own system as well as the input and output signals.

Diagnostic trouble codes (DTCs)
If the control module detects a fault then it stores a diagnostic trouble code. If a fault disappears for any reason after a diagnostic trouble code has been permanently stored in the control module then the information on the diagnostic trouble code remains in the control module for 100 driving cycles.

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

Note! Diagnostic trouble codes (DTCs) can be erased without having been read off.

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 identification
The control module can be identified by means of reading off a number of codes.
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.