Hydraulic failure detected
Step-1: Check the hydraulic oil-level, pump, pipes, hoses and steering gear. Step-2: Replace or repair the defective parts by referring to the part specific service manuals.
What you'll see
The driver might detect reduction in Assistance/Hard Steering due to loss of hydraulics, that leads to more electrical steering support.
System reaction
Set the Red Lamp to "On." De-activate Active Return functionality. De-activate External Assist Interface functionality. Hint: The functionality Active Lane Assist (EAI) provides an interface for controlling the wheel angle via CAN..
Diagnostic depth
The DTC will set when following condition are met. 1. Calculated vehicle speed > 7kmph. 2. Distance from the SW endstop > 10 mm. 3. Maximum torque at steering gear > 15 Nm. 4. Steering angle speed < 200°/s 5. Limitation of Motor torque > 1 Nm 6.system state: DriveUp. 7.system voltage is above 6v. 8.system voltage is below 42v.
Failure within the hydraulic circuit.