4R70W/4R75W - Automatic Transmission

Pinpoint Tests - OSC Equipped Vehicles

Special Tool(s):

Any time an electrical connector or solenoid body is disconnected, inspect the connector for pin condition, corrosion and contamination. Also inspect the connector seal for damage. Clean, repair or install a new connector or component as required.

Shift Solenoids Pre-Diagnosis
Use the following shift solenoid operation information when carrying out Pinpoint Test A. Test A: Shift and Torque Converter Clutch Solenoids

Solenoid Operation Chart:

a When a manual pull-in occurs above a calibrated speed, the transmission will downshift from the higher gear until the vehicle speed drops below this calibrated speed.

EC = Electronically controlled.
HD = Hydraulically disabled.

Shift Solenoid Failure Mode Chart Always Off

Shift Solenoid Failure Mode Chart Always Off (Part 1):

Shift Solenoid Failure Mode Chart Always Off (Part 2):

Shift Solenoid Failure Mode Chart Always Off (Part 3):

Failed off due to powertrain control module and or vehicle wiring concerns, shift solenoid electrically or hydraulically stuck off.

Shift Solenoid Failure Mode Chart Always On

Shift Solenoid Failure Mode Chart Always On (Part 1):

Shift Solenoid Failure Mode Chart Always On (Part 2):

Shift Solenoid Failure Mode Chart Always On (Part 3):

Failed on due to powertrain control module and or vehicle wiring concerns, shift solenoid electrically or hydraulically stuck on.