Shift Solenoid: Description and Operation

Solenoid Operation Chart #701, Part 1 Of 2:

Solenoid Operation Chart #701, Part 2 Of 2:

SOLENOID VALVE BODY ASSEMBLY
The solenoid valve body assembly contains the Transmission Fluid Temperature sensor (TFT) sensor, as well as five Powertrain Control Module (PCM) controlled output devices:
- Electronic Pressure Control (EPC) solenoid
- Shift Solenoid 1(SS1)
- Shift Solenoid 2 (SS2)
- 3-2 Timing/Coast Clutch Solenoid (3-2 T/CCS)
- Torque Converter Clutch (TCC) Solenoid

ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID
The EPC solenoid is a Variable Force Style (VFS) solenoid. The VFS type solenoid is an electro-hydraulic actuator combining a solenoid and a regulating valve. This solenoid provides Electronic Pressure Control (EPC) which regulates Line Pressure (LP) and Line Modulator (LM) pressure. This is controlled by producing a resisting pressure to the main regulator and line modulator circuits. The LP and LM pressures control the clutch application pressures.

TORQUE CONVERTER CLUTCH (TC) SOLENOID
The Torque Converter Clutch (TCC) solenoid is a Pulse Width Modulating (PWM) style solenoid. The PWM solenoid is used to control the apply and release of the bypass clutch in the torque converter. By modulating the pulse width of the TCC solenoid the pressure in the S4 circuit varies modulating the apply and release of the bypass clutch in the torque converter.

3-2 TIMING/COAST CLUTCH SOLENOID (3-2 T/CCS)
The 3-2 T/CCS is a Variable Force Style (VFS) solenoid. The VFS type solenoid is an electro-hydraulic actuator combining a solenoid and a regulating valve. It supplies pressure to the S3 circuit to control the release of the direct clutch and to apply the intermediate and overdrive band during a 3-2 downshift. This solenoid also regulates the pressure in the S3 circuit to control the application and release of the coast clutch.

SHIFT SOLENOID ASSEMBLY (SS1, SS2, SS3)
Shift solenoids 1 and 2 provide gear selection of first through fourth gears by providing ON/OFF pressure control to the shift valves.

Solenoid Operation Chart:

SOLENOID OPERATION
The solenoid operation chart shows normal solenoid operation forgiven operation modes.