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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> 8HP50/850RE - DTCS P1D92-00 To U3002-00 >> DTC Troubleshooting >> P1DB8-00-Unintended Torque Applied While In Neutral >> Theory Of Operation

Theory Of Operation

The purpose of the diagnostic is to detect an unwanted power flow in the transmission. A rationality check of the ratio of input speed to engine speed is done while no power flow is requested.