Volvo Workshop Manuals
XC90 AWD V8-4.4L VIN 85 B8444S (2005)
Relays and Modules > Relays and Modules - Transmission and Drivetrain > Relays and Modules - A/T > Control Module, A/T > Component Information > Locations > Page 2270
Control Module: Description and Operation
TCM diagnostic functions
The control unit has built-in diagnostics, Volvo Diagnostics, which continually monitor the system and the input and output signals.
Diagnostic trouble codes
If the control unit detects a fault, it stores a diagnostic trouble code. If, for any reason, a fault disappears after the diagnostic trouble code has been
Reading and erasing diagnostic trouble codes
Stored diagnostic trouble codes can be read and erased using this facility.
Reading input and output signals
Status of control unit input and output signals can be continually read using this facility.
Activation of components
Using this facility, components can be activated to check their function.
Reading the control unit identification
VIDA identifies control units by reading the number of codes from the control unit memory.
hardware component number (control unit without software)
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