Applies to: COO6 (COO6C)
What does Scania COO fault code 52 mean?
The signal from one of the pressure switches for the parking brake circuit has been implausible in relation to the vehicle speed. The parking brake circuit has one pressure switch that monitors a high air pressure and one that monitors a low air pressure. This fault applies to the higher pressure.
What causes Scania DTC 52?
The pressure switch indicated that the air pressure in the parking brake circuit has fallen below a specific value and has sent an earthing signal to the coordinator. The signal is interpreted as the parking brake being applied while the vehicle speed has been above 30 km/h. This may be because the pressure switch circuit has been short-circuited to earth.
How does the system react?
The instrument panel indicator lamp for applied parking brake will come on.
How to fix Scania COO fault code 52?
- Check the pressure monitor circuit for shorts and breaks.
- The signal on coordinator pin 77 (on earlier models of coordinator) or on pin A13 (on later models of coordinator) should be low (earthing) only when the parking brake is applied.
This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.