Pneumatic Supply Pressure
â–¶ How to fix
Compare APS2 pressure value in circuit 21 and circuit 22 with a reference pressure sensor and find out which pressure sensor has the offset. Exchange pressure sensor with identified offset.
What you'll see
No driver-visible symptom recorded.
System reaction
Pressure values from circuit 21 and circuit 22 are still valid on AIR1 message and will still be used to calculate the system pressure.
Diagnostic depth
Detection
Pressure difference out of pressure in circuit 21 and circuit 22 is calculated if the system pressure is above 'PU_MinWrkPrsForChaVlv_absmbar'. If the pressure difference is above 'PU_PrsDiffForSenOffset_mbar' for longer than 'PY_TimThdForSenOffset_ds' the DTC is set.
Possible cause
Pressure sensor offset in circuit 21 or pressure sensor offset in circuit 22