Power Steering System Air Bleeding
Perform air bleeding procedure as necessary after replacing the steering gear or the steering fluid lines.
Required Special Tools:
- MB991955: M.U.T.-III Sub Assembly
- Raise and support the front wheels.
- Disconnect the crank angle sensor connector.CAUTION: Perform air bleeding only while cranking the engine. If air bleeding is performed while the engine is running, air could enter the fluid. During air bleeding, refill the steering fluid supply so that the level never falls below the lower mark on the dipstick.
- Turn the steering wheel all the way to the left and right five or six times while using the starter motor to crank the engine intermittently several times (for 15 to 20 seconds).
- Connect the crank angle sensor connector.
- Start the engine (idling).
- Turn the steering wheel to the left and right until there are no air bubbles in the oil reservoir.
- Confirm that the fluid is not milky, and that the level is between the high and low dipstick marks.
- Confirm that there is very little change in the fluid level when the steering wheel is turned left and right.
CAUTION: If the fluid level rises suddenly after the engine is stopped, the air has not been completely bled. If air bleeding is not complete, there will be abnormal noises from the pump and the flow-control valve, and this condition could cause reduce the life of the power steering components.
- Confirm that the change in the fluid level is no more than 5 mm (0.2 inch) when the engine is stopped and when it is running.
- If the change of the fluid level is 5 mm (0.2 inch) or more, the air has not been completely bled from the system. The air bleeding procedure must be repeated.
- Use the scan tool MB991958, check if the DTC is set. If it is set, erase it.