Implausible Pressure Control (TCV) / Pressure Too Low
â–¶ How to fix
- Check, if the supply pressure sensing (circuit 3) is correct - Check the pneumatic lines to the coupling-heads (leaky ?) - Check the pneumatic supply line to the TCV (blocked, kinked ?) - Replace TCV (internal valves or sensor might be faulty)
What you'll see
Warning on dashboard / Vehicle behaviour might be changed
System reaction
- ABS still available - ESC-function switched off - el.pn. pressurecontrol at TCV is switched off
Diagnostic depth
Detection
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Possible cause
- Incorrect supply pressure sensing (circuit 3) - Leaky pneumatic lines to the coupling-heads - blocked pneumatic supply line to the TCV - faulty TCV (defective internal valves or sensor)