Transmission Control Module (TCM) Diagnostic Functions

Transmission control module (TCM) diagnostic functions
General





The control module has a built-in diagnostic system, the Volvo On-Board Diagnostic (OBD) system. This system continuously monitors its At own system and the input and output signals.

Diagnostic trouble codes (DTCs)
The control module will store a Diagnostic Trouble Code (DTC) if it detects a fault. If a fault disappears for any reason after the Diagnostic Trouble Code (DTC) has been permanently stored in the control module, information about the fault remains stored in the control module.

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 when all Diagnostic Trouble Codes (DTCs) have been read at least once.

Reading off input and output signals
Using this function, the status of the control module input and output signals can be continuously read off.

Activating components
This function allows components to be activated so that their functions can be checked.

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