Fault code: 397 SCANIA

Error identification:

The voltage in the circuit has been above the permitted level.

Cause:

Open circuit in the sensor circuit.

The fault may also be caused by a fault on the voltage supply to those components which share their voltage supply. If a fault is indicated on the oil pressure sensor at the same time, there is probably a fault on the shared internal voltage supply.

Notes:

There is a common voltage supply for the fuel supply pressure sensor, coolant temperature sensor, charge air pressure sensor, charge air temperature sensor and fan speed sensor. If a fault occurs in one of the sensors, the other sensor circuits may be affected.

If the voltage is outside the permitted range, the control unit uses a pre-programmed value.

An active fault code limits the maximum engine torque by approximately 30%.

Action:

Check the fuel supply pressure sensor, coolant temperature sensor, charge air pressure sensor, charge air temperature sensor and fan speed sensor, along with the harness-to-harness connectors and electrical cables in the circuits.