Notes on steering troubleshooting | Model 414, 636, 638, 639, 690, 900, 901, 902, 903, 904, 905, 906, 909 | ||
| Check oil level in reservoir; locate leakage if oil level is too low. | ||
| Check whether the sluggishness which is subject of the complaint can be reproduced. | ||
| Check whether the customer is complaining about a series production configuration. Compare with a reference vehicle. | ||
| Model 414, 639 E-CELL, model 639, with ECO pump Check whether the actuation signal (circuit 61) and supply voltage (circuit 30/31) of the electric power steering pump are present. | ||
| Check how the steering force reacts when the steering wheel is turned from the center position to the end stop. | ||
| Is the sluggishness uniform over the entire steering movement, occurs only at certain points or directly before the end stop. | ||
Troubleshooting | |||
Complaint | Possible cause | Notes | Remedy |
General sluggishness when steering | | Especially noticeable at low speeds (< 40 km/h). | |
Steering is harder only for a short time | | An insufficient pump delivery rate can cause the steering to become harder for a short time when the steering wheel is turned quickly. | |
Poor steering wheel return after cornering | | It is not possible to measure the steering wheel return (self-centering characteristics) after cornering, this can only be assessed subjectively (using a comparable vehicle is necessary). | |
Sluggishness when steering | Joints, suspension strut mount, steering column, boot, power steering pump, steering gear | Component-related troubleshooting: General check/assessment of sluggishness, specific check. | |