43 Calibration
WM 4300K2 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
- Calibration can only be carried out while the vehicle is stationary.
- The vehicle must stand "floating" on the measuring platform to avoid straining the axles.
- Calibration is also required for the variants with "steel springs - PASM". The headlight beam adjustment (HBA) sensors are also calibrated.
- Prior to calibration, the vehicle must be set to Normal Level.
- Ensure that tyre pressures have been adjusted to the respective tyre specifications. (>>4405IN Wheels and tyres)
- The vehicle is raised and lowered during the height sensor system component test and then adjusts to the correct level.
- The measured values for the vehicle height must correspond approximately to the values specified under Adjustment values for suspension alignment. An implausible value will not be accepted. For the current comparative values for the vehicle height, please refer to the adjustment values for suspension alignment -> 4495TW Adjustment values for suspension alignment 449503 Suspension Alignment, Complete
- Do not interrupt calibration. If calibration is interrupted, the fault code 000286 "Customer service mode not complete" remains stored and is active. A warning appears in the instrument cluster. Select [[]]Completion of height sensor calibration[[ in the Drive links/Tests menu. Erase the fault memory and perform calibration again.
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. -> 43 Calibration (conditions for carrying out calibration)
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. -> 43 Calibration (Adjusting car 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 centre 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.