AUM Diagnostic Functions

AUM diagnostic functions

General
The control unit has built-in diagnostics, Volvo Diagnostics, that continually monitor the control unit and the input and output signals.

Diagnostic trouble codes
If the control unit detects an error, it stores a diagnostic trouble code. There are 36 diagnostic trouble codes in total. An error that was detected the last time the engine was running is defined as permanent. Other detected errors are defined as intermittent.

Reading and erasing diagnostic trouble codes
Stored diagnostic trouble codes can be read and erased using this facility.

Erasing diagnostic trouble codes can only be done when all the diagnostic trouble codes have been read at least once.

Reading and erasing the user information
Stored user information can be read and erased using this facility.

4201 Focusing error
- CD inserted the wrong way
- Condensation in CD-player or on disc
- Faulty CD
- Faulty CD player

4203 Servo error
- Read-out error in CD player
- Faulty CD
- Faulty CD player

42F1 Disc feed error
- Dirt in CD compartment
- Faulty CD
- Faulty CD player

42F3 Pick-up error
- Faulty CD player

4301 Focusing error
- Condensation on MiniDisc or in MiniDisc player
- Faulty MiniDisc
- Faulty MiniDisc player

4303 Servo error
- Read-out error in MiniDisc player
- Faulty MiniDisc
- Faulty MiniDisc player

43F1 Disc feed error
- Dirt in MiniDisc player
- Faulty MiniDisc
- Faulty MiniDisc player

43F3 Pick-up error
- Faulty MiniDisc player

4401 Focusing error
- CD inserted the wrong way
- Condensation on CD or in 4-disc CD changer
- Faulty CD
- Faulty 4-disc CD changer

4403 Servo error
- Read-out error in 4-disc CD changer
- Faulty CD
- Faulty 4-disc CD changer

44F1 Disc feed error
- Dirt in CD compartment
- Faulty CD
- Faulty 4-disc CD changer

44F2 Error in selecting CD
- Faulty CD
- Faulty 4-disc CD changer

44F3 Pick-up error
- Faulty 4-disc CD changer

4501 Cassette feed error
- Dirt in cassette compartment
- Faulty cassette
- Faulty cassette player

4601 Focusing error
- CD inserted the wrong way
- Condensation on CD or in 10-disc CD changer
- Faulty CD
- Faulty 10-disc CD changer

4603 Servo error
- Read-out error in 10-disc CD changer
- Faulty CD
- Faulty 10-disc CD changer

46F1 Disc feed error
- Faulty CD cartridge
- Faulty CD
- Faulty 10-disc CD changer

46F2 Error in selecting CD
- Faulty CD
- Faulty 10-disc CD changer

46F3 Pick-up error
- Faulty 10-disc CD changer

Reading the control unit identification
VADIS/VIDA identifies control units by reading the number of codes from the control unit memory.

The codes contain information on the control unit:
- hardware component number (control unit without software)
- hardware series number (control unit without software)
- software component number
- diagnostic software component number