Delphi has supplied this step-by-step guide on calibrating air suspension courtesy of its Masters of Motion hub for independent garage technicians.
Air suspension brings many benefits for drivers and passengers including the reduction of noise, vibration and discomfort. However, like many in-vehicle systems calibration is needed from time to time, particularly when a part is replaced.
This guide takes you through the steps needed to calibrate the air suspension on a BMW X5. Some air suspension systems feature air springs front and rear, or have a combination of coil springs and air springs.
Calibration is required following an air spring or height sensor replacement. Some vehicles will only require a static height calibration which can be completed in the workshop. Others will need a static calibration in the workshop and a dynamic calibration performed whilst the vehicle is being driven on the road. This guide sees Phil Mitchell, european workshop solutions manager at Delphi, talk us through the process at Delphi’s in-house training workshop in Warwick.
Step 1
Fill the bellows
To ensure the air system is refilled after completing a replacement job on an air spring or height sensor, technicians must run a ‘filling the bellows’ ‘diagnostic function in the ‘electronic height control’ module using the Delphi BlueTech VCI diagnostic tool.
Step 2
Navigate to ‘height level adjustment’
In the ‘body control’ module, go to ‘adaptations and calibrations’ and run the ‘height level adjustment’ function. Delphi’s diagnostic software outlines the necessary test conditions needed to successfully complete the process. Technicians should follow the manufacturer’s instructions, ensuring that the vehicle is on level ground, the steering wheel is straight, and the tyre pressure is correct. The vehicle’s load must remain constant during calibration – any movement will disrupt the calibration.
Step 3
Calibrate air suspension
With battery support connected to the vehicle, confirm that the final checks have been made and that the vehicle is ready before performing the calibration.
