EF2 speed sensor output unrealistic frequency falloff
Switch off ignition; Disconnect electronics from transmission; Connect terminal tester between TCU and transmission; Switch on ignition; Measure voltage between pin 10 (EF2) and pin 15 (AU2), nominal value: 5 V; Switch off ignition; Disconnect electronics; Measure resistance between pin 15 (AU2) and ground / housing, nominal value: > 10 Mohm; Measure resistance between pin 10 (EF2) and ground / housing, nominal value: > 10 Mohm; If you find deviations from nominal value, check wiring, component, and TCU;
What you'll see
No driver-visible symptom recorded.
System reaction
Deactivate Neutral Standby;Deactivate Automatic Idle Shift;Switch off engine brake (If available);;;;;;Switch to duty cycle signal Limp Home from Shift Console;EFP restrictions;Switch off Comfort start;short time slip of lock up clutch locks;Permit reverse gear only when braking and reverse from first gear via Neutral on Shift Console (In a certain time and n_Tu=0);Change only into a certain high gear if Neutral -> D is pressed on the Shift Console;
Diagnostic depth
Speed drops to 0 rpm in a few milliseconds The fault can only be detected during driving; Speed > 1000 rpm
Increased fuel consumption; Reduced driving performance; Reduced retarder braking performance;;