Scania Pneumatic System Diagram. Air Suspension
A comprehensive guide to the Scania truck air system, focusing on the operation, maintenance and diagnostics of the air suspension system. Includes air line diagrams, component descriptions (valves, receivers, compressors, control units), line routing and step-by-step troubleshooting instructions. The guide will help you understand the operation of the height adjustment, load management and ride stabilisation systems, ensuring confident maintenance and repair.
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Typical problems with Scania air suspension (ECAS):
Failure of height sensors
– Mechanical failure, rusting of joints, loss of contact.
– Result: the car "sags", incorrect height adjustment.
Valve block malfunctions
– Solenoids may freeze or operate with a delay.
– A pressure error may appear or one of the axles may work "crookedly".
Air leaks in pneumatic lines or receivers
– Especially in winter due to freezing of moisture.
– Leads to constant operation of the compressor, overheating.
ECAS control unit failures
– Software freezes, loss of communication with the CAN bus.
– An air suspension error appears on the panel, the suspension goes into emergency mode.
The compressor loses performance
– Piston and valve wear.
– Constant underinflation, pressure errors, slow lifting of the body.
Calibration errors after replacing components
– If fine tuning is not performed via diagnostic software (e.g. SDP3), the suspension may not operate correctly.
❗ Models with an increased number of complaints:
- Scania R 2004–2012
- Scania P with ECAS 2nd generation
- Scania with a steering lift axle (failures in the correct operation of the axles and body distortion occur more often)