Proportional valve D1 (Y20)
â–¶ How to fix
Check the signal to pin 57 in the connector for the gearbox control unit. Check the proportional valve D1 according to the section "Checking solenoid valves and sensors".
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Incorrect signal from proportional valve D1.
Possible cause
The gearbox control unit, pin 57, has detected a short circuit to positive.The voltage has exceeded 7.5 V.