Volvo Workshop Manuals
XC70 L5-2.5L Turbo VIN 59 B5254T2 (2003)
Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Description and Operation > System Overview > Page 1104
Control Module: Description and Operation
Transmission control module (TCM) diagnostic functions
The control module has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system. This system continuously monitors its own system
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
Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Reading off input and output signals
Using this function, the status of the control module input and output signals can be continuously read off.
This function allows components to be activated so that their functions can be checked.
Reading off the control module identification
VADIS identifies the control modules by reading off a number of codes from the control module memory.
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
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