Shift Solenoid: Testing and Inspection

4R70E/4R75E

Pinpoint Tests - OSC Equipped Vehicle

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 component as required.

Shift Solenoids Pre-Diagnosis

Use the following shift solenoid operation information when carrying out Pinpoint Test A. Pinpoint Test A: Shift And TCC Solenoids

Solenoid Operation Chart:

a When a manual pull-in occurs above a calibrated speed, the transmission will not 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"

Failed off due to PCM and/or vehicle wiring concerns, shift solenoid electrically or hydraulically stuck off.

*No engine braking.

Shift Solenoid Failure Mode Chart "Always On"

Failed on due to PCM and/or vehicle wiring concerns, shift solenoid electrically or hydraulically stuck on.

*No engine braking.