P1790

P1790-FAULT IMMEDIATELY AFTER SHIFT

For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


This DTC will only be stored along with a gear ratio DTC. If this DTC is set, it indicates a probable hydraulic (line pressure) or mechanical problem exists. Diagnosing the transmission should be based on the associated speed ratio DTC and mechanical causes should be considered first.


- When Monitored:

After a speed ratio error is stored.

- Set Condition:

This DTC is set if the associated speed ratio DTC is stored within 1.3 seconds after a shift.







Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure before proceeding. 45RFE/545RFE Pre-Diagnostic Troubleshooting Procedure







Diagnostic Test


1. INTENDED GEAR TO APPLIED CLUTCH

With the scan tool, check the DTC EVENT DATA to determine in which gear the slippage occurred and the clutches that were applied.

With the DTC EVENT DATA, use the information provided above to determine the proper symptom for diagnosis.

View repair

Repair

- Refer to the Transmission and Drivetrain to perform the appropriate symptom identified from the DTC EVENT DATA, intended gear, and applied clutches.
- Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. 45RFE/545RFE Transmission Verification Test