CONSTRUCTION
The ECM uses the park/neutral position switch and transmission control switch to detect the shift lever position.
The park/neutral position switch sends P, R, N and D signals to the ECM.
The transmission control switch detects whether the shift lever is in S (S signal), detects the operating conditions of the shift lever "+" (upshift) or "-" (downshift) and sends the SFTU and SFTD signals to the ECM.