Proportional valve D1
â–¶ How to fix
Measure modulation pressure.If the modulation pressure is lower than 4+/-0.3 bar then renew proportional valve D1.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Modulation pressure too low.
Possible cause
Proportional valve D1 defective.