Circuit/System Description

The transmission internal mode switch, often referred to as the automatic transmission manual shift shaft position switch, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. The 9 outputs from the switches indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P) are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid/EV powertrain control module 1. The Range input signals are represented as TCM scan tool parameters Internal Mode Switch A, B, C, and P. The Direction input signals are represented as Hybrid Powertrain Control Module scan tool parameters Internal Mode Switch 2 - R1, R2, D1, D2, and S. The input voltage at the modules is high when a switch is open and low when a switch is closed to ground. Each control module independently supplies power and ground to its respective switch assembly.

The hybrid/EV powertrain control module 1 is internal to the power inverter module, often referred to as the drive motor generator power inverter module, and is not serviced separately. The hybrid/EV powertrain control module 1 compares the transmission internal mode switch requested direction to other data to verify that the indicated direction and range switch calculation is correct.