P0AF4

P0AF400

Diagnosis information - High-voltage power electronics control unit

Temperature recording

DANGER
High voltage.
Death or severe injuries due to high voltage or high current.

- De-energise the vehicle in accordance with the guidelines.
- Work must not be performed on parts carrying a high voltage.

- Please read the following document in the PIWIS information system:

- 2X00IN Isolating High-voltage electrical system from power supply/Starting high High-voltage electrical system voltage

Diagnostic conditions
The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.
- Ignition on

Possible fault causes
- Temperature, Limit exceeded
- Temperature, Below limit
- Cooling system defective
- High-voltage power electronics control unit faulty