EF1_ELECTRIC; Turbine shaft speed; Electrical error
Switch off ignition; Disconnect electronics from transmission; Connect terminal tester between TCU and transmission; Switch on ignition; Measure voltage between pin 2 (EF1) and pin 6 (AU1) Nominal value: 5V; Switch off ignition; Disconnect electronics; Measure resistance between pin 6 (AU1) and ground / housing Nominal value: >10 Mohm; Measure resistance between pin 2 (EF1) 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;Deactivate shifting pressure adaption and use last adaption values;Special closing procedure of lock-up clutch;Special fast procedure to change into Neutral gear;Increase main pressure up to a certain value;Reduced engine torque;Switch to duty cycle signal Limp Home from Shift Console;EFP restrictions;short time slip of lock up clutch locks;
Diagnostic depth
Readback voltage outside valid value; Normal mode
Increased fuel consumption Reduced driving performance;