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Input values for "Automatic undervoltage shutoff” (code "XXXX1”) > < Requirements

A4 Mk2

Adaption procedure
Adaption procedure
–  With the ignition switched off, connect up vehicle diagnostic, testing and information system -VAS 5051A- with diagnostic wire -VAS 5051/5A- and K-wire adapter -VAS 6017B- (or K-wire adapter -VAS 6017A-) to the 16-pin diagnostic socket in the vehicle and use address word “18” to select the auxiliary heater control unit -J364- → Chapter, → Chapter and → Current flow diagrams, Electrical fault finding and Fitting locations.
   
Indicated on display of vehicle diagnostic, testing and information system -VAS 5051A-:
t  Code entered for this control unit is displayed in zone -2- (correct if necessary → Chapter).
–  Interrogate fault memory → Chapter and eliminate any faults displayed.
–  Select function “10 - Adaption”.
  A87-0314
Indicated on display of vehicle diagnostic, testing and information system -VAS 5051A-:
t  Prompt for entering channel number appears in display zone -1-.
t  Input keypad appears in display zone -2-.
–  Use input keypad in display zone -2- to enter “01” for channel “01” and confirm by touching Q key.
  Note
  A87-0318
t  Possible causes if display zone -1- indicates “Function unknown or cannot be implemented at present”:
t  Selection of adaption channel not intended for service use (check entry)
t  Fault on convenience data bus system
  A87-0314
t  If display zone -1- indicates “Disabled”, adaption function is currently not available due to having been incorrectly implemented several times.
t  Wait for completion of disable time.
Indicated on display of vehicle diagnostic, testing and information system -VAS 5051A-:
t  Display zone -1- indicates “Channel 1 reading and testing”.
t  Display in area -2- is “Undervoltage shutoff”.
t  A bar appears in area -3- (not to be used for this application).
–  Touch key -4- (for entry via keypad).
  A82-0237
Indicated on display of vehicle diagnostic, testing and information system -VAS 5051A-:
t  Display zone -1- indicates “Enter adaption value: 0....XXXXX”.
t  Input keypad appears in display zone -2-.
–  Use input keypad in display zone -2- to enter coded shutoff voltage for re-adaption of auxiliary heater control unit -J364- in line with encoding of auxiliary heater control unit -J364- as per table. For code “XXXX1”, refer to → Chapter or for code “XXXX2” to → Chapter.
  Note
t  The voltage value can be altered within the specified limits. The voltage value entered should however not be too high or too low → Chapter and → Chapter.
t  The shutoff voltage value set at the factory of 12.17 V (for code XXXX1 ) and 9.5 V (for code XXXX2 ) can be altered within the specified limits.
t  In the event of frequent activation of the auxiliary heater, auxiliary heater availability can be increased by reducing the adaption value with code “XXXX1” to a voltage of min. 10.1 V if requested by the customer. Customers must however be made aware of the possible consequences (engine starting problems may be encountered with this setting on account of excessive discharge of the battery -A-).
t  If the adapted voltage value is too high, auxiliary heater operating problems may be encountered (undervoltage shutoff).
t  If the adapted voltage value is too low (less than 11.30 V), engine starting problems may occur.
t  Depending on the version of the auxiliary heater control unit -J364-, rounding of the calculated value may result in the display and storage of slightly different values than in the table.
t  In addition to the values given in the tables, it is also possible to enter intermediate values (one unit corresponds to roughly 0.07 V).
t  The values in the two tables differ on account of different conversion values.
  A87-0318

Input values for "Automatic undervoltage shutoff” (code "XXXX1”) > < Requirements