Shift Solenoid: Service and Repair

4R70E/4R75E
Electronic Pressure Control (EPC) Solenoid

Special Tools:

Removal

CAUTION: Do not pull on the molded lead frame. This may cause damage to the connector ends. Carefully pry up on the locking tabs to disconnect the solenoids. Disconnect the molded lead frame from the solenoids.

1. With the vehicle in NEUTRAL, position it on a hoist.
2. Drain transmission fluid and remove the transmission fluid pan and filter.





3. Disconnect the molded lead frame from the solenoids.
1 Disconnect the shift solenoid SSA and SSB.
2 Disconnect the torque converter clutch (TCC).
3 Disconnect the electronic pressure control (EPC) solenoid.
4 Disconnect the bulkhead interconnector.





4. Remove the EPC solenoid.

Installation





1. NOTE: Lubricate the EPC solenoid O-rings with clean automatic transmission fluid.

Install the EPC solenoid, bracket and bolt.
^ Tighten to 10 Nm (89 inch lbs.).





2. Inspect the lead frame for damage.
^ Using the special tool, check all lead frame solenoid connections. The gauge should fit tightly and not fall out after being inserted.
^ If the special tool passes through any lead frame connector pins or does not feel like it makes a good contact,
^ Install a new lead frame.





3. Connect the molded lead frame to the solenoids.
1 Connect the shift solenoid SSA and SSB by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
2 Connect the TCC by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
3 Connect the EPC solenoid by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
4 Connect the bulkhead interconnector by pressing it in place by hand and fully seating the connector in place.
4. Install the transmission fluid pan and filter.