Quote:
Originally Posted by FencebusterTDI
1. Instant. It is electrical for sure. That assumes it completely cuts out. Usually it does random pulls left and right. I can tell it's electrical because it isn't always consistent and it is intermittent. When the power steering is gone it feels perfectly consistent.
2. I don't have to turn to notice. If I let go of the wheel at 30 it will pull pretty abruptly to the right, or maybe the left, i.e. zero consistency. Sometimes I can turn it hard one way or the other and get strange feedback (like it doesnt pull to the right anymore after I rack it hard to the left).
3. It is either dead with the dash light on, or it has inconsistent feel. I only notice it at the start of a drive. Usually on the highway it's completely gone.
I work with machines ALL day long. I notice when something isn't quite working right. Obvious when it cuts out and throws the dash light, but the frustrating part is when it gives strange pushes and pulls buzzing down the road at 35 before you hit the highway.
Guess I might have to bring it in finally. Will let all know how it goes.
|
The strange pushes & pulls indicate issues with inputs to the PS ecu. I seriously doubt it's the ecu itself. Much more likely is error input or position feedback.
If at a standstill with the engine off you wiggle the steering wheel, you'll notice some left to right play before the wheels start turning. That's the "torque sensor" The control error signal corresponds to how hard you yank on the wheel. The controller responds by driving the servo motor to eliminate the error.
the rotation angle sensor tells the controller just that, the steering angle.
I don't know exactly the logic of the control system but a loose plug or intermittent connection could cause what you describe.
