Axle Modulator 1B / Implausible Pressure Control (Circuit A) / Pressure Too Low
â–¶ How to fix
- Check the supply pressure of the axlemodulator (supply sensing correct ?) - Check the pneumatic supply line (left channel) of the axle-modulator (blocked ? kinked ?) - Check the pneumatic brake line (left channel) of the axle-modulator (broken ? leaky ?) - Replace the axle-modulator
What you'll see
Warning on dashboard / Vehicle behaviour might be changed
System reaction
- ABS partly or completely switched off - ESC-function switched off - el.pn. pressurecontrol is switched off at relevant axle(s)
Diagnostic depth
Detection
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Possible cause
- Faulty Supply Pressure Sensing - Left supply line blocked - Left brake line leaky - Faulty Axlemodulator