Programming and Relearning

Calibration

Calibration

Calibration must be carried out if control unit and/or self-levelling sensors are replaced. When doing this, the self-levelling sensors are calibrated by determining a correction value (corresponding to the actual height of vehicle) and permanently storing it in the control unit.

Notes on calibration

Information
^ Prior to calibration, the normal level must be adjusted!

^ Ensure that tire pressures have been adjusted to the respective tire specifications.

^ During calibration, the vehicle is raised and lowered!

^ Do not interrupt calibration! If calibration is interrupted, the fault code 1437 "Control position not learned" is entered! The warning message "Air spring defective, workshop" appears in the instrument cluster! If this happens, perform calibration again!

^ When engine is running, switch air extraction system on.

^ The security code is displayed in the Porsche System Tester under menu >> Level adjustment >> Actual values.

The nominal values for the nominal heights of the level sensors are stored in the control unit. The actual values of the respective axle heights, front left, front right, rear left, rear right, have to be measured manually and then entered with the Porsche System Tester. The actual values are to be measured on the two axle supports (front axle, rear axle), both on the right and left.

Measuring point for rear axle

The distance (middle of wheel) between the road (wheel contact area on measuring platform) and the measuring point -A- on the axle support is measured.





Measuring point for front axle

The distance (middle of wheel) between the road (wheel contact area on measuring platform) and the measuring point -A- on the axle support is measured.





Conditions for carrying out calibration

Calibration can only be carried out while vehicle is stationary.

The vehicle must be on the measuring platform.

The foot-operated parking brake is to be operated.

The car is to be adjusted to normal level.

If air suspension accumulators of the air suspension are filled, only the ignition has to be switched on. If air pressure in accumulators is too low, compressor comes on and loads battery. In this case, a constanter (charging unit) must be connected or the engine must be started.

Connect the Porsche System Tester. Select the test step Calibration in the Air suspension/level adjustment system.

When calibrating, the vehicle moves down first and then moves up to normal level.

After normal level has been reached, determine the actual values of axle heights at measuring points.

If an implausible value is entered (actual value is not accepted), measure height again and enter value.

Adjusting car to normal level

Stop the vehicle and apply the brake.

Close vehicle doors.

Tap the right-hand rocker switch on the center console in the appropriate direction until vehicle has reached normal level. The middle indicator light next to the rocker switch is permanently on. If a further indicator light should come on, a different level is set.