Pinpoint Tests - OSC Equipped Vehicles

4R70E/4R75E Automatic Transmission
Pinpoint Tests - OSC Equipped Vehicles

Special Tools:

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:

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" (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.