DTC P1780: Shift Change Signal: Description

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If DTC P1780 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000, Refer to DTC U1000, U1001: CAN COMMUNICATION LINE . .

ECM receives current gear position signal, next gear position signal, shift change signal, shift pattern signal through CAN communication line from TCM (Transmission control module). ECM uses these four signals for engine control.