Suspension Control Pressure Sensor/Switch: Service and Repair

Replacing sensor (ORS)

Preliminary work for replacing sensor

The ORS sensor is located at the center of the off road stabilizer -arrow- on the front and rear axle respectively.

The procedure for replacing the sensor is the same on both the front and rear axle.





Off road stabilizer sensor

Warning:
Risk of accidents! The off road stabilizer System (ORS) operates at an overpressure of up to 165 bar. Under certain conditions, motions can occur on the wheel carrier (e.g. if the off road stabilizers are disengaged when lifting, the button is pressed on the center console, and the wheel carrier is also raised). The anti-roll bar can close quickly.
^ Danger of crushing in the area of the anti-roll bars and wheel carriers. Risk of injury and material damage due to raising the wheel carrier incorrectly.

-> Before working on the vehicle, ensure that the ORS is engaged. The indicator light on the center console button must be OFF. If the indicator light is on, follow the following procedure: Switch on the ignition and engage the road driving program >> High Range >>. The anti-roll bars must engage audibly.

-> Before working on the ORS, always depressurize the system! To do this, connect the PIWIS Tester and select >> Off-road Stabi (ORS) >> Drive links >> Set FA or RA valve >> in the menu. The valve clocks (audibly) until the procedure is finished.

-> Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels). When raising the suspension, use a suitable intermediate layer (hard rubber).

-> Do not damage the brake cover plate.

1. Before starting to work on the off road stabilizer System (ORS), depressurize the system using the PIWIS Tester.
2. Lift the vehicle.
3. Remove engine guard.

Replacing sensor

1. Carefully remove any dirt you see on the sensor's threaded joints (e.g. with a brass wire brush).





Threaded joint on ORS sensor

2. Loosen the plug connection for the sensor line.
3. Loosen the hose clamp and guide the cable through.

Information:
Wear protective gloves and goggles.

Clean the contact surface of the sensor with a lint-free cloth.

Use a new O-ring.

Observe correct tightening torques.

4. Use a suitable collecting container and remove the sensor cover.





O-ring on ORS sensor

5. Fit the O-ring. Ensure that the O-ring is seated correctly -arrow-.
6. Insert the sensor into the sensor cover. Fit the assembly (sensor cover/sensor) -arrows-.





Threaded joint on ORS sensor

7. Fit plug connection for sensor line, clip in cable and fasten the hose clamp.

Subsequent work for replacing sensor

1. Bleed the ORS.
2. Perform a visual check for leaks on the sensor.
3. Fit engine guard.