Pneumatic Supply Pressure
â–¶ How to fix
Check Compressor control by external tester activation. Check control line. Check compressor. Exchange or repair faulty part. (compressor, line, protection valve housing or ECU). Erase fault memory.
What you'll see
No driver-visible symptom recorded.
System reaction
The system directly starts to dump the pressure down to a normal level by opening the purge valve and performing a constant regeneration.
Diagnostic depth
Detection
The system pressure is above the parametrized maximum value.
Possible cause
Undetected internal electrical or mechanical fault or external compressor control line failed or compressor control failed in compressor.