P1780

DTC P1780 SHIFT CHANGE SIGNAL

Description

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.

On Board Diagnosis Logic:

On Board Diagnosis Logic

DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II
1. Perform DTC confirmation procedure for DTC P1754, refer to "DTC Confirmation Procedure". Testing and Inspection
2. If 1st trip DTC is detected, go to "Diagnostic Procedure". Testing and Inspection

WITH GST
Follow the procedure "WITH CONSULT-II" above.

Diagnostic Procedure (Steps 1 - 2):

Diagnostic Procedure (Step 3):

Diagnostic Procedure