( TF09E1PK77100091780FAAT00 )

( TF09E1PK77100091780FAAT00 )

DTC Troubleshooting: P1780 (49)

DTC P1780:

Shift Control System (Transmission Default Mode)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information.

Clear the DTC with the HDS.

Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then slow down to a stop.

Check for other DTCs indicated simultaneously with DTC P1780.

NOTE: DTC P1780 means there is one or more A/T DTCs about the shift control system.

Are there other DTCs?

YES	-	Troubleshoot the problem indicated by the DTC.■
NO	-	Go to Step 4 .

Update the A/T software in the PCM if it does not have the latest software, or substitute a known-good PCM.

Test-drive the vehicle with the shift lever in D, and let the transmission shift through all five gears. Then slow down to a stop.

Check for Temporary DTCs or DTCs with the HDS.

Is DTC P1780 indicated?

YES	-	If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to Step 1 .
NO	-	Go to Step 7 .

Monitor the OBD status for P1780 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

Does the HDS indicate PASSED?

YES	-	If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other DTCs were indicated on Step 6 , go to the indicated DTC's troubleshooting.■
NO	-	Check for poor connections and loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to Step 1 . If the HDS indicates NOT COMPLETED, return to Step 5 and recheck.