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Home >> Jeep >> 2020 >> Grand Cherokee Trackhawk >> Repair and Diagnosis >> External Pages >> Different car >> Section 270 (8HP75 Automatic Transmission - DTCS P1D91-00 To U1477-00 - 2500HD & 3500HD) >> DTC Troubleshooting >> P1DAD-00-Input Shaft-Output Shaft Direction Correlation >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of the diagnostic is to detect an unwanted driving direction. A rationality check is performed between the measured directions of input speed and output speed signal and the calculated driving direction. The calculated driving direction is based on the commanded currents of the pressure regulators.

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