Škoda Superb - battery discharges
| Data sheet | |
|---|---|
| Manufacturer | Škoda |
| Vehicle model | Superb (vehicles with diesel particulate filter) |
| Engine | 2.0 TDI |
| Year of manufacture | 2016-2018 |
| Symptoms | Battery is discharged/vehicle does not start |
| Recommended HGS tool/ HELLA Spare Part No. | Relays: 4RA 933 332-451 |
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their work. The information provided on this website is intended for use by suitably qualified personnel only.
Battery discharged, vehicle cannot be started
With the above-mentioned vehicle type, the radiator fan may switch on of its own accord and does not switch off. It is also possible for the radiator fan to be activated after a longer stationary period of over an hour.
The battery is heavily discharged and it is no longer possible to start the engine.
One reason for this fault may be a thermally overloaded relay contact. This overload can cause the relay contact to "stick" and it can then no longer open properly.
If no definite faults have been detected in the periphery of the affected systems during the diagnosis, special attention should be paid to the power supply relay of Terminal 30 (Relay 4RA 933 332-451). This is located in the engine compartment fuse box in slot R5. One way of determining whether the relay contact is really "sticking" in the event of a fault is to tap lightly on the relay.
This can be done, for example, with a screwdriver. Tapping lightly on the affected relay usually opens the relay contacts again. If the contacts are open, the radiator fan also switches off again.
Another option for checking the relay contacts is the performing of a visual inspection. The relay housing can be opened and then the contacts inside checked. If thermal overloads are visible on the relay contact, the relay has to be replaced.
Once the cause of the fault has been removed, delete the error memory and then carry out a test drive.
IMPORTANT
Please always follow the repair instructions from the vehicle manufacturer when carrying out such work.
In certain cases, this information can also apply to other vehicle series.
Example of thermal overload of relay contact
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