Please consider commerical truck with Magnetic Torque Overlay (MTO) Hydraulic Active Steering System that includes Lane Keep Assist (LKA).
Vehicle experienced a sudden left turn steering problem. It went off to the right side of the roadway. Afterward:
1. There were no active fault codes with the active steering system.
2. During the test drive, the vehicle has a light steering effort.
3. The LKA would only warn when vehicle was departing from it's lane. It wouldn't automatically force vehicle to center of the lane.
4. The power to the MTO steering gear was disconnected to create a steering fault, and then the power was reconnected with the key cycle to correct the fault. Afterwards, steering feel was firmer and when vehicle drifts out of the lane, LKA would force vehicle back into the lane.
5. Steering angle sensor appears to be working properly.
Is this a steering system issue?
What might be the cause of the problem?
How to duplicate this problem?
My theory is that diagnostics in steering ECU are working fine. The cause might be that engineers missed identifying all the faults. Some unidentified fault occurred. ECU software and hardware didn't check for this fault. Therefore, there were not active fault codes. Does this theory make sense?
Vehicle experienced a sudden left turn steering problem. It went off to the right side of the roadway. Afterward:
1. There were no active fault codes with the active steering system.
2. During the test drive, the vehicle has a light steering effort.
3. The LKA would only warn when vehicle was departing from it's lane. It wouldn't automatically force vehicle to center of the lane.
4. The power to the MTO steering gear was disconnected to create a steering fault, and then the power was reconnected with the key cycle to correct the fault. Afterwards, steering feel was firmer and when vehicle drifts out of the lane, LKA would force vehicle back into the lane.
5. Steering angle sensor appears to be working properly.
Is this a steering system issue?
What might be the cause of the problem?
How to duplicate this problem?
My theory is that diagnostics in steering ECU are working fine. The cause might be that engineers missed identifying all the faults. Some unidentified fault occurred. ECU software and hardware didn't check for this fault. Therefore, there were not active fault codes. Does this theory make sense?