Reference voltage Undervoltage Uref
|  | Description
|  | Effects on the driving operation
|  | Possible causes
|  | Place of action
|  | Instruction
|  | Setting conditions of the event
|  | Test conditions of the event
|  | Final function check
|  | See also:
Description Undervoltage Uref Effects on the driving operation Driving operation restricted. Frequency measurement and temperature measurement non-functional. Possible causes The voltage regulator for 12V constant voltage operates outside the allowed tolerance. Place of action Transmission control unit Instruction Replace transmission control unit. Setting conditions of the event Supply voltage > 16V, Uref < 11.5V for at least 100ms. Test conditions of the event No description available. Final function check If the defective component cannot be clearly identified, you should try to reproduce the fault: Reinstall the component in the vehicle. Test the function. After the fault has been eliminated, the following steps have to be carried out: Conduct a test drive with function check. Read out the fault memory. Check the transmission for leaks. Perform a final visual inspection. These steps are necessary to ensure the entire vehicle functions. See also:
|  | Aftersales service index
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